Hi Boyan,

Thank your for you reply.
However I think that current axis setup could be transformed to small cnc router quite easily. Y axis rails are on rather solid piece of metal - would be decent bed if mounted to sturdier frame. Gantry should be rebuild of course.
Today I measured ball screws:
X and Y axis - OD 15 mm, pitch 20 mm.
Z axis - OD 12 mm, pitch 10 mm.

I actually have quite a few servos and drives already.
Drives I have: Electrocraft SCA-B4-70-10. https://www.electrocraft.com/products/drives/SCA-B4-70/