Re: OT: Marcury has a layer of diamond 10 miles thick, NASA spacecraft finds

On 8/3/24 00:39, Phil Hobbs wrote:

Jeroen Belleman <jeroen@nospam.please> wrote:

On 8/2/24 23:29, Ralph Mowery wrote:

In article <v8j0d5$2t70j$1@dont-email.me>, bill.sloman@ieee.org says...

>
 From what I could find in a quick search the industrial diamonds are
only about 10 to 20 dollars per carat versus the several thousand dollars
the jewel  quality ones would cost.  That is where I base my
'worthless' price at.

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Cheap isn't the same as worthless.
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My bad choice of words.  I should have said something more like they are
not worth much money.  They are very useful in industry, just do not
cost anything at all like the jewelery ones.
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Years ago I had an uncle that worked for a brick company and he used a
saw to cut the bricks for samples.  He had saved a jar full of diamonds
that came off the saw blades.  Thought he had some big money comming to
him.  Found out that that whole jar would only sell for a few dollars.
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Diamond is amazing. We had this benchtop wheel grinder to shape and
sharpen steel turning tools, and somebody had tried to grind a piece
of aluminium on it. A diamond-tipped wheel dressing tool went through
it as if it was butter. It's kind of amazing to see a grinding wheel
yield so easily to a tiny piece of diamond.
>
Jeroen Belleman
>

 Probably gummed it up pretty badly, too. Some alcohol makes a big
difference cutting Al.
 Cheers
 Phil Hobbs
 

Yes, that was the reason for dressing the wheel. People shouldn't
try to grind aluminium on these things. It irritates the mechanic.
We hate people who don't clean files, too.
Jeroen Belleman