I baught 5/8" ballscrew Right hand thread for my HF mill conversion my question is? The Y axis has Left hand thread acme leadscrew could i use the RH ballscrew in my conversion in place of the LH screw and just use Mach3 to change motor direction to compensate for the difference in direction or will i have to try to return the RH ballscrew for the Y axis and get LH thread ballscrew?

There is a reverse motor setting you can check in Mach 3.
No worries.

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Andy

Thanks i appreciate the fast reply i didn't think there was going to be a problem as you can reverse the motors in mach3 but i just wanted to be sure