Re: strange issue with grbl and arduino
Copy and paste here your GRBL settings - $$
Switches on the drivers determines motor current (1..3) and micro stepping (4..6)
From micro stepping and screw pitch you can calculate steps/per. If your SW3 is on (1 and 2 off), your driver is set to 16 micro steps, which gives 3200 pulses per one revolution of the motor.
Assuming that the pitch of your screw is 8mm, your steps/per is 3200 / 8 = 400 steps/mm and that should be your $100, $101 and $102 parameters
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