[Cl...] Posted February 27, 2020 Share Posted February 27, 2020 How much variation would you expect to see, running the same program on two different Conturas? Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/ Share on other sites More sharing options...
[Ke...] Posted February 27, 2020 Share Posted February 27, 2020 Please sign in to view this quote. That's a trick question, yes? What types of features? Precision ground parts? Plastic Injection Molded? Assemblies? I would expect different variations for various reasons. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91290 Share on other sites More sharing options...
[Me...] Posted February 27, 2020 Share Posted February 27, 2020 I'd expect roughly 10 microns. This is our difference between a Contura (in a controlled environment) and our Accura (shop floor environment). Your variation would depend on your environment more than the different equipment. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91292 Share on other sites More sharing options...
[Cl...] Posted February 27, 2020 Author Share Posted February 27, 2020 Both in controlled environments, but one fluctuates considerably more than the other, (plus/minus 5 degrees). Parts are medical device, titanium & SS. Tolerances anywhere from .0005 - .005". Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91294 Share on other sites More sharing options...
[Ja...] Posted February 27, 2020 Share Posted February 27, 2020 I would expect no variation. I did once noticed about a 5 micron difference between our contura and Duramax on one part program, one feature measurement. I never was able pin point the reason but I have never seen the problem again. I don't usually look at, or beyond 5 microns though. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91296 Share on other sites More sharing options...
[Am...] Posted February 27, 2020 Share Posted February 27, 2020 If its in a controlled environment I wouldn't expect to see much difference at all, for the machines to pass the calibration it depends on the machines but even on a Duramax its like 2.4 microns. If its not a controlled environment you can see a lot of variation. a couple .0001s easy depending on the material. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91298 Share on other sites More sharing options...
[Ke...] Posted February 28, 2020 Share Posted February 28, 2020 Please sign in to view this quote. +/- 5 degrees is a little much, but I still think you should be able to be within a few microns... Hopefully, the temperature swing is a slow one. In rooms with larger fluctuations, it is much more important to have a recent probe calibrations. When I was chasing microns in an ISO 17025 Lab, I would need to re-calibrate if the temp changed by more than a degree. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91300 Share on other sites More sharing options...
[Cl...] Posted February 28, 2020 Author Share Posted February 28, 2020 We are seeing about .0004" variation machine to machine. Zeiss came in and did some verifications, and found nothing wrong with the head (RDS/XXT) or the machine. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91302 Share on other sites More sharing options...
[Ke...] Posted February 28, 2020 Share Posted February 28, 2020 Please sign in to view this quote. I would start with comparing measurements on a Master Ring. One on the larger side would be best (at least 4" diameter). Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91304 Share on other sites More sharing options...
[mi...] Posted February 28, 2020 Share Posted February 28, 2020 I get 2 micron range across 3 different Contura machines all with VAST XT Gold heads Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91306 Share on other sites More sharing options...
[Ch...] Posted February 28, 2020 Share Posted February 28, 2020 Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91308 Share on other sites More sharing options...
[Ow...] Posted February 28, 2020 Share Posted February 28, 2020 Thermal coefficient of expansion between tititanium and the many types of stainless can vary significantly as well as how long one retains the heat. That aside, I'd have to question fixturing and man. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91310 Share on other sites More sharing options...
[Cl...] Posted February 28, 2020 Author Share Posted February 28, 2020 Parts are brought right from the machine to me. I've been trying for 8 yrs to get them to allow for temperature acclamation, but it falls on deaf ears. Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91312 Share on other sites More sharing options...
[Ke...] Posted February 28, 2020 Share Posted February 28, 2020 Please sign in to view this quote. Would you like to borrow my magic wand? 🤣 🤣 Link to comment https://qualityforum.zeiss.com/topic/16414-cmm-vs-cmm/#findComment-91314 Share on other sites More sharing options...
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