CMM (coordinate measuring machine) calibration recommendations

M

mhirand20

#1
hello everybody

can you share how is your shop o lab calibrating the CMM machines?

we have 3 B&S CMM xcel, PC DIMS software, on site

thanks for sharing
 
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T

True Position

#2
Re: CMM calibration recomendations

Most people bring in outside contractors to calibrate them. Also, generally the manufacturers lock out the error maps so it's fairly difficult to return anything found out of spec back.

If you just want to validate your linear dimensions, some block stacks set along all 3 axis in multiple locations can do that.

For your volumetric calibration, most of the time I see a ball bar setup used. A laser is also often used to check the linear dimensions when we bring in someone from the outside.
 

bobdoering

Stop X-bar/R Madness!!
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#4
Re: CMM calibration recomendations

Most people bring in outside contractors to calibrate them.
Yes, generally a reputable outside contractor will not only verify the dimensional calibration, they can do any of the prescribed preventive maintenance that may be appropriate - such as internal cleaning, change air filters, etc., that you might not get around to, be aware of , or be trained to do.
 
T

True Position

#5
Re: CMM calibration recommendations

how about when the calibration fails?
If you have an outside calibration source who is approved by the machine vendor s/he would have the ability to modify the internal error maps. That is the difference between calibration and validation.
 
M

mhirand20

#6
Re: CMM calibration recommendations

Does the CMM calibration sphere requires calibration as well?
 
T

True Position

#7
Re: CMM calibration recommendations

Yes, since the accuracy of that sphere is directly related to your probe qualification it should be calibrated. Many outside calibration sources can check the spheres in house instead of needing to bring someone on site like the CMM requires.
 
M

mhirand20

#8
Re: CMM calibration recommendations

when I question the CMM operators about this, they told me that the probe has a plastic tip and they assumed the wear is minimal therefore calibration is void....

are all the probe tip made of plastic?
 
T

True Position

#9
Re: CMM calibration recommendations

CMM probe tips are usually made from artificial ruby or Silicon Nitride (a type of carbide that is mostly used when scanning Aluminum castings). I have never seen plastic used.

It's not necessarily damage that you're looking for, the sphere could be thermally expanding/contracting and not be correct without any visible damage.

Now I'll be somewhat honest, unless you are concerned about micron level tolerances you could ignore it to save some money, but it's $150 for a calibration and I have mine on a 2 year cycle.

Also, (on Calypso/Zeiss, possibly others) if you use disc shaped probes you will want a certified ring gage for setting them.
 
M

mboucher

#10
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
 
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