There's been some debate here about what the CMM is capable of measuring to when it comes to the 10:1 rule. Obviously we can change the resolution on the dimensions we want reported way out. What number do you guys reference for this?
Here is a copy of the cert that I am referencing. This is from Hexagon Tech K. T. that was here in July 2015. So what I attached was listed as the volumetric performance, measurement uncertainty. There is also a page that lists Repeatability, Measurement uncertainty but that shows Uncertainty at 0.029 um, but also lists each individual axis X (0.45 um) Y (0.55 um) Z (0.37 um). Is that what you were referring to instead of volumetric uncertainty?
Report ID: b9c56c73-9016-e511-b48d-001372675f77
Certificate Number: 72601551161147
4/1/96
April,
The uncertainty listed on the lower left is per meter, not per ballbar length. The ballbar information on the right is for reference.
Under a half micron is not bad for volumetric, really.
Check the uncertainties for each axis. Good practice is to use the worst one when calculating if the machine can reliably check the close-tolerance stuff, to be on the safe side.
Here is a copy of the cert that I am referencing. This is from Hexagon Tech K. T. that was here in July 2015. So what I attached was listed as the volumetric performance, measurement uncertainty. There is also a page that lists Repeatability, Measurement uncertainty but that shows Uncertainty at 0.029 um, but also lists each individual axis X (0.45 um) Y (0.55 um) Z (0.37 um). Is that what you were referring to instead of volumetric uncertainty?
Report ID: b9c56c73-9016-e511-b48d-001372675f77
Certificate Number: 72601551161147
4/1/96
April,
The uncertainty listed on the lower left is per meter, not per ballbar length. The ballbar information on the right is for reference.
Under a half micron is not bad for volumetric, really.
Check the uncertainties for each axis. Good practice is to use the worst one when calculating if the machine can reliably check the close-tolerance stuff, to be on the safe side.
