affordable CNC with decent tolerances and speed

My point was that lead screw error can be programmed out. The backlash, once measured, is entered as a parameter in the control. One of the first things I did after installing the new control was measure backlash and enter it in. Unfortunately, there is some variance in backlash over the length of the travel. But, the machine will interpolate a hole that's .0006 out of round in the approximate center of travel. Of course, you are right about a smaller machine maybe not being able to hold tight tolerances. My knee mill is 3 times heavier and aboutt 1.5 times as large as a bridgeport mill. So it is massive enough to get good accuracy on heavier parts. ERS

I used the servos already on the machine. If you want, e-mail me and I'll send you my phone number and I'll tell you all about it. Eric

I concur. I think the Mazaks are at least another level higher from the machines I mentioned previously and should have no troubles with your tolerance. Of course, the downside is $$$$

Or Mori-Seki.

Gunner

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