[Ja...] Posted August 13, 2020 Share Posted August 13, 2020 Has anyone did studies on the accuracy differences between the RC-CAA Calibration and individually calibrating each stylus by itself? My assumption would be that the RC-CAA is less accurate, but I can't find anything that proves or disproves that. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/ Share on other sites More sharing options...
[Ri...] Posted August 13, 2020 Share Posted August 13, 2020 Please sign in to view this quote. The CAA is less accurate. This is something that is discussed during Basic Training. As for studies, the problem with the study is that every RDS is different when it comes to their accuracy of CAA. You would need to take a large sample size to determine your average and range. Anyways, from what I've seen there are a lot of factors in calculating the accuracy of a stylus system using CAA vs not using CAA. The main factor is length of the stylus system. Most people that I know don't use CAA because they don't have that many articulations, so it is kind of a moot point. I believe it does 12 articulations to calculate the CAA, so I'd say that is don't have any or much more than 12, then stick with the normal qualification. It will always be the most accurate way to qualify your stylus. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78828 Share on other sites More sharing options...
[Ja...] Posted August 13, 2020 Author Share Posted August 13, 2020 Unfortunately I have a customer that is using it for their production floor, so I'm having to use it for the programs that I am writing for them. Them doing individual calibrations isn't feasible unfortunately. Some of the tolerances on these parts are extremely tight, sometimes down to a tenth or two. I missed the whole basic training spiel, I was just thrown to the wolves with this machine. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78830 Share on other sites More sharing options...
[Ri...] Posted August 13, 2020 Share Posted August 13, 2020 Please sign in to view this quote. Yeah I would say that if you are chasing tenths that CAA is not the go to choice. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78832 Share on other sites More sharing options...
[Me...] Posted August 14, 2020 Share Posted August 14, 2020 I did a quick accuracy comparison on my machine when we first got it in regard to CAA vs Normal Calibration, particularly with unique angles. The difference was about .00035 - .00040 inches for CAA & I can hold a consistent calibration of under .000020 the normal way. CAA is good for sheet metal and non tight-toleranced parts, we just have no use for it due to the precision our customers need. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78834 Share on other sites More sharing options...
[Ün...] Posted August 14, 2020 Share Posted August 14, 2020 I did not see that the S value fell below 0.020 mm in cca calibration. I do not use CCA due to my narrow tolerances. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78836 Share on other sites More sharing options...
[Gr...] Posted August 17, 2020 Share Posted August 17, 2020 Two years ago we purchased an Accura II. It has the RC-CAA stylus system. We asked the Zeiss instillation tech about the accuracy and his response it is only guaranteed accurate within .002 of an inch. This would not work for us because 95% of our work is .0002 of an inch or less. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78838 Share on other sites More sharing options...
[Da...] Posted August 18, 2020 Share Posted August 18, 2020 Did a quick unscientific test years ago. Made a program to inspect a Z point on a corner of a sturdy part. Then I rotated to various angles and rechecked the exact same point. Readings varied around .0004 of an inch. It doesn't work very well. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78840 Share on other sites More sharing options...
[To...] Posted August 18, 2020 Share Posted August 18, 2020 Please sign in to view this quote. Quick question Dave. Are you doing a Full Qualification or the Re-qualification. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78842 Share on other sites More sharing options...
[Da...] Posted August 18, 2020 Share Posted August 18, 2020 Please sign in to view this quote. That was with the caa calibration. Then I calibrated each angle separately and it came down to less than .0001 This was YEARS ago. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78844 Share on other sites More sharing options...
[To...] Posted August 18, 2020 Share Posted August 18, 2020 Please sign in to view this quote. Yes, I understand it was CAA but there are two CAA qualification routines; Full Qualification and Re-qualification. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78846 Share on other sites More sharing options...
[Da...] Posted August 19, 2020 Share Posted August 19, 2020 Usually re-qual, it did all the standard positions. Link to comment https://qualityforum.zeiss.com/topic/14838-rc-caa-calibration-vs-individual-calibrating-stylus/#findComment-78848 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