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Milling a tight tolerance hole / accuracy

CoertHFT

Plastic
Joined
Sep 16, 2021
Hi,

If there's been a post about this subject before please let me know.


But I've got a bit of a situation. For a couple times now I tried to mill a tight tolerance hole on my HaasUMC750ss, it's a helical operation (posted with Fusion360). But the machine manages to mill it 0,3mm (more than 10 thousands) too small, in my perspective I'm not using excessive feeds. Our HaasVM3 got no problem with milling a tight tolerance hole right from the start, but with high feeds (a 1,5mm hole with a 1mm endmill is no problem). I know that a VM is a moldmaker and got a finer leadscrew. So is this a 'problem' that VF series got as well?



I hope to hear from you,
Coert
 
My 09 vf2 has no issue interpolating a hole within a few tenths with little effort.

Ball screws
Vm =fine
Vf = standard
Ss = high helix

From my understanding you do get finer movement resolution with finer ballscrew, but looking at the servo encoder count,
any of the machines should be able to bore a respectable hole.

Now add a bad tool holder/setup/program….. all that… but 0.01” out is a lot! Sure “stock to leave” was not tuned in? :p
 








 
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