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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: OT: Marcury has a layer of diamond 10 miles thick, NASA
 spacecraft finds
Date: Fri, 2 Aug 2024 22:39:37 -0000 (UTC)
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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.
>>> 
>>> Cheap isn't the same as worthless.
>>> 
>>> 
>>> 
>> 
>> 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.
>> 
>> 
>> 
> 
> 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 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics