Quote Originally Posted by JoeHarris View Post
So starting up again, I got the spindle control from Mach set up last night. All seems to work OK, apart from the RPM readout on Mach reads 0 regardless of the spindle speed. Is that normal? The one setting I was not sure about was mach's "spindle pulley" settings. The IP-M manual was not much help on that front. Does anyone know what this should be set to for a 2.2KW chinese water-cooled spindle?

Sadly I think I am going to have to strip down the machine and sort out the bearings as they are binding quite regularly and causing pretty major accuracy issues. You get what you pay for I guess, and I should have shimmed them before I assembled the machine - lesson learned!
Strip down has commenced... feels good to be in it again!

and I have some mild steel tube on order to remake the undersized BK bearing spacers/shims.

14mm o/d with 1mm wall for the 16mm ballscrew bearings

and 18mm o/d with 1.5mm wall for the 20mm screws.

I guess mild steel is what the originals are made from?

The plan is to cut them from the tube slightly oversized and then neaten them up in my ancient lathe so they are nice and uniform in length all the way around. Does that sound reasonable to anyone who has done this before?!