[Cl...] Posted August 29, 2019 Share Posted August 29, 2019 We have two parts approx. 6.0" long. One is .0934 in diameter, the other is .1247, made form both M2 and 440a SS. There is a "Master part" for each diameter. These are ran daily through the program to ensure that the measurements are consistent. Yesterday when they were run for validation, one dimension in particular (measured with the CFS) measured .1968", while the same part measured today was .1974". The temperature is fluctuating 3-4 degrees (73 - 76/77). I re-qualified all the sensors (tactile/camera/CFS) and nothing has changed in the programs. Stylus are clean and solid. Can a 3-4 degree temperature increase affect enough change in the material to see a .0006 difference? Link to comment https://qualityforum.zeiss.com/topic/17852-temperature-o-inspect-543/ Share on other sites More sharing options...
[Am...] Posted August 29, 2019 Share Posted August 29, 2019 It depends on the material I don't think 440 SS would change that much with such a small diameter. I have a o-Inspect 322 and I know with that model the factory spec on the accuracy is 2.4 + L/150mm which drops to 2.6 + L/150mm in a temp over 24°C so at 77°F you are possibly getting worse accuracy but only slightly (and not necessarily but they are allowed a bigger range at that temp). What kind of stylus are you using? Link to comment https://qualityforum.zeiss.com/topic/17852-temperature-o-inspect-543/#findComment-100248 Share on other sites More sharing options...
[An...] Posted August 30, 2019 Share Posted August 30, 2019 we also had a 543 once, which we gave back after 6 months. It is so that the 543 with high temperature differences does not come clear. This CMM takes that very badly. Link to comment https://qualityforum.zeiss.com/topic/17852-temperature-o-inspect-543/#findComment-100250 Share on other sites More sharing options...
[Cl...] Posted August 30, 2019 Author Share Posted August 30, 2019 Please sign in to view this quote. The features that are changing are measured with the white light sensor. Link to comment https://qualityforum.zeiss.com/topic/17852-temperature-o-inspect-543/#findComment-100252 Share on other sites More sharing options...
[Ja...] Posted September 3, 2019 Share Posted September 3, 2019 Temperature is not an issue for this problem. The thermal coefficient of expansion for 440 stainless is 0.00000567"/inch/degree. For a 0.197" diameter: 0.00000567 x 0.197 = 0.00000112 per degree 0.00000112 x 4 degrees = 0.00000448 Link to comment https://qualityforum.zeiss.com/topic/17852-temperature-o-inspect-543/#findComment-100254 Share on other sites More sharing options...
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