Mechanisms and Mechanical Devices Sourcebook - Chapter 18
Mechanisms and Mechanical Devices Sourcebook - Chapter 18
... 148Parallel-Link Mechanisms 150Stroke Multiplier 150Force and Stroke Multipliers 152Stroke-Amplifying Mechanisms 154Adjustable-Stroke Mechanisms 155Adjustable-Output Mechanisms 156Reversing Mechanisms ... Typical Associated Mechanisms 181 Flexures Accurately Support Pivoting Mechanisms and Instruments 183 Taut Bands and Leadscrew Provide Accurate Rotary Motion 185 Air S...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... CHAPTER 3PARTS-HANDLINGMECHANISMSSclater Chapter 3 5/3/01 10:19 AM Page 51 5 2MECHANISMS THAT SORT, FEED,OR WEIGHORIENTING DEVICESHere’s a common problem; Parts arrive in either open-end ... movement, andthe top disk provides the up -and- down force necessary for thecutting action.This four-bar linkagewith an extended couplercan cut a web on the runat high speeds. The four-bar linkage .....
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... smoothness and flexibil-ity in converting constant rotary motioninto a start -and- stop type of indexing.It works equally well for high-speedoperations, as fast as 2 seconds per cycle,including index and ... favorablehigh-speed characteristics for stop -and- go mechanisms isr3= R3The profile defined by this equationhas, among other properties, the charac-teristic that, at transition fro...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... tilting and uncertaintyin the distance between the plates). Otherprior mechanisms relied on spring load-ing, differential multiple-point drives andother devices to reduce backlash. In pro-viding ... inven-tors include Evans, Tchebicheff, Roberts ,and Scott-Russell.Four-bar arrangement. Like othermechanisms that aim at straight-linemotion, the Daniel design is based on thecommon four-ba...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... A standard rotat-ing-air fitting is required.Reciprocating linear force link: It recipro-cates with one-, two-, or three-convolutionair springs in a back-to-back arrangement.Two- and three-convolution ... stictionless and neg-ligible hysteresis characteristics. Thebearing is radiation-resistant and can beused in high vacuum conditions or inenvironments where there is dirt andcontaminati...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... composedof circular arc 1-2 with center at 02, arc 3-4 with center at 03, arc 4-5 with center at01, arc 5-6 with center at 04, arc 7-1 withcenter at 01, and the straight lines 2-3 and6 -7 . The method calls ... frequentlyemployed in automatic-feed mechanismsand screw machines They are the circular,constant-velocity, simple-harmonic,cycloidal, modified cycloidal, and circu-...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... ft-lb atthe maximum input speed of 180 rpm.Speed can be varied between 4.5 to 1 and1 20 to 1.Zero-Max drive (Fig. 22). This driveis also based on the variable-stroke prin-ciple. With an 180 0-rpm ... losses in the gears and bearings andfrom windage and churning of lubricant.gear power: A gear’s load and speed capacity, determined bygear dimensions and type. Helical and helical-ty...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... Rzappa-type jointto get the desired effect.Ball -and- socket. Basically, the True-Speed joint is a system of ball -and- socket connections with large contactareas (low unit pressure) to transmit tor-sional ... ofMIL-E-5400, class 3 and MILK-3926specifications.Applications were seen in counter andreset switches and controls for machinesand machine tools, radar systems, andprecision potenti...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... warning light and second tolight a red bulb and also sound an alarmbell.Over-the-side or over-the-rear loadingrequires a different setting of theBourdon pressure-gage unit than doesover-the-front loading. ... signal devices. The load plunger and the swaged-on cable termina-tion have ball -and- socket seat sections to permitmaximum free cable movement, reducing the possi-bility of fatig...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... steel, monel, andbronze for handling acids, oils, and sol-vents. The impeller is made of pressure-vulcanized laminated layers of Hycar, 85 to90 percent hard. Sand, grit, scale andfibrous materials ... to a minimum. Thisheavy-duty gear pump can be used at pressures up to 1,000 psi.These pumps were made with either single- or double-endshafts and can be foot- or flange-mounted. The drive sh...
Ngày tải lên: 22/10/2012, 14:26