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Old 02-17-2009, 09:18 PM   #73 (permalink)
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Hi All,

What about using bellows, like from a linear table of a machine tool. There would be constant actuation load versus speed and position. So, you could run it back and forth with a cord and pulley turned by a motor.

The other device that would not have load variation with speed (or much) and position would be Basjoos's rotary door (PVC tubing with slot). This could be activated by solenoids if sectioned off, or a 1/2 turn rotary motor.
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