Keith,
Your rotary table based on info you posted as follows:
Rotary table calc for .9 degree stepper:
- 72 handle turns per one table revolution x 400 stepper pulses per stepper rotation = 28800 pulses per one table revolution ie; 360 degrees
- 28800 pulses x 1/360 degrees = 80 pulses per degree
Since you are 1/2 stepping ..... 2 x 80 = 160 pulses
So your steps per unit should be 160 for the A axis.
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Link to the stepper calculator:
http://www.machsupport.com/forum/index.php/topic,16315.0.htmlSee attached pic.
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Now if you wanted to, you could always use the axis calibration in Mach > Settings (ALT-6 ) tab to set the steps per unit for the A axis.
Click on Set steps per unit button ( it's just above the Reset button) it will ask you to select the axis and how much you want it to move.
Then based on the actual DRO value displayed, you would put that number in and Mach would calculate what the steps should be. So if you accept the steps per unit will be changed.
RICH