Anyone used G50 to hold tight sizes?

[DanP]

I have suspected thermal expansion was messing a job and considered applying a correction factor with G50, scaling. The machine is a Digi Mori NMV5000 and it does not have temperature controlled coolant.

First part machined with inspection results way out of tolerance pointing towards thermal expansion then we did a set of holes done on a test plate. Test plate report looks good. Material used on both is aluminium, looked up the thermal expansion factor and was consistent with results on first part.

No answer yet for the job but surely G50 would be handy to fix true position, is better than cheating the figures in the program.

So, anyone here used G50 to fix bad results? I'd like to hear your story.


DanP

[Gunner Asch]

Post by DanP
I have suspected thermal expansion was messing a job and considered applying a correction factor with G50, scaling. The machine is a Digi Mori NMV5000 and it does not have temperature controlled coolant.
First part machined with inspection results way out of tolerance pointing towards thermal expansion then we did a set of holes done on a test plate. Test plate report looks good. Material used on both is aluminium, looked up the thermal expansion factor and was consistent with results on first part.
No answer yet for the job but surely G50 would be handy to fix true position, is better than cheating the figures in the program.
So, anyone here used G50 to fix bad results? I'd like to hear your story.
DanP

You could run dry cycles for 15-30 minutes before loading the first
part. Get the machine up to operating temps before making the first
cut.


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