Jim,
If I may ask, what size stepper motors did you use and what drivers? And what kind of rapids can you do. The rapids on my machine or set around 30ipm, which I need to use a tapping head.
To be honest I haven't been too happy with the cnc job because of the fairly large backlash and to correct it would take replacing the screws because they welded the ends of the acme screws to them, so you really can't just replace the ball nuts or add a second one to preload the first.
I pocket out a circle (clean out a 1.20 inch circle on a product that I build and I have say a .018 out of roundness issue) . This is one area that the backlash compensation doesn't quite do it.
Thanks,
Ron |