mechanisms and mechanical devices sourcebook

Mechanisms and Mechanical Devices Sourcebook - Chapter 3

Ngày tải lên : 22/10/2012, 14:26

... the raising and lowering of the transport is accomplished by a cam. The shafts, F, E, and D are positioned by the frame of the machine. Special bell cranks support the transport and are interconnected ... hand out of the way), (4) are fail-safe, (5) are sen- sitive enough to operate instantly, and (6) render the machine inoperative if anyone attempts to tamper with them or remove them. Safety mechanisms ... breaks while the machine is running, the unsupported idler carrier falls to the base of the standard, and when the standard arrives at the sta- tion in the raceway adjacent to the cam C, the lug L on the...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 4

Ngày tải lên : 22/10/2012, 14:26

... every lobe on gear 4, and T 3 /T 4 = L 3 /L 4 = 2/3, where T 3 and T 4 are the numbers of teeth on gears 3 and 4. T 1 and T 2 will denote the numbers of teeth on gears 1 and 2. Next, select the ... number of lobes L 3 and L 4 on the gears 3 and 4. In the drawings, L 3 = 2 and L 4 = 3. Any two lobes on the two gears (i.e., any two lobes of which one is on one gear and the other on the ... near standstill. In the disengaged position, the angular velocity ratio between the output and input shafts (the “gear” ratio) is entirely dependent upon the design angles α and β and independent...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 5

Ngày tải lên : 22/10/2012, 14:26

... 138 134 TWELVE EXPANDING AND CONTRACTING DEVICES Parallel bars, telescoping slides, and other devices that can spark answers to many design problems. Fig. 1 Figs. 1 and 2 Expanding grilles are ... turns. Dynamic and static balancing is simplified when an expanding wheel is attached to a nonexpanding main wheel. As a pulley, an expanding wheel can have a steel band fastened to only one section and ... 72º. 154 STROKE-AMPLIFYING MECHANISMS When the pressure angles of stroke- amplifying mechanisms are too high to satisfy the design requirements, and it is undesirable to enlarge the cam size, cer- tain devices...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 6

Ngày tải lên : 22/10/2012, 14:26

... ARRANGEMENTS Differential, duplex, and other types of screws can provide slow and fast feeds, minute adjustments, and strong clamping action. Rapid and slow feed. With left- and right-hand threads, slide motion ... and neg- ligible hysteresis characteristics. The bearing is radiation-resistant and can be used in high vacuum conditions or in environments where there is dirt and contamination. 185 TAUT BANDS ... and drives a dowel pin for locking purposes. A right- and left-handed shaft (C) actuates a press. Sclater Chapter 6 5/3/01 12:25 PM Page 192 Do you need a buffer between vibrating machinery and...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 7

Ngày tải lên : 22/10/2012, 14:26

... conveying, and elevating. STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AND CONVEYING SINGLE WIDTH—Sizes 5 ⁄ 8 in and smaller have a spring-clip connect- ing link; those 3 ⁄ 4 in and larger ... rotating handwheel with a differential screw moves nuts A and B together, and links I and II are brought into toggle. Fig. 13 A riveting machine with a reciprocating piston produces a high mechanical ... cycloidal is considered to be the best standard cam contour because of its low dynamic loads and low shock and vibration characteristics. One reason for these outstanding attributes is that sud- den...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 8

Ngày tải lên : 22/10/2012, 14:26

... motor com- parable in size and power to those used in standard reel-to-reel recorders, and a large bi-peripheral flywheel and sturdy capstan that reduces wow and flutter and drives the tape. A patent ... manufacturing and alignment and (2) thermal and vibrational changes in the sizes and posi- tions of the meshing components. One of the benefits is a reduction of gear-tooth- contact noise and vibration. ... the inertia of the flywheel and the accuracy of the flywheel and capstan. The greater the inertia the more uniform is the tape drive, and the less pronounced is the wow and flutter. The flywheel...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 9

Ngày tải lên : 22/10/2012, 14:26

... Page 317 336 LINKAGES FOR BAND CLUTCHES AND BRAKES Fig. 1 An outside band clutch operated by a roller and cone. Fig. 2 An outside band clutch made as two half wrap bands with an interme- diate ... requirements of MIL-E-5400, class 3 and MILK-3926 specifications. Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and precision potentiometers. Eight-Joint ... faster. Edges of the clutch bands carry the entire load, and there is also a compound action of one band upon another. As the torque builds up, each band pushes down on the band beneath it, so each...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 10

Ngày tải lên : 22/10/2012, 14:26

... electric machinery and protect it and its operator. Actuators Linear mechanical switches Sclater Chapter 10 5/3/01 1:08 PM Page 356 CHAPTER 10 TORQUE-LIMITING, TENSIONING, AND GOVERNING DEVICES Sclater ... clutch plates, gear fingers, and pinned members form the basis of these ingenious mechanisms. Mechanical stops are often required in automatic machinery and servomechanisms to limit shaft rotation ... 5/3/01 1:08 PM Page 361 356 MECHANICAL, GEARED, AND CAMMED LIMIT SWITCHES Limit switches are electric current switching devices that are operated by some form or mechanical motion. Limit switches...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 11

Ngày tải lên : 22/10/2012, 14:26

... POWER Cartridge-actuated devices generate a punch that cuts cable and pipe, shears bolts for fast release, and provides emergency thrust. Sclater Chapter 11 5/3/01 1:17 PM Page 402 Fig. 1 Automatic weighing and ... simplicity, and cost. Fig. 1 A bimetallic sensor is simple, compact, and precise. Contacts mounted on low-expansion struts determine slow make- and- break action. A shell contracts or expands with ... single-gland type. Automatic wear control compensates for normal wear and maintains volumetric efficiency. This pump will handle 5 to 300 gph without churning or foaming. It needs no lubrication and...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 13

Ngày tải lên : 22/10/2012, 14:26

... ψ 13 and ψ 12 . This establishes points A′ 2 , A′ 3 and A′ 4 , but here A′ 3 and A′ 4 coincide because of symmetry of A 3 and A 4 about A 0 B 0 . 4. Draw lines A 1 A′ 2 and A 1 A′ 4 , and the ... switches, latch mechanisms and mechanical overload controls. These toggles also serve as: (1) detents (for holding other parts in selected position); (2) overload devices in mechanical linkages ... crank -and- rocker mechanism problem can now be obtained with only the accompanying table and a calculator. An example in this knee-joint tester designed and built by following the design and calculat- ing...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 14

Ngày tải lên : 22/10/2012, 14:26

... capability and verifying commercial demand. Initially ADI built these devices by interleaving, com- bining, and customizing its internal manufacturing processes to produce the micromechanical devices ... lowered and the next layer is applied. This procedure is repeated until the 3D model is completed. A fault detection system determines the quality and thickness of the wax and plastic layers and ... organic and freeform shapes. Consequently, commercial software producers offer 3D hybrid surface and solid-modeling suites that integrate 2D drafting and 3D wireframe with 3D surface and 3D solid...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 15

Ngày tải lên : 22/10/2012, 14:26

... Cataloging-in-Publication Data Sclater, Neil. Mechanisms and mechanical devices sourcebook / Neil Sclater, Nicholas P. Chironis.— 3rd ed. p. cm. Rev. ed of: Mechanisms & mechanical devices sourcebook / [edited by] ... P. Chironis, Neil Sclater. 2nd ed. 1996. ISBN 0-07-136169-3 1. Mechanical movements. I. Chironis, Nicholas P. II. Mechanisms & mechanical devices sourcebook. III. Title. TJ181.S28 2001 621.8—dc21 2001030297 Copyright ... Inc., Port Washington, NY xv ACKNOWLEDGMENTS Sclater FM 5/3/01 9:50 AM Page xv MECHANISMS & MECHANICAL DEVICES SOURCEBOOK Third Edition NEIL SCLATER NICHOLAS P. CHIRONIS McGraw-Hill New York...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 12

Ngày tải lên : 22/10/2012, 14:26

... left-handed threads, • An eye on a shank with external right- handed threads, and • A flanged collar with left-handed external threads to mate with the shank of the first- mentioned eye, and right-handed ... is bulky and diffi- cult to use, requires periodic mainte- nance, and poses the threat of leakage of hydraulic fluid, which can contaminate the clean room. The actuator rests on a stand and imparts ... Chapter 12 5/3/01 1:25 PM Page 425 416 DETENTS FOR STOPPING MECHANICAL MOVEMENTS Some of the more robust and practical devices for stopping mechanical movements are illustrated here. Fixed holding...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 16

Ngày tải lên : 22/10/2012, 14:27

... angular-momentum-balanced, robot 48 ball -and- cone 250 ball -and- disk, and 251 ball -and- screw 5 12 bearings and roller 117 belt 12 224 257 belt -and- chain, variable speed 224 cam for ... friction 326 particle -and- fluid 327 magnetostrictive 327 mechanical basic 302 small, for precise service 322 mercury-gland 303 Index Terms Links Mechanisms cont. pin -and- disk, sliding ... 158 ring gear and slider 450 ring and slider, Jenson’s 450 robot 34 rocker arm and disk 123 roller-dwell 119 rotary, short-dwell 112 rotary-to-reciprocating motion and dwell 116...

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Mechanisms and Mechanical Devices Sourcebook - Chapter 17

Ngày tải lên : 22/10/2012, 14:27

... edition of Mechanisms & Mechanical Devices Sourcebook, a well illustrated reference book containing a wide range of information on both classical and mod- ern mechanisms and mechanical devices. ... first and second editions, (published in 1991 and 1996, respectively), that has been supplemented by new and revised articles reflecting present and future trends in mechanical engineering and ... programmable computer and digi- tal technology on those systems. Other articles discuss servomotors, actuators, sole- noids, and feedback sensors—important electromechanical, and electronic components used...