[Du...] Posted January 10, 2023 Share Posted January 10, 2023 When qualifying my disk stylus i noticed my sigma value was unusually high and the form was almost .006. wondering if this would affect my measurements in any way. I know with a disk the sigma value isnt going to be great but its usually around .0003 to .0007.Screenshot 2023-01-10 144043.jpg Link to comment Share on other sites More sharing options...
[Ri...] Posted January 10, 2023 Share Posted January 10, 2023 I'll let someone else weigh in here as well, but I would think that since it is a manual qualification that you then manually compensate for with a ring gage, that the sigma value does not matter as much as say a spherical stylus. Discs are typically only used for size and location, they are not recommended to be used for form measurements. Link to comment Share on other sites More sharing options...
[Za...] Posted January 12, 2023 Share Posted January 12, 2023 Please sign in to view this quote. Yeah, there's a thread on here somewhere with how to do it. You have to copy an already qualified stylus and rename to your disk stylus, then make a program with an existing, qualified stylus and do the manual offsets in the stylus system management --> Geometry Link to comment Share on other sites More sharing options...
[To...] Posted January 12, 2023 Share Posted January 12, 2023 Please sign in to view this quote. Dustin is using an Active Sensor that supports Disc probes. No work-arounds required. Link to comment Share on other sites More sharing options...
[Ke...] Posted January 12, 2023 Share Posted January 12, 2023 Disclaimer: I do not use disc probes If you are concerned thet the high Sigma value may be due to buildup or wear, you can inspect the form to give you some piece of mind. Link to comment Share on other sites More sharing options...
[Ow...] Posted January 12, 2023 Share Posted January 12, 2023 Taking the points with the sphere section on the equator and not the edge of the disk is critical so, you might try redoing it and see if it get's better. While it's rarely perfect, it should be better than that if that's in inches. Also, after manually setting it up, choosing to re-do it automatically (CNC) with the caliper icon also helps improve the "s' value because the pressure is applied more equally. All said, setting the radius with the ring gauge is imperative for accuracy. I see you're using 2022 with the ugly icons 🤣 Link to comment Share on other sites More sharing options...
[Ow...] Posted January 12, 2023 Share Posted January 12, 2023 AttachedSpecial Styli - Disk-Angled-Cylinder -qualification.pdf Link to comment Share on other sites More sharing options...
[Ri...] Posted January 12, 2023 Share Posted January 12, 2023 Please sign in to view this quote. I didn't even pay attention that it was in inches. I agree with you here. Link to comment Share on other sites More sharing options...
[Du...] Posted January 12, 2023 Author Share Posted January 12, 2023 Please sign in to view this quote. ive been doing this for 5 years now and had no idea I could use the CNC requalification, i may try that today. and yes, my work keeps calypso updated, not a fan of the hideous icons. Link to comment Share on other sites More sharing options...
[To...] Posted January 13, 2023 Share Posted January 13, 2023 Please sign in to view this quote. If your sigma value is high because one or more of your points were too high or low on the sphere, the CNC qualification will likely not improve the results as it repeats the same points you took manually. I think I would work on improving the sigma value by getting better points. Then, the CNC qual will save you time in the future. I still think verifying and adjusting the disk geometry from a ring is the best way to get the best results from the disk probe. Link to comment Share on other sites More sharing options...
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