Mechanical Design: Shoulder Bolts, Rotary Speed Limiters, & Ball Plunger

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Shoulder screws (watch video from 0:00 to 5:00) are like socket head cap screws, but only threaded at the very end, the rest of the length up to the head being unthreaded and of a larger diameter than the threaded end.

Rotary dampers (watch video from 5:00 to 8:55) are special pieces of hardware that limit (or “dampen”) the speed of rotational motion.

Spring loaded ball plungers and retractors (watch video from 8:55 to end) typically consist of a barrel (often threaded externally), some type of end piece (often a ball or a pin) that protrudes out the end of the barrel and can be displaced in and out along the axis of the barrel (but is prevented from ever coming completely out of the barrel)




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