[An...] Posted October 21 Share Posted October 21 Good morning, I had some free time and decided to look into something that I realized I did not know the answer to: How much variation is there in the sigma values for my styli between qualifications? I ran my qualification program 10x and reported the sigma values in a trend protocol, which I have attached. I realized I also need the answer to another question if I am going to fully understand this little exercise I have done, which is the question I am posing to the group: How much variation should there be/is typical in the sigma values between qualifications? Link to comment Share on other sites More sharing options...
[Ri...] Posted October 21 Share Posted October 21 We always taught people that your sigma value, for a robust stylus system, should be no more than 35% of your MPE allowance. Given that value, I think this would be a case that I wouldn't really lose a lot of sleep over the variation. The sigma is the variation of the points taken for the probe qualification, so applying a constraint on the variation of the variation would be a little overboard. IMO that is. Link to comment Share on other sites More sharing options...
[An...] Posted October 21 Author Share Posted October 21 Thank you for your response, Richard. That's exactly what I was hoping to hear. Link to comment Share on other sites More sharing options...
[Je...] Posted October 21 Share Posted October 21 Please sign in to view this quote. . Andy, come work for my company. I appreciate the type of curiosity you've shown here. Nice work. . Link to comment Share on other sites More sharing options...
[Ri...] Posted October 21 Share Posted October 21 Attached is an Excel workbook I use. It has data for two Micura's. This is data based on 20 qualification runs of 5 different probes. (Three probes are in both +X and -X axis). This was run on Daily Qualifications, we now run on Weekly Qualifications. I have data for 11 months now of weekly qualification, it mirrors the daily runs. P.S. The workbook also does Bilateral. I think I may have got this from this forum. Use it as you wish.#Cp-Cpk_Micura CMM Probes 20x.xlsx Link to comment Share on other sites More sharing options...
[Je...] Posted October 21 Share Posted October 21 Please sign in to view this quote. . Rick, that's a great spreadsheet. Thanks for sharing it. Question: Why do you think machine #251 struggles with the 2mm system compared to #252? Does #251 ever hear "Why can't you be more like your sister?" 😂 It seems like they both do better with the 0.5x20 probe. Do you think weight is the main contributor here? What sensor does each have? . . Link to comment Share on other sites More sharing options...
[Ri...] Posted October 22 Share Posted October 22 Please sign in to view this quote. Well, now I have to investigate this. 🤣 They are identical Micuras and both have VAST XT Gold sensors. All of the probes are identical in build. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in