7 hours ago, Zerphan said:
I am unable to work out the steps per mm
Calculating the theoretical value (as a starting point) is fairly easy, but you need the (micro-)steps/rev of the stepper motor as well.
Simply compute the quotient of steps/rev of the motor and mm/rev of the pulley (20*2mm in your case).
For a common 1.8° stepper motor and 1/16 micro-stepping this would be: (200*16)/(20*2)
(assuming that all pulleys are of the same size).
There are online calculators for the lazy ones... 🙂
Just tell it to move 10mm and measure how far it moves. Figure out the ratio (actual distance / desired distance) and multiply that ratio by the current steps/mm. In other words if it moves 10% too far than increase steps/mm by 10%.
Then repeat but with the longest distance that is reasonable for more accuracy.
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