Quote:
Originally Posted by Richard Wallace
Lash in the potentiometer gear mesh will also be a factor in repeatability, with the ones mentioned in the preceding posts. Of course, lash/play in the mechanism powered by this actuator will be (at least) equally important.
Can someone involved in making the demonstration arm shown in the linked video please measure and post the unpowered vertical play at the end of the arm? I think tape measure accuracy would be enough to give us all a good idea of what to expect.
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You are correct, there will be the backlash in the POT gears, pulleys and screw. You also need to take into account the bit rate of the controller as well if being driven by position commands via feedback from the pot.
We will set up a test to measure the unpowered vertical play in that or similar assembly in the coming week.