By Harold Rothbart
The cam, used to translate rotary movement into linear movement, is a vital part of many periods of machines, equivalent to printing presses, fabric equipment, gear-cutting machines, and screw machines. Emphasizing computer-aided layout and production recommendations, in addition to subtle numerical regulate equipment, this guide permits engineers and technicians to make use of innovative layout instruments. it's going to lessen time spent at the planning stage and bring up productiveness and computer accuracy.
* Cam layout, manufacture, and dynamics of cams
* the most recent computer-aided layout and production techniques
* New cam mechanisms together with robot and prosthetic purposes (20040601)
Read or Download Cam Design Handbook: Dynamics and Accuracy PDF
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Additional info for Cam Design Handbook: Dynamics and Accuracy
Sample text
From it, analysis can be made for cam-follower system shock, noise, wear, and vibration. • The acceleration curve shall have no discontinuities where it blends with the dwell action of the motion. • Acceleration values at each point are related to the radius of curvature of the cam profile, which in turn relates to the surface stresses and wear. 11) BASIC CURVES 31 Therefore, the area of the acceleration curve for any cam has an area of positive action (+) equal to the area of the negative action (-).
Significance of pressure angle. 8 OTHER METHODS THAN CAMS Other methods than cams may employ mechanical, electrical, or fluid devices individually or in combination to satisfy the design requirements. Cam-follower systems and other methods have specific functional applications where they are selectively applied. The following are some of the major systems utilized and their performance compared to camfollower systems: (a) linkage mechanisms; (b) servo valve-controlled hydraulic cylinder; (c) stepper motor and controller, and (d) industrial adjustable mechanism.
This mechanism has the advantage of programmability in small force and low power applications but has speed limitations. The last alternate method involves the use of adjustable mechanisms in industrial applications. To achieve flexibility, the cams are replaced by multi-degree-of-freedom systems with multi-actuators and logic controllers. The adjustable or programmable mechanisms are utilized in flexible fixturing and flexible assembly systems. Their design is often complicated and costly. In general these devices are easier to manufacture but have limited speeds and limited force levels and are more costly.
