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.
Backlash
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JohnHaine
- CNC Apprentice
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- Joined: Mon 21 Nov , 2011 12:12 pm
- Hardware/Software: My Novamill, bought in Nov 11 without electronics, is now up and running under Mach3 with a home-build control box. I'm very pleased with the machine, only project so far is correcting a cheap small machine vice originally bought for a vertical slide to use on the machine - not a right-angle in it when bought!
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angel-tech
- CNC Guru
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Mach 3 - Location: Quatroland
Re: Backlash
check the angular contact bearings on each axis, they may need adjusting.
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JohnHaine
- CNC Apprentice
- Posts: 51
- Joined: Mon 21 Nov , 2011 12:12 pm
- Hardware/Software: My Novamill, bought in Nov 11 without electronics, is now up and running under Mach3 with a home-build control box. I'm very pleased with the machine, only project so far is correcting a cheap small machine vice originally bought for a vertical slide to use on the machine - not a right-angle in it when bought!
Re: Backlash
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.
John.
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angel-tech
- CNC Guru
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- Joined: Tue 14 Nov , 2006 12:12 pm
- Hardware/Software: .....
4 Quatros
3 Oracs
2 Easiturn atc
12 station lathe atc
Mach 3 - Location: Quatroland
Re: Backlash
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.
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JohnHaine
- CNC Apprentice
- Posts: 51
- Joined: Mon 21 Nov , 2011 12:12 pm
- Hardware/Software: My Novamill, bought in Nov 11 without electronics, is now up and running under Mach3 with a home-build control box. I'm very pleased with the machine, only project so far is correcting a cheap small machine vice originally bought for a vertical slide to use on the machine - not a right-angle in it when bought!
Re: Backlash
That's encouraging! I will check the thrust bearings and gibs.
Thanks, John.
Thanks, John.
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njlwilliamson
- Posts: 9
- Joined: Wed 18 May , 2011 9:12 am
Re: Backlash
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.
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.