Inspection of Diameters on a CMM (Coordinate Measuring Machine)

E

EdZachary

#11
Re: Inspection of Diameters on a CMM

You are correct, without some agreement, this will go on forever. This customer is not normally one that is difficult to deal with as so many are. That is why I am hoping to get some ideas from other places to assist me in reasoning with them. Thanks!
From my automotive background we had a somewhat similar problem with a Customer (just not exactly the same with a bushing) and agreeing on measurement. What finally got us past the forth and back was to use the identical CMM program and temperature for measurement(it was an aluminum casting for an engine Cam Carrier). Can you share the same program? We used PC-DMIS.

I still think the CMM is overkill ... just because you can get variable data doesn't mean you should unless the data is used to feedback to process control for the product being made/machined.
 
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R

rbriggs5145

#13
You are correct, average diameter is the correct way to measure. However, if they are not taking the points to calculate the circle perpendicular to the cylinder than the reading they are getting has error in it. We did some calculations and if my bore is off by 0.3° then my size would read 0.008mm larger than actual. Since my tolerance is ±0.025mm that makes a big difference. If you instead inspect this as a cylinder, the diameter is calculated with the angle as part of it and therefore removes the error due to the angle. If you add up the error in the way they are measuring, the temperature and normal gage correlation. . . . I have found some information on CMMWiki that talks about measuring diameters along with some information I've gotten from here. We have a conference call tomorrow to review some of this with our customer. Wish me luck!
 
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