[Ty...] Posted October 31 Share Posted October 31 Hello, I have less than a year of experience creating inspection programs, and was curious as to why in the report the x y z values of a profile characteristic differ from the x y z values of the true position characteristic? I assumed they represent the location of the feature (cylinder). the true position values seem to be the correct values. I've been looking through the zeiss knowledge base for answers with no luck. thank you! Link to comment Share on other sites More sharing options...
[Ri...] Posted October 31 Share Posted October 31 If you are speaking about Basics on the BP vs a True Position to (example: A_B_C). The basics on the BP may not reflect actual values from the DRF (Datum Reference Frame). TP_Ø.010_A_B_C Red is the DRF. This means the True Position can report different values than the basics. https://www.faro.com/en/Resource-Librar ... th-figures Link to comment Share on other sites More sharing options...
[Cl...] Posted October 31 Share Posted October 31 Are the two being evaluated to the same datums? Does the profile have basic dimensions? Link to comment Share on other sites More sharing options...
[Cl...] Posted October 31 Share Posted October 31 Please sign in to view this quote. Opp's. Looks like Rick got in before me. What he said. Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 thank you for the link Rick! I apologize for not adding the other information. Both characteristics are using datums A B and C (same filters and evaluations.) and yes the profile has basic dimensions. Link to comment Share on other sites More sharing options...
[Ri...] Posted October 31 Share Posted October 31 Please sign in to view this quote. Are the basics from A,B,C? Or just randomly shown from other features? Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 The report is saying the true position y value is near the .170, but the profile y value is around .190.position.jpg Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 Please sign in to view this quote. the base alignment uses datums a b and c Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 Please sign in to view this quote. print.jpg Link to comment Share on other sites More sharing options...
[Ri...] Posted October 31 Share Posted October 31 Open the feature dialog box and post a screan shot. Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 I have 3 circle paths being recalled to this feature, I constrain the radius to give its location. I have another feature without the constrain for the size of the radius.featurewindow.jpg Link to comment Share on other sites More sharing options...
[Da...] Posted October 31 Share Posted October 31 If your base alignment is the same as the datum reference frame, make sure to check the evaluation settings for each feature used in the alignment. If you are using least squares fit in your base alignment but outer tangential fit in the datum reference frame in the true position characteristic, you will get differing results. Also, make sure to check your measurement method system settings. The attached screenshot is what I use for all our CMMs.Capture.PNG Link to comment Share on other sites More sharing options...
[Ri...] Posted October 31 Share Posted October 31 Please sign in to view this quote. I should have asked for live data. Can you show live data for the profile and the feature? Link to comment Share on other sites More sharing options...
[Ja...] Posted October 31 Share Posted October 31 The X Y Z values of reported in additional report of profile characteristic refers to the values of the point with worst deviation and not the nominal/center of the feature itself Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 Please sign in to view this quote. Thank you! Link to comment Share on other sites More sharing options...
[Ky...] Posted October 31 Share Posted October 31 Hello all, I hate to jump in since Jayesh's response covers it very well, but like he said, if you look at the additional report in a profile, it gives you the point driving that profile (i.e. the point furthest from the nominals in the DRF). In this case, as far as I can tell, it would be a point on the shell of the cylinder. The true position is based on the axis of the cylinder, so that point will be somewhere in the middle of that cylinder. I've seen this question a few times on the phone support line over the years, and that option isn't super useful for a profile. It's going to move around a little based on what area is actually the worst and how it measures, and it doesn't really give you an idea of what is wrong with the profile. I would recommend looking at the CAD>CAD evaluation menu to display how the profile looks relative to the nominal instead. It is more qualitative, but it does give a good idea of what the profile actually looks like. I hope you find this useful. Link to comment Share on other sites More sharing options...
[Ty...] Posted October 31 Author Share Posted October 31 Please sign in to view this quote. Extremely useful! Thank you for this explanation Link to comment Share on other sites More sharing options...
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