I'm having trouble setting up my steps per unit in the motor tuning section of mach3.
I have a small 3 axis router table with mach 3, Gecko G212 drives and Vexta 1.8 deg steppers.
The drives are set up for 10 micro-step
The Axis in question (first to set up) "X" has a cog belt drive with .200" (1/5th inch pitch belt and a 16 tooth cog. Ratio: 1rev=3.2" x axis travel
My calculations are (stepper) 200 steps per rev x 10uS = 2000 steps per rev / 3.2 = 625
Should be 625 steps per unit (inch)
I have the native units set to inches
When in MDI mode if I tell it to move 1 inch, it moves a small fraction of an inch.
After some trial and error I came to the setting in "steps per unit" of 16,250 to actually get the 1" requested. (measured with a dial indicator)
Its pretty close to perfect if not perfect but my calculations dont support this number.
What could be wrong with this picture?