Inspect surface roughness finish at high temperature

Question

Inspect surface roughness finish at high temperature

awol (Mechanical)

(OP)

10 May 07 09:34

We have been using the Testex tape and dial indicator to measure and validate the surface roughness of steel. The Testex tape has a maximum working temperature of 150F and we need to measure the surface roughness on a slightly curved surface at temperatures of 300 F. If I use a thin aluminum or brass foil and use rubbing to transfer the profile of the curved surface to the foil, will I get a good reading?

JR97 (Mechanical) · Answer 1 · 2007-05-10 11:14:05

Seems to me an easy way to verify is to use the foil and tape on a cold surface and compare results. If you believe the foil will react differently at higher temperatures, again run a sample but use foil at 300 degrees, let specimen cool, use tape and compare results.

analogkid2digitalman (Electrical) · Answer 2 · 2007-05-10 13:40:14

Does surface roughness change with temperature over such a small range?

Just curious as to why- grain structure?

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Inspect surface roughness finish at high temperature