I'm having a problem with a 4th axis on my mill.

In the past, I would set everything up, and switch the cabling around on my Y and A axis and everything would work great. That worked since steps and ratios worked out were the same.

I upgraded to a precision lead screw on the Y axis, which has a different pitch on the threads.

The problem is that I can't move the A axis in a program. I can go into jog mode, and use the insert/delete keys and the A axis spins just like it is supposed to. So I know it's not a wiring problem or something, it's a configuration problem someplace. In jog mode, the displayed position of the A axis changes as well.

I went into my G-code program, did a find/replace and changed all the Y's to A's. Program runs, just the rotary table never moves.

Any ideas what could be wrong?

If you select the "MDI" screen, and type a line of code in the manual data entry textbox, does the machine respond correctly to the commands?

William

Thanks for the response William.

Figured it out. Brain fart on my part. For some reason, the steps per rev was 1/100 of what it should have been. So it was actually moving, just didn't look like it.

Think it's all fixed.

Yep, I done that one too!!

William