CMM - Calibration Frequency and Variation

L

Leestrath

#1
Happy New Year Everyone,...:),

I am currently working on CMM calibration frequency and variation.

Problem definition: We have morethan 25 CMM's in our manufacturing site, and it costs us lot of money to calibrate the CMM's. We are targeting 12 or 18-month calibration, current calibration frequency is less than 9months and in many cases it is less than 6 months....

There are recurring problems with the CMM repeatability, reproducibility and between machine variations in the manufacturing cells.

Example: I inspected the same component on different CMM's and the results varies between 3 to 6 microns within the machine and 14 to 24 microns between the machines,.... .

After these findings, now I am looking into
1. The compressed air quality supplied to CMM operation,
2. The influence of temperature (it varies between 23 to 27 degree Celsius),
3. The interface error between the OEM and Renishaw head,
4. Quality of Air filters used
5. Daily maintenance etc...

Has anyone come across this sort of situation before? Please share your views and experiences

Have A Great Year Ahead!

Cheers thanks,...
 
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Ron Rompen

Trusted Information Resource
#2
Depending on the tolerances you need to hold, 3 to 6 microns variation within 1 machine is not (in my opinion) excessive. In general, unless you are using a very high-end machine, this is approaching the limits of the ability of the equipment to measure.

Air pressure can have some effect on the equipment, but ambient temperature, vibration, part cleanliness and airflow will (probably) have a much bigger effect. Thermal compensation is available on some machines (I know Zeiss has it on theirs) and may be worth investing in if your manufacturing processes demand it.

Another thought, to reduce your costs, is to perform internal calibration of your equipment with a known standard, calling in an outside source only when the equipment approaches the limits of function. Most equipment manufacturers will provide the training necessary as well as the CMM standards you require to perform the calibration.
 
R

Richard Pike

#3
I had a similar issue with a recent client. Assuming you can live with the error of 6 micron - then consider running a Stability Chart per station. This worked for us and reduced our calibration costs by almost 80%.. i.e. we only did anything to the gauges (other than routine care) when the Stability Chart indicated assignable variation.
 
L

Leestrath

#4
Thanks Richard,...

It would be great if you could explain a little bit and share the approach/method followed by you to establish stability chart.

thank you
 
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