We have 24 CMMs, (7.10.7 SF and Global Advantage 5.7.5 on the shop floor) and a Global performance 9.12.8 in the metrology lab. The volumetric performance varies from 5 to 9 μm among the 24 machines (Hexagon calibration ASME B89.4.1b-2001), the metrology lab's CMM last calibration performance was 6.7 μm, This range of variation in the volumetric performance causes that the correlations between machines is a little doubtful, especially when the difference in the results should not be greater than 5 micrometers. What other arguments could be used in addition to the previous one to justify the purchase of a new CMM of greater precision and accuracy than the rest of the machines and take or use it as kind of master / reference CMM?
Shop floor machines, trying to correlate everything to within 5 microns? You probably wouldn't see 5 microns on the same machine with the same part if you measured the part every few hours just due to environmental factors.
Shop floor machines, trying to correlate everything to within 5 microns? You probably wouldn't see 5 microns on the same machine with the same part if you measured the part every few hours just due to environmental factors.
+1, correlations between SF and Global machines has to be done very carefully, I have to use same parameters, sometimes the same probe and measure parts within minutes of difference.
