Denford Software & Machines

Having had a couple of unexpected small tolerance issues, and being a newbie to CNC milling, I realised that backlash could be the problem. I measured the backlash at 0.03 mm on X and Y, and about 0.02 mm on Z. Are these of the order to be expected on the Novamill please? I have switched compensation on in Mach3 and it seems to have improved matters.

John.

check the angular contact bearings on each axis, they may need adjusting.

Thanks, worth a try. But presumably the ballscrews aren't perfect anyway, do you know what the spec is for them, or what might be achievable on the Novamill please?

John.

the ballscrews are ground and have double ballnuts, so they should have zero backlash. I've not seen one yet with bad screws, and i've seen quite a few.

That's encouraging! I will check the thrust bearings and gibs.

Thanks, John.

Hi,

Did you manage to eliminate the backlash? I have about the same on mine. I tried adjusting the thrust bearings and gibs but it is still about 0.02mm on all axis.