First cnc build from surplus liquid dispensing machine

**ryzen** · 06-08-2019

Hi Bert,

I don`t have much information about the motors. I only have these spec sheets from motor manufacturer. I also salvaged them from old Siemens pick&place machine.
From that machine datasheet I can see that guaranteed X and Y axis resolution was 2.5 µm.
Max. speed X-axis was 2 m/s
Max. speed of Y-axis was 2.5 m/s

But this resolution is probably because of some other parts. I think these motors can perform better than that. Older pick and place machine axis are usually belt driven so that is the reason they are so fast. I have no idea what kind of drivers I should get for these motors. Motor that was on Y-axis is huge and weighs nearly 10 kilos.

I don`t know the ball screw pitch but by the looks of it they can be more than 20 mm. Most likely can not be used for large cnc because OD is quite small, maybe 10 mm or so.

Yes full enclosure would be very beneficial.

**Boyan Silyavski** · 10-08-2019

This machine definitely has to be scrapped as in this format is no good for anything CNC related.

Unfortunately i see good only the rails , as the ball screws seem to fast for the resolution of a normal CNC. If motors are not servos with servo drives, basically don't waste your time with it.

**ryzen** · 12-08-2019

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/