Styli SD

[[Mi...]]

Curious as to know what you guys have as a standard deviation for your cal programs. I have mine set at .001 (Metric) an it has been that way for over a year. Came in today and its reading .0013 on my master probe. This also is making my Raduis/Diamter larger than usual. Im not sure if the machine got crashed out over the weekend and something got jacked up in the head. I have cleaned, restarted, cleaned, check the probe/sphere for any loose condition, then cleaned again....

Is a .001 SD too tight? Is that the norm? I have a prismo navigator w/ vast head

[[De...]]

I would say if its that high on your Master probe then something is not right. Might be just dirty or loose but it should not be that high of a standard deviation.

Our calibration programs are set to fail the master probe for a standard deviation over 0.0005 mm (0.000020") however the results usually come in at half that or less.

Regular probes we allow up to 0.001 mm however depending on tolerances for the part we start putting them under more scrutiny for anything over 0.0005 since that might be an indication that there are flat spots or something else going on with the probe.

All this said, whatever tolerances you use for yourself are up to you and are largely dependent on the tolerances of the parts you are checking, I mean all this kind of goes out the window if all your parts are +/- 0.010"

[[Mi...]]

Yeah my SD usually runs in a range of .00012 to .00027. Found out that the head was crashed in Z on Friday. Small probe .08 and it shattered.

I do not have any .00x call outs as most of mine are .0xx. I will talk with management and see what they want to do. Friend said a reman head is around $8700.00 if we have to go that route.

Thanks for your insight