Roughness testing of of a rotating disk?
Roughness testing of of a rotating disk?
(OP)
I am not sure if this is even possible, but if so it would definitely be of use to me. I have spent some time looking into ways of measuring (in situ) surface roughness (Ra) of a rotating Cu disk, to determine changes in surface roughness with time, while is it being abraded. Since this experiment runs in a certain environment, having to stop the experiment and measure roughness every so often is a pain and an in situ method would be ideal for this application. I expect Ra anywhere from 10 to 250. The unit would have be portable since space is limited and I could not use any large system, especially when it comes to the probe.
Any suggestions would be appreciated.
Any suggestions would be appreciated.





RE: Roughness testing of of a rotating disk?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Roughness testing of of a rotating disk?
RE: Roughness testing of of a rotating disk?
That's not even in the realm of plausibility. You're going to have to stop the disk to realistically get meaningful measurements. None contact profilometers take upwards of 0.1 seconds to get their scans:
http://www.veeco.com/pdfs.php/21
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RE: Roughness testing of of a rotating disk?
I guess I’d take photos and use the astronomer’s technique of overlaying them to spot changes.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: Roughness testing of of a rotating disk?
IRstuff, a 1nm surface feature is about 254 times smaller than a 10 micro-inch feature (the OP's original minimum). That still rules out laser displacement sensors such a Keyences': http
OP: Can the disk be slowed to (for instance 1/2 rpm) for the duration of roughness testing?
RE: Roughness testing of of a rotating disk?
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RE: Roughness testing of of a rotating disk?
I really appreciate the comments and the help. Thank you.
RE: Roughness testing of of a rotating disk?
A non-contact approach for this type of application should be seriously considered:
http://www.microphotonics.com/PhotoMap3d.html
The above looks to be adaptable for an over-hung installation.
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RE: Roughness testing of of a rotating disk?
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