Math help for Arduino-based stepper index head

[John S]

Alan,

Have a read of this, might save you a bit of work.

http://bbs.homeshopmachinist.net/thread ... controller

[ArtF]

Ive think rotary axis are at 40:1 to 72:1 typically. I think mine is about 40:1 but Id have to check. 
This is why most rotaries seem to use wormgear drives, easier to get large ratio's that way..

Art

[John S]

And the advantage of using worm drives is that they can't be driven backwards in the larger ratio's by cutting forces.