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

On a sunny day (Sat, 17 Aug 2024 14:34:00 +0200) it happened
albert@spenarnc.xs4all.nl wrote in <nnd$50435767$685e9fd6@2c245718329e86b4>:

In article <v8jkp3$312tq$1@dont-email.me>,
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...

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  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.
>
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.

>
You need not have a diamond for this. Steel wheel dressers are used
before that. It works by removing the top layer of the wheel, where the dull
grains are, by hitting it.

Few days ago I cut a dead tree in my garden with a flex
cut just below the ground level, so I can mow grass over it...

Five minutes work.

Flex is a cool tool!