rotary table setup

[Michael Devine]

I've added a simple rotary table with stepper drive. How do you set steps per inch or revolutions to calibrate it? I'll be using it horizontaly to make chess pieces and other things. It is my 4th axis with mach.

[kawazuki]

I've added a simple rotary table with stepper drive. How do you set steps per inch or revolutions to calibrate it? I'll be using it horizontaly to make chess pieces and other things. It is my 4th axis with mach.

Same as linear motion except you tell Mach the A axis is angular - General Logic Configuration.
You need to know the gear ratio between table and stepper - most are 1:90 or 1:72 so assuming a 200 step/rev motor with 10 micro steps and a 1:90 RT you get : 2000 steps per motor rev x 90 = 1 table rev or 18,000 steps per rev = 18,000 / 360 = 50 steps per degree or 1.2 minutes of a degree per step!
Depending on your tolerances, the low gearing on RT's almost make micro stepping overkill!
Hope that makes sense?