Threaded rod M10x1.5, bend to radius 342.834 mm will require rate of 1 turn /min.
If it is driven by stepper of 200 steps/rev, the rate will be 3.3333 steps/sec, quite reasonable speed.
This can be increased by additional gear reduction.
Last edited by bojan; 19-02-2007 at 03:58 PM.
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