Probe Verification Value Discrepancy

[[Er...]]

Hi all,

I am doing a probe verification with DK 0.2mm x MLE 3mm probe and I am getting a 0.001365 mm difference between the diameter of my probe verification's actual (7.99805 mm) and my master sphere's diameter (7.99994 mm). I'm typically used to seeing a difference of 0.000105 mm, which is 10x smaller. 

Does anyone have an idea on how to do a better qualification and reduce the difference between the probe verification's actual and master sphere's actual diameter?

More info on the qualification:

• Probe: DK 0.2mm x MLE 3mm (626103-5144-018)
• Probing force = 15mN
• Probing Dynamic = 5%
• VAST XT Gold head
• See Stylus System setup in attached picture

More info on the verification:

• Scan speed = 1 mm/s
• Number of points per section = 300 points
• See scan path in attached picture

Thank you!

[[Da...]]

 

The tensor calibration of a VAST XT wants to find the best compromise for the probe diameter for different speeds, diameter ranges, and probing forces, depending on the bending parameters of your probe. With very small or not very stiff (or both) probe setups, it will come to its limits. In this case, it is much better to do a six-point-calibration, which disregards the tensor (if you never used the tensor calibration for this probe or deleted the tensor data) or builds up on the existing tensor values. In any case you have to verify, that after the six-point-calibration your probe still measures good by scanning a gauge ring with a known value, and if it doesn’t, you can optimize your probe system using the gauge optimization. You are then somewhat limited to the speed and diameter range you used for the optimization, but at least you can use the probe. 

 

[[Er...]]

Hey Daniel, 

I did the six-point calibration and my actual value is already better. I'd like to do a gauge optimization next, but I can't seem to find info on where that function is. Could you please tell me where it is?

Thank you!

[[Da...]]

You’ll find this process in the manual under „Greater accuracy by gage correction qualification“, and in the menus under Resources/Utilities/Gauge Correction Qualification. After the qualification you need to tell your features that they should use the gauge correction by ticking the gauge (or was it gage) correction box within the features.