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Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... 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 angu- lar velocity ratio between the output and input shafts (the “gear” ratio) is entirely dependent upon the design angles α and β and independent...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... 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 ... 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 ... links. Fig. 7 Telescoping cylinders are the basis for many expanding and contracting mechanisms. In the arrangement shown, nested tubes can be sealed and filled with a highly temperature-responsive medium such...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... 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 ... made in widths up to 12 strands. STANDARD ROLLER DIAMETER—made with 1 to 4 in pitch and cotter-pin-type connecting links. OVERSIZED ROLLER DIAMETER—Same base chain as standard roller type but not ... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... 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 ... manufac- turing 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... 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 ... between the two units, at all speeds and loads. The variations caused by oil leakage and sim- ilar factors are compensated automati- cally by the idler roll and linkage. They adjust the pilot valve ... floating rolls are combined with two separate con- trollers and actuators. The first controls the in-feed speed and tension of the paper stock, and the second controls the wind-up. The in-feed is controlled...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... 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 ... required. The striker mechanisms illustrated are operated by springs, cams, magnetic force, air and vacuum chambers, and centrifugal force. The drawings show only the striking mechanisms. Fig. 5...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 13
... 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 ... example, in Fig. 1 two angular motions, φ 12 and φ 13 , must be synchronized with two others, ψ 12 and ψ 13 , about the given pivot points A 0 and B 0 and the given crank length A 0 A. This means ... ψ 13 , and ψ 14 , using freely chosen pivot points A 0 and B 0 . In this case, crank length A 0 A as well as B 0 B is to be determined, and the procedure is: 1. Locate pivot points A 0 and B 0 on...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 14
... permit lettering, callouts, and the entry of notes and parts lists, and some even offer the capability for calculating such physical properties as volume, weight, and center of gravity if the drawing ... 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...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 15
... Technologies Group, Radford, VA • Ledex Actuation Products, TRW Control Systems, Vandalia OH • Sandia National Laboratories, Sandia Corporation, Albuquerque, NM • SolidWorks Corporation, Concord, MA • ... 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 ... applications beyond NASA’s immediate objectives in space science and requirements for specialized equip- ment. The names of the scientist/inventors and the NASA facilities where the work was performed have...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 12
... 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 ... is pushed upward an additional 15º, locking the handle cam and the slide. In step 6, the handle is rotated an additional 30º, forcing the box and the mating spring-loaded electrical con- nectors...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 16
... 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...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 17
... 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 ... third edition of Mechanisms & Mechanical Devices Sourcebook, a well illus- trated reference book containing a wide range of information on both classical and mod- ern mechanisms and mechanical ... illustra- tions and descriptions of basic mechanisms and mechanical devices, accompanied by useful applications information. This material has been culled from a wide range of books and magazines...
Ngày tải lên: 22/10/2012, 14:27
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