Hi Chip,
I may be misunderstanding you, but all my ratios are small pulley to large pulley, so there wouldn't be any cancelling out. I have: 10 teeth to 36 teeth (3.6 : 1), 10 teeth to 24 teeth (2.4 : 1), and 10 teeth to 24 teeth (2.4 : 1), so I have 3.6* 2.4*2.4 = 20.736 : 1, correct? What would I change around?
The error is at the cutter tip. The DRO reads just as it should (X0.00 Y0.00).
I have the pins set exactly as you described in your previous post. Tom Caudle frmo Cand CNC.com says that the Step needs to be positive (Red "X"), in order to get proper accuracy, but if I do that, the motors jsut groan and dont move any discernible amount. Putting a Green checkmark on them makes the motors sing along very smoothly. Just with this extremely frustrating creeping on Y. (It starts at X0.00 Y0.00, goes out and does some movements, and when it come back, the DRO reads X0.00 Y0.00, but the cutter bit is offset by 0.016".) It's entirely repeatable - if I run the program 100 times, the offset is 0.016" X 100, everytime.
Let me know if I'm misunderstanding your post.
Thanks
Dave
Saltspring Island