Re-Built a used CNC mill machine to the point of 80%

[dudz]

I don't intend to use fast feed rates, and never plunging. I have tried to get as much clearance between the spindle and the bed.(150mm) . If I can get 1.5mm of cut on each pass (and I'm sure I will) then that's great. The Y rails are 25mm thick over 500mm ish. I never had a problem with the gantry before I beefed it up. In fact using a plunge, the spindle would push the original bed down so hard it would bend near the ends and the X axis 25mm unsupported rails would bend without the gantry moving at all. The weakest point is the Y axis rails IMO. I will find out soon enough. I don't care if a job that should take 10 mins actually takes 40mins. I just want accuracy. The next step will be to put a 5mm plate behind the rails and change them for supported ones, but that's if I get any problems.

[JAZZCNC]

I don't care if a job that should take 10 mins actually takes 40mins. I just want accuracy. The next step will be to put a 5mm plate behind the rails and change them for supported ones, but that's if I get any problems.

I think you'll find that while it may well cut at 1.5mm DOC the finish will be rubbish and the machine will quickly feel the affects and start to suffer with accuracy.

If you want accuracy and quality finish then you'll need to beef up the frame and Z axis or take shallow DOC.!