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Are diamonds forever?

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Analog Kid View Drop Down
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    Posted: 12 Mar 2009 at 1:36pm
I have always wondered how a diamond, the hardest substance on earth, could be worn out by being dragged across a vinyl groove. A cartridge manufacturer told me it is rare for the diamond stylus itself to be worn out, and that in most cases the suspension of the cartridge wears out much sooner. Similar to a cassette deck where the motor and other mechanical parts of the deck wear out much faster than the tape heads.

So what is the truth, can the diamond stylus itself really last forever?



Edited by Analog Kid - 12 Mar 2009 at 1:38pm
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tg [RIP] View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tg [RIP] Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2009 at 9:02pm

Firstly, since it is possible to polish diamonds and cut facets on them it is possible to wear them.

Secondly, in the case of crankshaft bearings, it is the case-hardened crankshaft that wears faster than the soft white metal bearing.

Reason, the softer surface retains any very hard particles imbedded in its surface which then abrade the harder surface passing over it (rather like abrasive cloth/paper).

Nothing lasts forever  Cry Wink

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 2009 at 1:37pm
A material can be hard but can also be brittle. In other words hard doesn't mean tough.
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