Rockwell hardness

[tricker]

i know this isn't really the place for this, but i don't know where is......but what is the rockwell hardness of a typical diamond?

 

[huugh]

What is the height of Empire State Building in Fahrenheits?

 

[shecky]

What a helpful reply.

Anyone have any reasonable answer to the OP?

 

[Bastid]

Moved to gadgets and gear since there is no knife content here.

 

[bh49]

What is the height of Empire State Building in Fahrenheits?

If I understand correctly, huugh is trying to say that you can not test diamond hardness on Rockwell scale. Max on Rc scale is 80 and I believe that diamonds are much harder than this.

 

[Bastid]

The problem here is that most Rockwell hardness testers use a diamond cone to determine the hardness. So a ventured guess is that the hardness of a diamond is off the Rockwell scale.

Just a guess though, but google can be your friend if you wish to research.

 

[yoda4561]

The hardness of a diamond is beyond the measurement range of the rockwell C scale. About the best anyone could do is "guesstimate" because there is no real value. Diamonds and other hard crystals use the Moh's scale on which diamond is a 10, there is no way to convert moh's to rockwell.

 

[bh49]

Some useful info
http://www.24carat.co.uk/hardnessmohsscaleframe.html

 

[tricker]

for anyone who cares...this is what i got from the materials engineer professor here at UTk
>===== Original Message From "Carl J. McHargue" <crl@utk.edu> =====
The Rockwell hardness measurements do not go as high as diamond.
They stop at about Topaz or 8 on the Mohs scale whereas diamond is
10. Of course, the Mohs scale is not linear. A Brinell hardness of
about 10,000 would correspond to diamond. A Rockwell C hardness of 80
would correspond to about 1,000 on the Brinell scale. Again the
scales have an approximate log relationship.

Hope this helps.

Carl McHargue

 

[tricker]

What is the height of Empire State Building in Fahrenheits?

if my question made no sense, i assure you your answer made less(which i assume is what you where going for, you got a 0 on the funny scale).......my question wasn't a unit issue...it was a test issue

 

[ahgar]

I'm probably wrong but it seems like i remember something about a diamond being 100 on the rockwell scale. can't remember where but that's what was said. don't bet any money on it or anything.

 

[kjbenner]

Here's a figure from an MSE book (Materials Science and Engineering: an Introduction, William D. Mcallister, Jr.)

Sorry it scanned so poorly, hopefully you can read it well enough.

 

[richard j]

tricker, send me an email. rje196021@gmail.com

 

[renomaverick]

Done!