How to switch stepper rotation?

I bought a small 3 axis mill a while ago. Electronically it ran fine with LinuxCNC 2.5. The machine was in great need of a mechanical rebuild. I have now done that, but I want to mount the X and Y motors on the opposite ends of the screws than they were. So their rotation directions need to be reversed. Can someone tell me the changes I need to make to the .hal or .ini files to make this happen? Or is it more involved than that?

The only other changes I will need is to change the total travel of each axis, and hopefully I can figure that out.

In your .ini file change the sign of SCALE for the axis you want to change direction.

www.linuxcnc.org/docs/devel/html/config/ini_config.html

So if
SCALE =1200
change to
SCALE = -1200

The travel is set with MIN_LIMIT and MAX_LIMIT

On a stepper system you can also invert the direction pin to reverse direction.

Rick G

you can also move the wires of the stepper motor by reversing each pair of coils
so yes theirs the easy way , and a hard way

you can also move the wires of the stepper motor by reversing each pair of coils

I think you meant one pair (phase) of coils not both.

Rick G

Thank you very much guys. Much appreciated!