CMM (coordinate measuring machine) calibration recommendations

T

True Position

#11
Re: CMM calibration recommendations

The tips as mentioned are not plastic but glass which has a coefficient expansion of zero. The probe will wear and must be changed out periodically. If you view a probe under a microscope you will see evidence of wear.

As far as an outside calibration service if they are not able to adjust the mapping software then it is only a verification that the machine meets the OEM specs. If you purchase a Renishaw Ballbar kit you can do this yourself and save your money. It is best to have the OEM or their agent come in an do the calibration for obvious reasons. Changing the mapping software should not be left to just anyone.

Mark Boucher
Where are you finding glass stylii? I'd be interested in looking at their web site to see what advantages they claim, especially with regards to scanning on cast iron and aluminum.
 
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M

mboucher

#12
Re: CMM calibration recommendations

For scanning on aluminum I use silicon nitrite this has the best wear of any of the probes when it comes to aluminum.

Mark Boucher
 
T

True Position

#13
Agreed, it doesn't get that buildup either. For scanning aluminum castings (unless there's something I'm unaware of) you can't go wrong with silicon nitride. I got some literature a while ago when Zeiss was trying to push diamond probes. I have not heard of them in a while, but I could see the use if you had really rough cast iron castings that you wanted to scan.
 
S

seamus26

#14
We have gone to an in house calibration, or rather "certification" as was accurately noted earlier. We use a calibrated QuikChek Master to check the volumetric in all three axes and then we also do a full blown MSA. Both of these are done annually. Not only does this save scheduling a day for an outside source to come in for calibration it saves us a bunch of cash, which makes everyone happy. We've been doing this on both of our CMMs now for three years with no problems. If we were to have an issue we would be required to call in the pros from outside. I hope that helps! :agree1:
 
J

JAltmann

#15
We have gone to an in house calibration, or rather "certification" as was accurately noted earlier. We use a calibrated QuikChek Master to check the volumetric in all three axes and then we also do a full blown MSA. Both of these are done annually. Not only does this save scheduling a day for an outside source to come in for calibration it saves us a bunch of cash, which makes everyone happy. We've been doing this on both of our CMMs now for three years with no problems. If we were to have an issue we would be required to call in the pros from outside. I hope that helps! :agree1:

Interesting, are you following B89 or the ISO-10360 procedures? What size is your QuickCheck master you are using? What size CMM? Is your company ISO registered? Is your QuickCheck sent out periodically for accredited calibration?
 
H

HomeroR

#16
No. Actually, most of the tip probes are made of ceramic or ruby. The calibration of probes with reference ball usually compensates the wear, but this has limitations when tips have cracks or little scratches.
 
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