[Cl...] Posted November 1 Share Posted November 1 I have two 543 O-inspects running the same program, same master part. Results attached. The greatest difference from all the dimensions (that I'm concerned with) is 0.0003" All of the dimensions shown are measured with the Dotscan except for 221 (4x). Is a difference of 0.0003 large enough to be concerned? Link to comment Share on other sites More sharing options...
[DW...] Posted November 1 Share Posted November 1 I am going to say yes. What kind of characteristic and features? Also you can use the absolute function in Excel for your delta formula, for example =ABS(D5-E5) to always return a positive integer. Link to comment Share on other sites More sharing options...
[Cl...] Posted November 1 Author Share Posted November 1 Thanks, I wasn't aware of =ABS(D5-E5). These are the two I'm concerned with 200a/200b are line profiles 215 is a center-to-center distance using circles constructed from two Contour in best fit constructions. Link to comment Share on other sites More sharing options...
[DW...] Posted November 1 Share Posted November 1 I'm afraid I can't be terribly helpful here. Perhaps enable additional printout for the line profile and compare the coordinates of where the deviations are at the largest? For 215 are you constraining the size of the circles? Link to comment Share on other sites More sharing options...
[Cl...] Posted November 1 Author Share Posted November 1 Please sign in to view this quote. As for the constraint question. I don't know I didn't write this program. Link to comment Share on other sites More sharing options...
[Ke...] Posted November 4 Share Posted November 4 "Standard" Profiles with one result are usually 2x the greatest deviation from nominal. I typically report the x/y/z deviations, and compare those, instead of the Profile result. Link to comment Share on other sites More sharing options...
[Cl...] Posted November 4 Author Share Posted November 4 In this particular situation, I am concerned with the fact that two different machines running the exact same program and the exact same part are getting 0.0003" difference in two of the dimensions measured. I need to know, 1) is this too much? (I believe it is) and 2) what is causing the difference? Link to comment Share on other sites More sharing options...
[Ma...] Posted November 4 Share Posted November 4 That difference is 0,00762mm - so this can be dust, temperature, probing head, calibration. It depends on type of part ( grinded, milled, any surface finish ) Strategy can effect too - scan would point to probe head/tip Is deviation on specific axis so it can be confirmed with cal. ring? Link to comment Share on other sites More sharing options...
[Cl...] Posted November 4 Author Share Posted November 4 Parts are thoroughly cleaned before measurement. Measurement was done directly after each machine had all its sensors qualified. Part is a centerless ground SS cylinder. The dimension in question 3d curves measured with the White-light (DotScan). Then a contour in best fit construction from those measured curves. Link to comment Share on other sites More sharing options...
[Ke...] Posted November 5 Share Posted November 5 Please sign in to view this quote. I'm not very familiar with the DotScan, but: Did you review the differences between the sensor qualification results on each machine? Link to comment Share on other sites More sharing options...
[Cl...] Posted November 5 Author Share Posted November 5 Please sign in to view this quote. I have not. I've been looking at everything else I could think of, but not that yet. That's my next step. Thanks. Link to comment Share on other sites More sharing options...
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