By Harold Rothbart

The cam, used to translate rotary movement into linear movement, is a vital part of many sessions of machines, reminiscent of printing presses, fabric equipment, gear-cutting machines, and screw machines. Emphasizing computer-aided layout and production innovations, in addition to subtle numerical keep watch over equipment, this guide permits engineers and technicians to make use of innovative layout instruments. it is going to reduce time spent at the drafting board and bring up productiveness and desktop accuracy.

* Cam layout, manufacture, and dynamics of cams
* the most recent computer-aided layout and production suggestions
* New cam mechanisms together with robot and prosthetic functions

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In general these devices are easier to manufacture but have limited speeds and limited force levels and are more costly. Cam-follower systems in comparison are complex in construction, are smaller, have better dynamic properties, carry a heavier load, and transmit more power over a longer time period. The applications are high-speed automobile valve controls, indexing tables, and industrial machinery such as paper converting and textile machinery. Designing cams and forecasting their performance is easy.

5. 26) h - y2 = C2 (b - q ) (b1 £ q £ b ) where C1 and C2 are constants h1= displacement at the transition point, in. b1 = angle of rotation for rise h1, radians Substituting in Eqs. 28) Combining Eqs. 5. b Skewed constant acceleration curve—DRD cam. Jerk, y''' = • b1 Jerk, y''' = • Dwell 38 CAM DESIGN HANDBOOK Since the velocities are equal at the point q = b1 differentiating Eqs. 30) Solving Eq. 37) Note that the jerk values equal zero except where that value is infinite at the points of acceleration discontinuity.

The designer should be sensitive to the customer’s suggestions on the performance of the machine, adaptability, strength, life, wear, corrosion, maintenance, and safety. • The customer’s machine operators may be strategically helpful in making the machine perform properly. • In the end, frequent communication between all involved will produce the best design, with the customer being the final judge. • For the designer, a list of computer software is in App. D. • Additional references include Jensen (1987), and Jones (1978).

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