ENGINEERING | TECHNOLOGY

Virtual Keyboard

noreply@blogger.com (Neil Abapo) — Fri, 30 Nov 2012 00:19:00 +0000

Celluon Magic Cube Virtual Keyboard
Celluon MAGICCUBE

Product Description

The Magic Cube is a compact and versatile product; it is a projection keyboard and multi-touch mouse, all in one easy-to-use product. It connects easily to any Bluetooth HID devices, including the latest iPhone, iPad and Android devices. You can also plug-n-play with Windows and Mac OS devices via USB connection.With just a single flick of a switch, the Magic Cube is ready to pair wirelessly with your mobile device.It fits easily in your pocket and it is perfect for on the go. You'll be sure to turn heads the moment you start typing on the Magic Cube.Compatible OS: iOS 4 and later, Mac OS 10 and later, Android 2.2 and later, Windows XP/Vista/7 and later, and any device with Bluetooth HID support.

CLICK HERE FOR MORE DETAILS

Technical Details

Brand Name: Celluon
Model: CellMC1
Weight: 250.0 grams
Item Package Quantity: 1

Product Dimensions: 1.5 x 1.1 x 2.9 inches ; 3.4 ounces
Shipping Weight: 20 pounds
ASIN: B0056KW50C
Item model number: CellMC1

ORDER NOW - Celluon Magic Cube Virtual Keyboard - Celluon MAGICCUBE

T-Mobile Prism

noreply@blogger.com (Neil Abapo) — Thu, 15 Nov 2012 08:07:00 +0000

T-Mobile Prism for T-Mobile (free)

The new T-Mobile Prism Promo:

Free T-Mobile Prism Charcoal Grey Device with a new T-Mobile account.
Free Standard Shipping via FedEx.
Free Secure Contact Transfer & Backup. (Transfer Your Phone List With Ease).
Free Get up to $100 Cash Back - Wirefly Trade-ins.

Specifications:

Powered by Android 2.3 Gingerbread and featuring a 3.5-inch touch screen with a virtual QWERTY keyboard and Swype, the T-Mobile Prism smartphone lets you easily surf the Web, access your favorite social networking sites, and choose from thousands of applications to download from Google Play.

CLICK HERE TO AVAIL THE FREE T-MOBILE PRISM DEVICE

Samsung Galaxy Nexus for Verizon

noreply@blogger.com (Neil Abapo) — Thu, 15 Nov 2012 07:49:00 +0000

Galaxy Nexus by Samsung - 4G LTE for Verizon Wireless for only $29.99

Looking for samsung galaxy nexus for verizon?

Well here is what your looking for.

Wirefly is offering Samsung Galaxy for Verizon Wireless:

Galaxy Nexus by Samsung - 4G LTE with a new Verizon Wireless account for $29.99.
Free standard shipping via FedEx.
Free Secure Contact Transfer & Backup. (Transfer Your Phone List With Ease).
Free Samsung Multimedia Dock.
Get up to $100 Cash Back - Wirefly Trade-ins.
Get Internet Anywhere For All Your WiFi Devices For Only $20 A Month.

Specifications:

The Galaxy Nexus for Verizon Wireless is the first handset to offer the Android 4.0 "Ice Cream Sandwich" platform, giving you more flexibility to express yourself than ever before. Featuring the first HD Super AMOLED screen, the Galaxy Nexus delivers extreme color and clarity on a huge 4.65 inch touch screen.

CLICK HERE TO AVAIL THIS OFFER

Auto Parts

noreply@blogger.com (Neil Abapo) — Sat, 22 Sep 2012 22:35:00 +0000

Jaredzone.info offers Auto Parts Technology Online thru the Auto Parts Warehouse. Auto Parts Warehouse is the leading auto parts and accessories available online. Established last 1995 until now.

Covered around 550,000 auto parts and accessories from the leading aftermarket manufacturers to avail all local and national models. They offers products at discounted prices. Up to 10% discounts on regular retail prices.

They let costumers to budget offers that you wont able to find anywhere else.

Auto Parts Warehouse priority is customer satisfaction, not only sell parts at discounted rates. Also delivers faster than ever to your garage. They make sure your orders are well processed and delivered right away to anywhere especially in the US.

Auto parts also giving away auto parts discounts, promos and coupon codes. And the most great offers is the Free Shipping on orders worth $50 and up which is the best offers so far in auto parts and accessories online.

Auto Parts Warehouse also offers International Shipping. So you can avail the promo and discounts outside the US.

American Pipe Threads

noreply@blogger.com (Neil Abapo) — Tue, 06 Mar 2012 05:06:00 +0000

American National Standard Pipe Threads

American National Standard pipe threads described in the following paragraphs provide taper and straight pipe threads for use in various combinations and with certain modifications to meet these specific needs.

Thread Designation and Notation.—American National Standard Pipe Threads are designated by specifying in sequence the nominal size, number of threads per inch, and the symbols for the thread series and form, as: 3⁄8—18 NPT. The symbol designations are as follows: NPT—American National Standard Taper Pipe Thread; NPTR—American National Standard Taper Pipe Thread for Railing Joints; NPSC—American National Standard Straight Pipe Thread for Couplings; NPSM—American National Standard Straight Pipe Thread for Free-fitting Mechanical Joints; NPSL—American National Standard Straight Pipe Thread for Loose-fitting Mechanical Joints with Locknuts; and NPSH— American National Standard Straight Pipe Thread for Hose Couplings.

American National Standard Taper Pipe Threads.—The basic dimensions of the ANSI Standard taper pipe thread are given in Table 1a.

Form of Thread: The angle between the sides of the thread is 60 degrees when measured in an axial plane, and the line bisecting this angle is perpendicular to the axis. The depth of the truncated thread is based on factors entering into the manufacture of cutting tools and the making of tight joints and is given by the formulas in Table 1a or the data in Table 2 obtained from these formulas. Although the standard shows flat surfaces at the crest and root of the thread, some rounding may occur in commercial practice, and it is intended that the pipe threads of product shall be acceptable when crest and root of the tools or chasers lie within the limits shown in Table 2.

Pitch Diameter Formulas: In the following formulas, which apply to the ANSI Standard taper pipe thread, E0 = pitch diameter at end of pipe; E1 = pitch diameter at the large end of the internal thread and at the gaging notch; D = outside diameter of pipe; L1 = length of hand-tight or normal engagement between external and internal threads; L2 = basic length of effective external taper thread; and p = pitch = 1 ÷ number of threads per inch.

E0 = D – (0.05D + 1.1)p

E1 = E0 + 0.0625L1

Thread Length: The formula for L2 determines the length of the effective thread and includes approximately two usable threads that are slightly imperfect at the crest. The normal length of engagement, L1, between external and internal taper threads, when assembled by hand, is controlled by the use of the gages.

L2 = (0.80D + 6.8)p

Taper: The taper of the thread is 1 in 16, or 0.75 inch per foot, measured on the diameter

and along the axis. The corresponding half-angle of taper or angle with the center line is 1
degree, 47 minutes.

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Other Engineering Topic:

Standard Steel Shapes

Material Densities

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Standard Steel Shapes

noreply@blogger.com (Neil Abapo) — Thu, 12 Jan 2012 08:28:00 +0000

CHANNEL BAR
ASTM A276/484
Hot rolled annealed pickled finish and cold formed.
Lengths are in standard 6.0 meter.

METRIC CHANNEL BARS SIZES and WEIGHT
Thickness (mm)	Web (mm)	Leg (mm)	Kg per meter
3	40	20	1.61
3	50	25	2.09
5	80	40	5.53
6	100	50	8.34
6	130	65	11.19
6	150	75	13.08
10	200	100	28.44

ANGULARBAR | ANGLE BAR

Manufactured to ASTM A276/484.

Hot Rolled Annealed and Pickled finish.

Ranges in thicknesses from 3mm to 10mm.

Lengths are a standard 6.0 meters.

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
3	20 x 20	0.9
3	25 x 25	1.15
3	30 x 30	1.4
3	40 x 40	1.85
3	50 x 50	2.45

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
4	25 x 25	1.48
4	30 x 30	1.8
4	40 x 40	2.45

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
5	25 x 25	1.8
5	30 x 30	2.2
5	40 x 40	3
5	50 x 50	3.8

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
6	25 x 25	2.2
6	30 x 30	2.9
6	40 x 40	3.55
6	50 x 50	4.5
6	65 x 65	5.95
6	75 x 75	7
6	100 x 100	9.9

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
8	50 x 50	6
8	65 x 65	7.87
8	75 x 75	9.3

METRIC ANGULAR BARS SIZES and WEIGHT
Thickness (mm)	Size (mm)	Kg per meter
10	75 x 75	11.2
10	100 x 100	16.2

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Xbox 360 Console

noreply@blogger.com (Neil Abapo) — Wed, 30 Nov 2011 03:12:00 +0000

Xbox 360 Console

DESCRIPTION

Xbox 360 has more ways to play, and now for a limited time get two free games and a 3 Month Xbox LIVE Gold Membership. With the largest portfolio of games to choose from, there’s something for everyone — from classic titles to the biggest blockbuster games. The spacious 250GB hard drive gives you the space you need to store arcade games, movies, demos, and even full Xbox 360 games. Plus, with built-in Wi-Fi, it’s easy to connect to Xbox LIVE to access tons of great entertainment — from HD movies and TV shows to live sports.

FEATURES

Xbox 360 S Console: The Xbox 360 S console runs whisper quiet, letting you play games and watch movies without interference. Easily connect to Xbox LIVE, play with friends all over the world and experience a world of entertainment.

Fable 3:Fable III is the next blockbuster installment in the highly praised Fable franchise. Lead a revolution to take control of Albion, fight alongside your people, and experience love and loss while preparing to defend the kingdom against a looming threat. Your choices as ruler will lead to consequences felt across the entire land. Rated “M” for Mature.

Halo Reach: Join Noble Team on a crucial mission through our darkest hours to ensure the continuation of the human race. With the courage and sacrifice of a Spartan, it's up to you to make sure humanity’s first stand is not our last. Full game downloadable token. Rated “M” for Mature.

Xbox 360 250GB Hard Drive: The 250GB hard drive allows you to save your games and store television shows, movies, music, pictures, trailers, levels, demos and other content available from Xbox LIVE Marketplace.

Xbox 360 Wireless Controller: This award-winning, high-performance wireless controller features the Xbox Guide Button for quick, in-game access to friends and music. It has a range of up to 30 feet and a battery life of up to 30 hours on two AA batteries.

Xbox 360 Headset: Strategize or trade taunts while playing games, and chat with your friends on Xbox LIVE.

MORE DETAILS OF XBOX 360 CONSOLE BUNDLE: CLICK HERE

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Urban Mining

noreply@blogger.com (Neil Abapo) — Tue, 29 Nov 2011 23:12:00 +0000

Urban Mining : How to Recycle Precious Metals Gold and Silver from Electronic Waste [Kindle Edition]

Urban Mining so people call it, this is a business about recycling precious metals gold and silver from electronic waste/e-waste,...and GOLD and SILVER results obtained so amazing, kilograms of gold and silver produced from electronic waste such as computers, cellular phones, SIM Card .. Etc.

In Japan, Eco-System.Co produce gold bars weighing 199.58 - 299.37 KG per month with a value of money earned between U.S. $ 5.9 million - U.S. $ 8.8 Million Dollars from e-waste recycle. This amount is certainly not with silver is also produced.

In this book we are explain about methodes to get more grams of gold and silver from e-waste (electronic waste). With the best formula and more than 180 photos instruction (full colour) you will quick learn how to get more grams of gold and silver from e-waste at your Home. Special offer for a High Profit Business. GUARANTEE

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Urban Mining : How to Recycle Precious Metals Gold and Silver from Electronic Waste
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Alienware m17x10-1847DSB 17‐Inch Gaming Laptop

noreply@blogger.com (Neil Abapo) — Wed, 23 Nov 2011 14:40:00 +0000

The Alienware M17x is the most powerful 17‐inch gaming notebook in the universe. With technology that includes a quad-core processor and next generation NVIDIA dual graphics solutions, gamers will enjoy an incredible gaming experience. Combine this power with the bold anodized aluminum case design and the M17x is a gaming notebook that any gamer would love to own.

Product Details
Color: Space Black
Brand: Alienware
Model: m17x10-1847DSB
Dimensions: 17.38" h x 19.88" w x 9.63" l, 22.00 pounds
CPU: Intel Core i7 1.73 Hz
Memory: 6GB
Hard Disk: 500GB
Battery type: Lithium Ion
Display size: 17

Features
Intel Core i7-740QM 1.73GHz, 2.93GHz Turbo Mode, 6MB Cache
6GB Dual Channel DDR3 at 1333MHz (2 DIMMs); USB 2.0 (4) eSATA/USB 2.0 Combo (2-in-1 Port) with PowerShare DisplayPort, HDMI?, VGA Audio-out Connectors (3) Audio-in/Microphone Jack Built-in Front Speakers (2) Gigabit Ethernet
500GB (7200 RPM) Hard Drive; 8x Slot-Loading CD/DVD Burner (DVD+/-RW)
CrossFireX 1GB ATI Mobility Radeon HD 5870 Graphics; 17"(1440 x 900)Widescreen
McAfee SecurityCenter with anti-virus, anti-spyware, firewall, 6 Months; Steam gaming portal.

Read More PRODUCT DETAILS HERE
or
Buy it from AMAZON

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The Physics

noreply@blogger.com (Neil Abapo) — Tue, 19 Jul 2011 15:28:00 +0000

Building on the research-proven instructional techniques introduced in Knights Physics for Scientists and Engineers, the most widely adopted new physics text in more than 30 years, College Physics: A Strategic Approach set a new standard for algebra-based introductory physics gaining widespread critical acclaim from professors and students alike.

For the Second Edition, Randy Knight, Brian Jones, and Stuart Field continue to apply the best results from educational research, and refine and tailor them for this course and the particular needs of its students. New pedagogical features (Chapter Previews, Integrated Examples, and Part Summary problems) and fine-tuned and streamlined content take the hallmarks of the First Edition exceptionally effective conceptual explanation and problem-solving instruction to a new level. More than any other book, College Physics leads students to proficient and long-lasting problem-solving skills, a deeper and better-connected understanding of the concepts, and a broader picture of the relevance of physics to their chosen career and the world around them.

Read more details on COLLEGE PHYSICS

CRC Handbook of Chemistry and Physics

noreply@blogger.com (Neil Abapo) — Tue, 19 Jul 2011 14:09:00 +0000

CRC Handbook of Chemistry and Physics

The Handbook of Chemistry and Physics has always provided a thorough range of critically evaluated data in a convenient, one-volume format. Over the last 10 years, revisions to the book have supported the advances in semiconductors and high-temperature superconductors; addressed environmental concerns by providing data on pollutants, contaminants, global warming, and ground water contamination; and amended pertinent data to stay current with IUPAC standards. In the last several years, the handbook has added, revised, or updated 95% of its information.

By David R. Lide - Taylor & Francis (99) - Hardback - ISBN 10 0849304806 - ISBN 13 9780849304804

Read more details on CRC Handbook of Chemistry and Physics

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Machinery's Handbook

noreply@blogger.com (Neil Abapo) — Wed, 29 Jun 2011 04:31:00 +0000

Machinery's Handbook 28th Edition Toolbox -Text Only

Celebrating nearly 100 years as "The Bible of the Mechanical Industries", the 28th edition brings together volumes of knowledge, information and data gathered, revised and improved upon from experts throughout the mechanical industries. Extraordinarily comprehensive yet easy to use since it premiered, Machinery's Handbook provides mechanical and manufacturing engineers, designers, draftsmen, toolmakers, and machinists with a broad range material, from the very basic to the more advanced. It has always, and continues to provide industry fundamentals and standards while it moves into the 21st century with material reflecting technological advances and offering vast editorial improvements, making the 28th Edition the best tool . . . ever!

By Oberg, Jones, Ryffel, McCauley and Heald Eds. - Industrial Press, Inc. (00) - Paperback - ISBN 10 0831128003 - ISBN 13 9780831128005

Read more on: Machinery's Handbook 28th Edition Toolbox -Text Only
Machinery's Handbook 28th Edition (Large Print)

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Marks' Standard Handbook For Mechanical Engineers

noreply@blogger.com (Neil Abapo) — Tue, 28 Jun 2011 15:36:00 +0000

Solve any mechanical engineering problem quickly and easily with the world's leading engineering handbook

Nearly 1800 pages of mechanical engineering facts, figures, standards, and practices, 2000 illustrations, and 900 tables clarifying important mathematical and engineering principle, and the collective wisdom of 160 experts help you answer any analytical, design, and application question you will ever have.

By Eugene A. Avallone, Theodore Baumeister and Ali Sadegh - McGraw-Hill Publishing Company (00) - Hardback - ISBN 10 0071428674 - ISBN 13 9780071428675

See more on: Marks' Standard Handbook For Mechanical Engineers

TABLE OF CONTENTS
CONTRIBUTORS
THE EDITORS
PREFACE TO THE ELEVENTH EDITION
PREFACE TO THE FIRST EDITION
SYMBOLS AND ABBREVIATIONS
Chapter 1: Mathematical Tables and Measuring Units
Chapter 2: Mathematics
Chapter 3: Mechanics of Solids and Fluids
Chapter 4: Heat
Chapter 5: Strength of Materials
Chapter 6: Materials of Engineering
Chapter 7: Fuels and Furnaces
Chapter 8: Machine Elements
Chapter 9: Power Generation
Chapter 10: Materials Handling
Chapter 11: Transportation
Chapter 12: Building Construction and Equipment
Chapter 13: Manufacturing Processes
Chapter 14: Fans, Pumps, and Compressors
Chapter 15: Electrical and Electronics Engineering
Chapter 16: Instruments and Controls
Chapter 17: Industrial Engineering
Chapter 18: The Regulatory Environment
Chapter 19: Refrigeration, Cryogenics, and Optics
Chapter 20: Emerging Technologies

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RIVET AND RIVETED JOINTS

noreply@blogger.com (Neil Abapo) — Sun, 26 Jun 2011 05:34:00 +0000

Classes and Types of Riveted Joints

Riveted joints may be classified by application as: 1) pressure vessel; 2) structural; and 3) machine member.

For information and data concerning joints for pressure vessels such as boilers, reference should be made to standard sources such as the ASME Boiler Code. The following sections will cover only structural and machine-member riveted joints.

Basically there are two kinds of riveted joints, the lap-joint and the butt-joint. In the ordinary lap-joint, the plates overlap each other and are held together by one or more rows of rivets. In the butt-joint, the plates being joined are in the same plane and are joined by means of a cover plate or butt strap, which is riveted to both plates by one or more rows of rivets. The term single riveting means one row of rivets in a lap-joint or one row on each side of a butt-joint; double riveting means two rows of rivets in a lap-joint or two rows on
each side of the joint in butt riveting. Joints are also triple and quadruple riveted. Lap-joints may also be made with inside or outside cover plates.

General Design Considerations for Riveted Joints

Factors to be considered in the design or specification of a riveted joint are: type of joint; spacing of rivets; type and size of rivet; type and size of hole; and rivet material.

Spacing of Rivets : The spacing between rivet centers is called pitch and between row center lines, back pitch or transverse pitch. The distance between centers of rivets nearest each other in adjacent rows is called diagonal pitch. The distance from the edge of the plate to the center line of the nearest row of rivets is called margin.

Size and Type of Rivets : The rivet diameter d commonly falls between d = 1.2 t and d = 1.4 t, where t is the thickness of the plate. Dimensions for various types of American Standard large (1⁄2-inch diameter and up) rivets and small solid rivets are shown in tables that follow. It may be noted that countersunk heads are not as strong as other types.

Size and Type of Hole : Rivet holes may be punched, punched and reamed, or drilled. Rivet holes are usually made 1⁄16 inch larger in diameter than the nominal diameter of the rivet although in some classes of work in which the rivet is driven cold, as in automatic machine riveting, the holes are reamed to provide minimum clearance so that the rivet fills the hole completely.

Rivet Material : Rivets for structural and machine-member purposes are usually made of wrought iron or soft steel, but for aircraft and other applications where light weight or resistance to corrosion is important, copper, aluminum alloy, Monel, Inconel, etc., may be used as rivet material.

Simplified Design Assumptions : In the design of riveted joints, a simplified treatment is frequently used in which the following assumptions are made:

1) The load is carried equally by the rivets.
2) No combined stresses act on a rivet to cause failure.
3) The shearing stress in a rivet is uniform across the cross-section under question.
4) The load that would cause failure in single shear would have to be doubled to cause failure in double shear.
5) The bearing stress of rivet and plate is distributed equally over the projected area of the rivet.
6) The tensile stress is uniform in the section of metal between the rivets.

Formulas for Riveted Joint Design
A riveted joint may fail by shearing through the rivets (single or double shear), crushing the rivets, tearing the plate between the rivets, crushing the plate or by a combination of two or more of the foregoing causes. Rivets placed too close to the edge of the plate may tear or shear the plate out to the edge but this type of failure is avoided by placing the center of the rivet 1.5 times the rivet diameter away from the edge.

In the following formulas, let
d=diameter of holes; t =thickness of plate; tc =thickness of cover plates; p=pitch of inner row of rivets; P=pitch of outer row of rivets; Ss = shear stress for rivets; St =tensile stress for plates; Sc =compressive or bearing stress for rivets or plates.

Perry's Chemical Engineers' Handbook

noreply@blogger.com (Neil Abapo) — Tue, 21 Jun 2011 11:06:00 +0000

Perry's Chemical Engineers' Handbook 8th Edition

The field's definitive reference for morethan half a century-updated for the firsttime in more than a decade Since 1934,Perry's Chemical Engineer's Handbookhasdelivered unrivaled, state-of-the-art coverage of allaspects of chemical engineering-from the fundamentalsto details on computer applications and control.Featuring 2,400 pages and 700 illustrations, the eighthedition is a comprehensive source for the newestdevelopments, advances, achievements, and methods inthe field.

See more: Perry's Chemical Engineers' Handbook 8th Edition

Perry's Chemical Engineers' Handbook , 7th Edition

Certain to take its place as the most comprehensive and authoritative reference source available to chemical engineers, this up-to-date guide retains the broad coverage of all classical engineering topics and provides information on principles, design and equipment plus data essential for performing calculations and solving design problems. It also offers new coverage of waste treatment and biochemical engineering, and other modern topics.
Sales of over 139,000 copies of the previous edition confirm this source as the leading chemical engineering handbook. This seventh edition is completely updated and includes new topics such as biochemical engineering, waste management, plant safety, analysis of plant performance, and handling of hazardous materials.
This is a major revision of the definitive handbook in the field of chemical engineering. It provides facts, figures, methods and data needed for solving the wide range of problems engineers face in the chemical process industries. In addition to necessary updating, revising and reorganization throughout, the Seventh Edition will include new material on biochemical engineering, waste management, plant safety and analysis of plant performance, computer applications, expert systems, material and energy balances, gas- and liquid-phase pulsation dampeners, the LIST reactor, and handling of hazardous materials. SI units of measure are used throughout.

See more: Perry's Chemical Engineers' Handbook 7th Edition

Engineering Materials

noreply@blogger.com (Neil Abapo) — Sun, 19 Jun 2011 14:20:00 +0000

Engineering Materials: Properties and Selection

Covering all important classes of materials and manufacturing processes,Engineering Materials9e teaches students why materials fail, and how to select materials which will not. Drawing on the authors 66 years of combined author experience, this book teaches students how to build a repertoire of materials suitable for most engineering applications, and how to properly specify the materials on engineering drawings. Changes to this book Revised and fully-up-to-date Every chapter covers current global industry trends Environmental aspects of materials are presented throughout Covers the basic concepts of nanomaterial technology New and more questions at the end of every chapter ''This book is ideal for the Engineering Technology market. The focus is on real applications of engineering materials with just enough science background to make the subject understandable. In addition to classroom use, this text is useful as a practical reference for the engineering practitioner. '' --Beth Carle, Rochester Institute of Technology

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Introduction to Engineering Materials

Completely revised and updated, Introduction to Engineering Materials, Second Edition elucidates the fundamental science behind the classification of materials and their property limits in terms of temperature, strength, ductility, corrosion, and physical behavior, while emphasizing materials processing, selection, and property measurement methods. The book presents a balanced overview of the theoretical-scientific and practical-technical aspects of materials engineering. It discusses atomic structure and bonds, imperfections in crystalline materials, ceramics, polymers, composites, electronic materials, environmental degradation, materials selection, and more.

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Encyclopedic Dictionary of Gears and Gearing

noreply@blogger.com (Neil Abapo) — Sun, 12 Jun 2011 12:37:00 +0000

Introducing: Encyclopedic Dictionary of Gears and Gearing

The A-to-Z's of gears and gearing, this book is an encyclopedic approach to the topic, intended for use as a quick reference for engineers involved in the design, selection, maintenance, lubrication, troubleshooting, testing and inspection (quality control), and applications of gears, gear drives and their related components. Illustrated.

By South - McGraw-Hill Publishing Company (99) - Hardback - ISBN 10 0070597960 - ISBN 13 9780070597969

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Wastewater Engineering : Treatment and Reuse

noreply@blogger.com (Neil Abapo) — Wed, 11 May 2011 04:48:00 +0000

Introducing:

Wastewater Engineering: Treatment and Reuse, 4/e is an update of McGraw-Hill's popular book on wastewater treatment for civil and environmental engineering majors.

Theory and design issues are now integrated in the chapters on physical, chemical, and biological operations and processes. Combining this material presents a more unified approach to the subjects, and eliminates redundancies that appeared in the third edition. Chapters covering the theory and design of biological treatment systems have been expanded significantly.

SI units are now the lead units, reflecting the global approach to wastewater engineering as it is taught in universities and presented in technical journals. This change addresses the volume of work being done by US consultants overseas, and supports the needs of engineering professionals outside the US for a comprehensive reference source.

This edition retains the strengths of the previous edition by including many data tables. Data tables have been thoroughly updated, and approximately 40 new data tables have been added. Several new design examples have been added, reflecting the technological changes in process design that have occurred. Many new photos of facilities and equipment are included as well.

This is the bible of wastewater engineering. No civil or environmental engineering majors or environmental engineering professional should be without this book on his or her shelf.

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Shigley's Mechanical Engineering Design

noreply@blogger.com (Neil Abapo) — Sun, 01 May 2011 05:08:00 +0000

Introducing:

Shigley's Mechanical Engineering Design has been the standard in machine design for over 50 years, and now with a 40% revision of problems in the 9th edition, instructors will have a variety of new problems to assign at all levels of difficulty.The ninth edition ofShigley's Mechanical Engineering Designmaintains the approach that has made this book the standard in machine design for over 50 years. It combines the straightforward focus on fundamentals that instructors have come to expect, with a modern emphasis on design and new applications.

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Materials Science and Engineering : An Introduction

noreply@blogger.com (Neil Abapo) — Sun, 01 May 2011 04:42:00 +0000

Introducing:

Building on the success of previous editions, this book continues to provide engineers with a strong understanding of the three primary types of materials and composites, as well as the relationships that exist between the structural elements of materials and their properties. The relationships among processing, structure, properties, and performance components for steels, glass-ceramics, polymer fibers, and silicon semiconductors are explored throughout the chapters. The discussion of the construction of crystallographic directions in hexagonal unit cells is expanded. At the end of each chapter, engineers will also find revised summaries and new equation summaries to reexamine key concepts.

See more: Materials Science and Engineering : An Introduction

Gears and Gearing Definitions

noreply@blogger.com (Neil Abapo) — Wed, 16 Mar 2011 04:27:00 +0000

Gears and Gearing

External spur gears are cylindrical gears with straight teeth cut parallel to the axes. Gears

transmit drive between parallel shafts. Tooth loads produce no axial thrust. Excellent at

moderate speeds but tend to be noisy at high speeds. Shafts rotate in opposite directions.

Internal spur gears provide compact drive arrangements for transmitting motion

between parallel shafts rotating in the same direction.

Helical gears are cylindrical gears with teeth cut at an angle to the axes. Provides drive

between shafts rotating in opposite directions, with superior load carrying capacity and

quietness than spur gears. Tooth loads produce axial thrust.

Crossed helical gears are helical gears that mesh together on non-parallel axes.

Straight bevel gears have teeth that are radial toward the apex and are of conical form.

Designed to operate on intersecting axes, bevel gears are used to connect two shafts on

intersecting axes. The angle between the shafts equals the angle between the two axes of

the meshing teeth. End thrust developed under load tends to separate the gears.

Spiral bevel gears have curved oblique teeth that contact each other smoothly and gradually

from one end of a tooth to the other. Meshing is similar to that of straight bevel gears

but is smoother and quieter in use. Left hand spiral teeth incline away from the axis in an

anti-clockwise direction looking on small end of pinion or face of gear, right-hand teeth

incline away from axis in clockwise direction. The hand of spiral of the pinion is always

opposite to that of the gear and is used to identify the hand of the gear pair. Used to connect

two shafts on intersecting axes as with straight bevel gears. The spiral angle does not affect

the smoothness and quietness of operation or the efficiency but does affect the direction of

the thrust loads created. A left-hand spiral pinion driving clockwise when viewed from the

large end of the pinion creates an axial thrust that tends to move the pinion out of mesh.

Zerol bevel gears have curved teeth lying in the same general direction as straight bevel

teeth but should be considered to be spiral bevel gears with zero spiral angle.

Hypoid bevel gears are a cross between spiral bevel gears and worm gears. The axes of

hypoid bevel gears are non-intersecting and non-parallel. The distance between the axes is

called the offset. The offset permits higher ratios of reduction than is practicable with other

bevel gears. Hypoid bevel gears have curved oblique teeth on which contact begins gradually

and continues smoothly from one end of the tooth to the other.

Worm gears are used to transmit motion between shafts at right angles, that do not lie in a

common plane and sometimes to connect shafts at other angles. Worm gears have line

tooth contact and are used for power transmission, but the higher the ratio the lower the

efficiency.

Definitions of Gear Terms

Active face width is the dimension of the tooth face width that makes contact with a mating
gear.

Addendum is the radial or perpendicular distance between the pitch circle and the top of the
tooth.

Arc of action is the arc of the pitch circle through which a tooth travels from the first point
of contact with the mating tooth to the point where contact ceases.

Arc of approach is the arc of the pitch circle through which a tooth travels from the first
point of contact with the mating tooth to the pitch point.

Arc of recession is the arc of the pitch circle through which a tooth travels from its contact
with a mating tooth at the pitch point until contact ceases.

Axial pitch is the distance parallel to the axis between corresponding sides of adjacent
teeth.

Axial plane is the plane that contains the two axes in a pair of gears. In a single gear the
axial plane is any plane containing the axis and any given point.

Axial thickness is the distance parallel to the axis between two pitch line elements of the
same tooth.

Backlash is the shortest distance between the non-driving surfaces of adjacent teeth when
the working flanks are in contact.

Base circle is the circle from which the involute tooth curve is generated or developed.

Base helix angle is the angle at the base cylinder of an involute gear that the tooth makes
with the gear axis.

Base pitch is the circular pitch taken on the circumference of the base circles, or the distance
along the line of action between two successive and corresponding involute tooth
profiles. The normal base pitch is the base pitch in the normal plane and the axial base
pitch is the base pitch in the axial plane.

Base tooth thickness is the distance on the base circle in the plane of rotation between involutes
of the same pitch.

Bottom land is the surface of the gear between the flanks of adjacent teeth.

Center distance is the shortest distance between the non-intersecting axes of mating gears,
or between the parallel axes of spur gears and parallel helical gears, or the crossed axes of
crossed helical gears or worm gears.

Central plane is the plane perpendicular to the gear axis in a worm gear, which contains the
common perpendicular of the gear and the worm axes. In the usual arrangement with the
axes at right angles, it contains the worm axis.

Chordal addendum is the radial distance from the circular thickness chord to the top of the
tooth, or the height from the top of the tooth to the chord subtending the circular thickness
arc.

Chordal thickness is the length of the chord subtended by the circular thickness arc. The
dimension obtained when a gear tooth caliper is used to measure the tooth thickness at the
pitch circle.

Circular pitch is the distance on the circumference of the pitch circle, in the plane of rotation,
between corresponding points of adjacent teeth. The length of the arc of the pitch
circle between the centers or other corresponding points of adjacent teeth.

Circular thickness is the thickness of the tooth on the pitch circle in the plane of rotation, or
the length of arc between the two sides of a gear tooth measured on the pitch circle.

Clearance is the radial distance between the top of a tooth and the bottom of a mating tooth
space, or the amount by which the dedendum in a given gear exceeds the addendum of its
mating gear.

Contact diameter is the smallest diameter on a gear tooth with which the mating gear
makes contact.

Contact ratio is the ratio of the arc of action in the plane of rotation to the circular pitch, and
is sometimes thought of as the average number of teeth in contact. This ratio is obtained
most directly as the ratio of the length of action to the base pitch.

Contact ratio – face is the ratio of the face advance to the circular pitch in helical gears.
Contact ratio – total is the ratio of the sum of the arc of action and the face advance to the
circular pitch.

Contact stress is the maximum compressive stress within the contact area between mating
gear tooth profiles. Also called the Hertz stress.

Cycloid is the curve formed by the path of a point on a circle as it rolls along a straight line.
When such a circle rolls along the outside of another circle the curve is called an epicycloid,
and when it rolls along the inside of another circle it is called a hypocycloid. These
curves are used in defining the former American Standard composite Tooth Form.

Dedendum is the radial or perpendicular distance between the pitch circle and the bottom
of the tooth space.

Diametral pitch is the ratio of the number of teeth to the number of inches in the pitch
diameter in the plane of rotation, or the number of gear teeth to each inch of pitch diameter.

Normal diametral pitch is the diametral pitch as calculated in the normal plane, or the
diametral pitch divided by the cosine of the helix angle.

Efficiency is the torque ratio of a gear set divided by its gear ratio.

Equivalent pitch radius is the radius of curvature of the pitch surface at the pitch point in a
plane normal to the pitch line element.

Face advance is the distance on the pitch circle that a gear tooth travels from the time pitch
point contact is made at one end of the tooth until pitch point contact is made at the other
end.

Fillet radius is the radius of the concave portion of the tooth profile where it joins the bottom
of the tooth space.

Fillet stress is the maximum tensile stress in the gear tooth fillet.

Flank of tooth is the surface between the pitch circle and the bottom land, including the
gear tooth fillet.

Gear ratio is the ratio between the numbers of teeth in mating gears.

Helical overlap is the effective face width of a helical gear divided by the gear axial pitch.

Helix angle is the angle that a helical gear tooth makes with the gear axis at the pitch circle,
unless specified otherwise.

Hertz stress, see Contact stress.

Highest point of single tooth contact (HPSTC) is the largest diameter on a spur gear at
which a single tooth is in contact with the mating gear.

Interference is the contact between mating teeth at some point other than along the line of
action.

Internal diameter is the diameter of a circle that coincides with the tops of the teeth of an
internal gear.

Internal gear is a gear with teeth on the inner cylindrical surface.

Involute is the curve generally used as the profile of gear teeth. The curve is the path of a
point on a straight line as it rolls along a convex base curve, usually a circle.

The top land is the top surface of a gear tooth and the bottom land is the surface of the
gear between the fillets of adjacent teeth.

Lead is the axial advance of the helix in one complete turn, or the distance along its own
axis on one revolution if the gear were free to move axially.

Length of action is the distance on an involute line of action through which the point of
contact moves during the action of the tooth profile.

Line of action is the portion of the common tangent to the base cylinders along which contact
between mating involute teeth occurs.

Lowest point of single tooth contact (LPSTC) is the smallest diameter on a spur gear at
which a single tooth is in contact with its mating gear. Gear set contact stress is determined
with a load placed on the pinion at this point.

Module is the ratio of the pitch diameter to the number of teeth, normally the ratio of pitch
diameter in mm to the number of teeth. Module in the inch system is the ratio of the pitch
diameter in inches to the number of teeth.

Normal plane is a plane normal to the tooth surfaces at a point of contact and perpendicular
to the pitch plane.

Number of teeth is the number of teeth contained in a gear.

Outside diameter is the diameter of the circle that contains the tops of the teeth of external
gears.

Pitch is the distance between similar, equally-spaced tooth surfaces in a given direction
along a given curve or line.

Pitch circle is the circle through the pitch point having its center at the gear axis.

Pitch diameter is the diameter of the pitch circle. The operating pitch diameter is the pitch
diameter at which the gear operates.

Pitch plane is the plane parallel to the axial plane and tangent to the pitch surfaces in any
pair of gears. In a single gear, the pitch plane may be any plane tangent to the pitch surfaces.

Pitch point is the intersection between the axes of the line of centers and the line of action.

Plane of rotation is any plane perpendicular to a gear axis.

Pressure angle is the angle between a tooth profile and a radial line at its pitch point. In
involute teeth, the pressure angle is often described as the angle between the line of action
and the line tangent to the pitch circle. Standard pressure angles are established in connection
with standard tooth proportions. A given pair of involute profiles will transmit
smooth motion at the same velocity ratio when the center distance is changed. Changes in
center distance in gear design and gear manufacturing operations may cause changes in
pitch diameter, pitch and pressure angle in the same gears under different conditions.
Unless otherwise specified, the pressure angle is the standard pressure angle at the standard
pitch diameter. The operating pressure angle is determined by the center distance
at which a pair of gears operate. In oblique teeth such as helical and spiral designs, the
pressure angle is specified in the transverse, normal or axial planes.

Principle reference planes are pitch plane, axial plane and transverse plane, all intersecting
at a point and mutually perpendicular.

Rack is a gear with teeth spaced along a straight line, suitable for straight line
motion. A basic rack is a rack that is adopted as the basis of a system of interchangeable
gears. Standard gear tooth dimensions are often illustrated on an outline of a basic rack.

Roll angle is the angle subtended at the center of a base circle from the origin of an involute
to the point of tangency of a point on a straight line from any point on the same involute.

The radian measure of this angle is the tangent of the pressure angle of the point on the
involute.

Root diameter is the diameter of the circle that contains the roots or bottoms of the tooth
spaces.

Tangent plane is a plane tangent to the tooth surfaces at a point or line of contact.

Tip relief is an arbitrary modification of a tooth profile where a small amount of material is
removed from the involute face of the tooth surface near the tip of the gear tooth.

Tooth face is the surface between the pitch line element and the tooth tip.

Tooth surface is the total tooth area including the flank of the tooth and the tooth face.

Total face width is the dimensional width of a gear blank and may exceed the effective face
width as with a double-helical gear where the total face width includes any distance separating
the right-hand and left-hand helical gear teeth.

Transverse plane is a plane that is perpendicular to the axial plane and to the pitch plane. In
gears with parallel axes, the transverse plane and the plane of rotation coincide.

Trochoid is the curve formed by the path of a point on the extension of a radius of a circle
as it rolls along a curve or line. A trochoid is also the curve formed by the path of a point
on a perpendicular to a straight line as the straight line rolls along the convex side of a
base curve. By the first definition, a trochoid is derived from the cycloid, by the second
definition it is derived from the involute.

True involute form diameter is the smallest diameter on the tooth at which the point of tangency
of the involute tooth profile exists. Usually this position is the point of tangency of
the involute tooth profile and the fillet curve, and is often referred to as the TIF diameter.

Undercut is a condition in generated gear teeth when any part of the fillet curve lies inside
a line drawn at a tangent to the working profile at its lowest point. Undercut may be introduced
deliberately to facilitate shaving operations, as in pre-shaving.

Whole depth is the total depth of a tooth space, equal to the addendum plus the dedendum
and equal to the working depth plus clearance.

Working depth is the depth of engagement of two gears, or the sum of their addendums.

The standard working distance is the depth to which a tooth extends into the tooth space
of a mating gear when the center distance is standard.

Nomenclature:

φ =Pressure Angle
a=Addendum

aG =Addendum of Gear

aP =Addendum of Pinion
b=Dedendum
c=Clearance
C=Center Distance
D=Pitch Diameter

DG =Pitch Diameter of Gear

DP =Pitch Diameter of Pinion
DB =Base Circle Diameter

DO =Outside Diameter DR =Root Diameter
F=Face Width
hk =Working Depth of Tooth

ht =Whole Depth of Tooth
mG =Gear Ratio
N=Number of Teeth

NG =Number of Teeth in Gear

NP =Number of Teeth in Pinion
p=Circular Pitch

P=Diametral Pitch

Definitions of gear terms are given in AGMA Standards 112.05, 115.01, and 116.01 entitled
“Terms, Definitions, Symbols and Abbreviations,” “Reference Information—Basic
Gear Geometry,” and “Glossary—Terms Used in Gearing,” respectively; obtainable from
American Gear Manufacturers Assn., 500 Montgomery St., St., Alexandria, VA 22314.

Metric Threaded Fasteners

noreply@blogger.com (Neil Abapo) — Sat, 08 Jan 2011 04:44:00 +0000

AMERICAN NATIONAL STANDARD METRIC SCREWS

List of Standard ANSI for Metric Screws:

Table 1 ANSI B18.2.3.1M-1979 (R1989) Metric Hex Cap Screws
Table 2 ANSI B18.2.3.2M-1979 (R1989) Metric Formed Hex Screws
Table 3 ANSI B18.2.3.3M-1979 (R1989) Metric Heavy Hex Screws
Table 5 ANSI B18.2.3.8M-1981 (R1991) Metric Hex Lag Screws
Table 6 ANSI B18.2.3.9M-1984 Metric Heavy Hex Flange Screws
Table 7 ANSI B18.2.3.4M-1984 Metric Hex Flange Screws
Table 9 ANSI B18.5.2.2M-1982 Metric Round Head Square Neck Bolts
Table 10 ANSI B18.2.3.6M-1979 (R1989) Metric Heavy Hex Bolts
Table 11 ANSI B18.2.3.7M-1979 (R1989) Metric Heavy Hex Structural Bolts
Table 12 ANSI B18.2.3.5M-1979 (R1989) Metric Hex Bolts

More standards:
Keys and Keyways

Unified Screw Threads

noreply@blogger.com (Neil Abapo) — Fri, 31 Dec 2010 23:39:00 +0000

UNIFIED SCREW THREADS

American Standard for Unified Screw Threads

American Standard B1.1-1949 was the first American standard to cover those Unified

Thread Series agreed upon by the United Kingdom, Canada, and the United States to

obtain screw thread interchangeability among these three nations. These Unified threads

are now the basic American standard for fastening types of screw threads. In relation to

previous American practice, Unified threads have substantially the same thread form and

are mechanically interchangeable with the former American National threads of the same

diameter and pitch.

The principal differences between the two systems lie in: 1) application of allowances;

2) variation of tolerances with size; 3) difference in amount of pitch diameter tolerance on

external and internal threads; and 4) differences in thread designation.

In the Unified system an allowance is provided on both the Classes 1A and 2A external

threads whereas in the American National system only the Class I external thread has an

allowance. Also, in the Unified system, the pitch diameter tolerance of an internal thread is

30 per cent greater than that of the external thread, whereas they are equal in the American

National system.

Revised Standard.—The revised screw thread standard ANSI/ASME B1.1-1989

(R2001) is much the same as that of ANSI B1.1-1982. The latest symbols in accordance

with ANSI/ASME B1.7M-1984 (R2001) Nomenclature, are used. Acceptability criteria

are described in ANSI/ASME B1.3M-1992 (R2001), Screw Thread Gaging Systems for

Dimensional Acceptability, Inch or Metric Screw Threads (UN, UNR, UNJ, M, and MJ).

Where the letters U, A or B do not appear in the thread designations, the threads conform

to the outdated American National screw threads.

Advantages of Unified Threads.—The Unified standard is designed to correct certain

production difficulties resulting from the former standard. Often, under the old system, the

tolerances of the product were practically absorbed by the combined tool and gage tolerances,

leaving little for a working tolerance in manufacture. Somewhat greater tolerances

are now provided for nut threads. As contrasted with the old “classes of fit” 1, 2, and 3, for

each of which the pitch diameter tolerance on the external and internal threads were equal,

the Classes 1B, 2B, and 3B (internal) threads in the new standard have, respectively, a 30

per cent larger pitch diameter tolerance than the 1A, 2A, and 3A (external) threads. Relatively

more tolerance is provided for fine threads than for coarse threads of the same pitch.

Where previous tolerances were more liberal than required, they were reduced.

UN External Screw Threads: A flat root contour is specified, but it is necessary to provide

for some threading tool crest wear, hence a rounded root contour cleared beyond the

0.25P flat width of the Basic Profile is optional.

UNR External Screw Threads: To reduce the rate of threading tool crest wear and to

improve fatigue strength of a flat root thread, the Design Profile of the UNR thread has a

smooth, continuous, non-reversing contour with a radius of curvature not less than 0.108P

at any point and blends tangentially into the flanks and any straight segment. At the maximum

material condition, the point of tangency is specified to be at a distance not less than

0.625H (where H is the height of a sharp V-thread) below the basic major diameter.

UN and UNR External Screw Threads: The Design Profiles of both UN and UNR external

screw threads have flat crests. However, in practice, product threads are produced with

partially or completely rounded crests.

UN Internal Screw Thread: In practice it is necessary to provide for some threading tool

crest wear, therefore the root of the Design Profile is rounded and cleared beyond the

0.125P flat width of the Basic Profile.There is no internal UNR screw thread.

Other topics:

Standard Metric Keys and Keyways

Design of Keys

Engineering Materials

Standard Metric Keys & Keyways

noreply@blogger.com (Neil Abapo) — Wed, 22 Dec 2010 04:49:00 +0000

Design of Standard Metric Keyways for Square and Rectangular Parallel Keys.

Design of Keys

noreply@blogger.com (Neil Abapo) — Tue, 14 Dec 2010 14:00:00 +0000

Design of Keys

Pulleys, gears, sprockets, levers, couplings and similar devices are employed to transmit torque to or from shafts and usually are rigidly attached to the shaft by shrink fits, setscrews, keys, splines or cotters. Shrink fits are suitable for permanent assemblies, setscrews for light service and cotters for axial loads. When the parts must be disassembled, keys or splines generally are used. A key is a machine member employed at the interface of a pair of mating male and female circular cross-sectioned members to prevent relative angular motion between these mating members. The key fits into mating grooves in the shaft and mating member called the keyway and transmit torque by shear across the key. The cutting of the keyway into the shaft reduces its strength and rigidity by an amount depending upon the shape and size of the keyway.

Types of Keys

Keys maybe classified according to whether they are constant or variable in cross section. The constant cross-sectioned keys are square, flat, round or Barth keys. The Square key, with the key sunk half in the shaft and half in the hub, is the type most commonly used. The Flat keys are used where the weakening of the shaft by the keyway is serious. The key is sunk half in each of the two mating members. Although there is no universal standard, the width of square and flat keys usually is approximately one-fourth the shaft diameter. Keyways for round keys may be drilled and reamed after assembly of the mating parts. Small round keys are used for fastening cranks, handwheels and other parts that do not transmit heavy torques. A few manufacturers employ round keys for heavy duty shafts over 6 inches in diameter because the absence of the sharp corers reduces the stress concentration below that which would exist had a square or flat key been used. The Barth key is a square key with bottom two corners beveled. This double beveling ensures that the key will fit tightly against the top of the keyway when the drive is in either direction and lessens the tendency to twist. This key does not require a tight fit and small clearance permits easy assembly and removal.

Variable cross-sectioned keys include the woodruff, round taper, gib-head taper and the saddle keys. The Woodruff key consists of one-half of a circular disk fitting into a rectangular keyway in the female member and a semi circular keyway in the male member. It has the advantage that it weakens the shaft less than does a square or flat key of equal torque capacity. Round tapered keys usually have a taper in diameter of 1/8 inches per foot and a nominal diameter of 1/4 the shaft diameter for shafts under 6 inches in diameter or a nominal diameter of 1/5 the shaft diameter for large shafts. Gib-head taper keys are flat keys with varying height and with a special gib-head to facilitate easy driving and removal of key. Usually they are used with constant dimension flat keyway and have a taper in height of 1/8 inches per foot. Saddle keys are flat keys used without a keyway in the shaft. They are employed for light work or in cases where relative motion between the shaft and its mating hub is required for adjustment and a keyway cannot cut into both. A feather key is one which has a tight fit into one member and a loose sliding fit in the other mating member, It is used when there must be relative axial motion between the shaft and the mating hub. The bearing leading on feather keys should not exceed 1,000 psi; if the members are to slide under load, the bearing loading should under 1,000 psi.

Number of Keys Used
Usually only one key is employed between the two mating members. For heavy duty shafts, two keys angularly spaced 90 degrees apart or three keys 120 degrees apart are used. When multiple keys are employed, the keys usually square or flat and often tapered.

Splines
Splines are permanent keys made integral with the shaft and fitting into keyways broaches into the mating hub. They are used where maximum torque capacity is desired or where axial motion of the mating parts under load is expected.

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