hexagon logo
Register Sign in
  • Replies 5 replies
  • Subscribers 222 subscribers
  • Views 479 views
  • Users 0 members are here
Options
Related

Probe Calibration Parameters

Spikalus
I have searched the forum extensively on this topic and found a lot of good information but I am still not completely satisfied.

I use TP20's with a wide variety of tip configurations at multiple index angles. I have gathered that different probe configurations may require different calibration parameter settings (i.e. Number of Hits, Touch Speed, Number of Levels, etc) in order to get the best calibration. I have been told this is especially true for miniature probe tips and tips on the long end of what a module is rated for.

The one piece of advice that I am struggling with the most is in regards to the Number of Hits to use. I have heard lots of opinions that span from 5-25 hits and from multiple sources that the number of hits needs to be odd. I have also heard that the number of hits needs to be prime. I can not rationalize why this matters and I have in fact only seen evidence to the contrary. I accept that there may not be a "good" answer to this but I was hoping someone out there may have some information that would give me the confidence to go one way or the other when deciding how many hits to use.

If anyone has any advice on how to pick the other parameters I would love to hear it as well.
Parents
  • With a TP20 I've done experimenting and found it's best to do a high number of hits that ARE a multiple of 3. I used to believe it was to be avoided because of the tri-lobed nature of the TP20, but when all of my tests on an XX gage indicated the opposite, it made sense. By measuring in multiples of three, you are equally displacing the inherent form error of the TP20 and causing it to average to no (OK, virtually no) error.

    As for number of hits, ask yourself what linear spacing you'd be comfortable with on a straight line. 24 hits on a 10mm diameter is a hit every 1.3mm, on a 200mm diam it's every 26mm.
Reply
  • With a TP20 I've done experimenting and found it's best to do a high number of hits that ARE a multiple of 3. I used to believe it was to be avoided because of the tri-lobed nature of the TP20, but when all of my tests on an XX gage indicated the opposite, it made sense. By measuring in multiples of three, you are equally displacing the inherent form error of the TP20 and causing it to average to no (OK, virtually no) error.

    As for number of hits, ask yourself what linear spacing you'd be comfortable with on a straight line. 24 hits on a 10mm diameter is a hit every 1.3mm, on a 200mm diam it's every 26mm.
Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement