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linear actuators

Electromagnetic Linear Actuator Idea

G'day all.

I've been trying to think of a silent linear actuator, that is:

   - Quick or slow to move.
   - Offers precise movement.
   - Silent.
   - Run off electricity (ie: not on hydrolics).

I have found this video which looks like the closest to the above requirements:
https://www.youtube.com/watch?v=58o1LxwRmrM