[Ju...] Posted July 10, 2023 Share Posted July 10, 2023 We recently had a review by a customer of a new part that included the phrase "feel 150+ with finger tactile to surface roughness patch." Has anyone ever heard a customer use this phrase? Is this the surface finish equivalent of a heat index? (Actual surface finish is ____, but it feels like ____.) Link to comment Share on other sites More sharing options...
[Ri...] Posted July 10, 2023 Share Posted July 10, 2023 Please sign in to view this quote. https://www.mcmaster.com/products/gauge ... e-testers/ That's the old way of measuring surface roughness. Just like the old way to measure hardness was with a file. Link to comment Share on other sites More sharing options...
[Jo...] Posted July 10, 2023 Share Posted July 10, 2023 I have this. It is a good reference, because it has lapped,ground,horizontal milling, vertical milling, and turning method examples.In addition there is another one specific to as cast surfaces. Those get hard to "measure". takes a calibrated thumbnail. lolSPI_Roughness_Standards_30-695-1__18272.jpg Link to comment Share on other sites More sharing options...
[Ju...] Posted July 10, 2023 Author Share Posted July 10, 2023 Please sign in to view this quote. Should we ask for the calibration date of the customer employee's thumbnail? I was unaware this service was offered by Zeiss lol. Link to comment Share on other sites More sharing options...
[To...] Posted July 10, 2023 Share Posted July 10, 2023 Please sign in to view this quote. Please sign in to view this quote. I know this sounds like a fish tale but I learned that using your "eye" tooth instead of your fingernail, produces vibrations that are more sensitive than your fingernail. It does make for some peculiar facial gyrations on some parts. Don't believe me? Try it. Link to comment Share on other sites More sharing options...
[No...] Posted July 11, 2023 Share Posted July 11, 2023 Please sign in to view this quote. Haha, I've still got a similar one, but for eroded surfaces. In the past we always compared our parts to the standard, because for our plastic parts the main aspect was not so much a super-accurate roughness value, but the uniform look and feel of an assembly made from several parts. Nowadays the tool maker.is responsible for surface roughness and we hardly measure it anmyore. Link to comment Share on other sites More sharing options...
[Ün...] Posted July 11, 2023 Share Posted July 11, 2023 Please sign in to view this quote. In the past, I had a friend who checked the part coming out of the grinding with his tooth and found a close value with the surface roughness device 🙂 Link to comment Share on other sites More sharing options...
[Ke...] Posted July 11, 2023 Share Posted July 11, 2023 Please sign in to view this quote. I also know some real old school types that do this to check probes for hairline cracks. They usually prefer in back on the molars, light pressure and spin the probe. You can always tell when they find a crack, because no matter how many times they've done it they always look like they just got zapped. Link to comment Share on other sites More sharing options...
[No...] Posted July 12, 2023 Share Posted July 12, 2023 Please sign in to view this quote. Link to comment Share on other sites More sharing options...
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