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Cnc minimill
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mattinker:
Cut down a drill bit from both ends ie cut the chuck end and the cutting end an resharpen. Mount the bit in a collet chuck.

Regards, Matthew.
chipenter:
2.5 mm for 3mm screws and 3.2 clearance  it lined up nicely , I need to raise the roof to get full travel on the mill , I was a carpenter for 50 years should still remember how to do one, a dormer will raise it by 400mm a job for the summer .
chipenter:
The belt was a complete falure it came apart before I could get it on the pullys , ordered two NFX525 from the local bearing shop and got NFX52 about 900mm short , reordered hopfully the right ones this time , changed the bearings on the X carridge and fitted the stop switches for the Y caridge , had to modify the scale on the X to get full travel because of the new bearing set up .
chipenter:
It's taken a while to get belts for the Z axis the supplier failed to supply after some arguments and failing to get my money back , I went for a pair of MXL belts from China more delay , fitted the belts but the Z felt stiff so made hand knobs and will put an index line in case of droped steps , I also bought a Mac3 board and driver to try .
chipenter:
Now I have the belts on laveled the bed and fitted stop swithes , had to fit a micro micro switch for the top of the Z because of the clearance , I will cut up a bear can to make cable clips to route the wiring and connect to the board .
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