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7th April 2013, 08:15 AM #16.
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Applied under vacuum means it will be a vapour deposition process
My guess is that the material is aluminium oxide since sapphire is the gemstone name for corundum or Aluminium Oxide which can readily applied to metal surfaces by vapor deposition.
Alox is hard stuff which is why it is used in abrasives but diamond will readily deal with it - this is why diamond is used as a dresser for Alox grinding wheels.
If you send me a dud file I will do any manner of testing on it
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7th April 2013 08:15 AM # ADSGoogle Adsense Advertisement
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7th April 2013, 09:09 AM #17
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7th April 2013, 09:25 AM #18
Are you holding your breath? I wouldn't.
I do in fact have a dud that was coated. We got a few files coated, just for the hell of it, to see what gives. Total waste, and rendered brand new files completely and utterly useless! They just skate over the top of the metal. So what I'll do as a test (when the Dremel is fixed, and crowie has given me a clue on that) is to have a go at the dud Milled File shoulder (this is the file that I referred to earlier about wearing out 2.5 files trying to sharpen it - it's still not much cop as a float because of the coating). None of us really understand why the coating has very little dulling effect on a point (essentially of no dimensions), but on a one dimensional edge it completely dulls it, or prevents it from cutting. But that's the reality, and the coating ain't for files.
You may recall that you and I had some private discussion about my crackpot theory on the coating keeping the rasp point in tact until the coating wears away on the point exposing a still brand new sharp point (my theory being that the rasps may actually wear in). Of course you debunked this , saying that it would be more likely that when the coating molecules came away then it would probably also be with particles of the steel tooth as well. Tell you what though, it sounded good to me!
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7th April 2013, 09:45 AM #19.
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