Cam Design Handbook: Dynamics and Accuracy by Harold Rothbart

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By Harold Rothbart

The cam, used to translate rotary movement into linear movement, is an essential component of many periods of machines, comparable to printing presses, fabric equipment, gear-cutting machines, and screw machines. Emphasizing computer-aided layout and production ideas, in addition to subtle numerical keep an eye on equipment, this guide permits engineers and technicians to make use of innovative layout instruments. it's going to reduce time spent at the strategy planning stage and raise productiveness and laptop accuracy.
* Cam layout, manufacture, and dynamics of cams
* the newest computer-aided layout and production techniques
* New cam mechanisms together with robot and prosthetic functions (20040601)

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Extra resources for Cam Design Handbook: Dynamics and Accuracy

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In view of the poor characteristics of this curve, mathematical presentation is omitted. 6 CONSTANT ACCELERATION CURVE This curve of the polynomial family is also known as the parabolic curve and has constant positive and negative acceleration values. The curve has the smallest maximum accelerations for all curves possible (Fig. 4). 3. Modified constant velocity curve with circular area—DRD cam. 4. Acceleration, y" Constant acceleration curve—DRD cam. substituting in Eq. 20) 36 CAM DESIGN HANDBOOK The boundary conditions are q =b b q= 2 q =b y =h 2h y¢ = b y¢ = 0 yield constants C0 = - h, C1 = 4h -2 h , C2 = b b Substituting in Eq.

Note, the acceleration is negative because the follower is reversing its acceleration in a minus, downward direction. Also, mathematically speaking, the slope is to the left (second quadrant), which means a negative value. The jerk values may be approximated in the same manner by plotting the acceleration curve and finding the slopes. 3 BASIC CURVE CLASSIFICATION In this chapter we present some basic curves of the DRD type and their kinematic relationships. In design, the first step is to sketch a time chart (discussed in Chap.

Find the displacement, velocity, and acceleration of the follower after 30 degrees of cam rotation (a) by use of formulas and (b) by employing the data in App. B. 9. Simple harmonic motion curve—DRD cam. 62 rad 180 From Eq. 52 gives velocity y¢ = hp pq sin in rad and with Eq. 62 1 Acceleration by Eq. 62 Solution (b) In App. 11 CYCLOIDAL MOTION CURVE The cycloidal motion curve, as the name implies, is generated from a cycloid and has a sine acceleration curve. A cycloid is the locus of a point on a circle that is rolled on a straight line.

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