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Okay, and what about assembly error? I think there is an angle error in the mounting of the spindle over the Z axis (see attached pic).

But what about other angle error? So what if I have mounting...

Thanks. I will try it.
By the way I could reach improvement by setting the 4 microstepping instead of 8. But the accuracy is approximately +-0.2mm.

Hello everyone!

I have upgraded an old CMP 3020 CNC to work well with Mach3. I have removed the original electronics and leaved the power supply, stepper motors and chasis. Replaced the spindle...