Our company has just bought a second hand vision CMM. It is basically a small (500mmx400mmx350mm) bridge style CMM with a camera on it. Not pcdmis or hexagon related at all.
We recently had the machine calibrated where the company (machine manufacturers - Baty) came in and calibrated it to there own standard. They also calibrated it using a small 50/60mm wide plaque with shapes on it at different positions on the cmm bed. All measurements apparently came out ok and they have provided a certificate.
The problem I have is that when I compare it to a touch trigger calibration they didn't check the measurement volume of the machine. There was no measurement from point X on one side of the machine to point Y at the other side like you would get when a KOBA bar is used. I know that 95% of the time we will only measure O rings etc, but if we were to measure a part with two holes in it that was 500mm long would we know that the measurement is accurate?
Has anyone got any experience with the calibration of vision systems on a CMM? is there an international standard that should be being followed?
Any answers would be great.
B,T & D
