In a pile of discarded punch blanks, I found a few "diamond
tools". These are relatively short round shanks, roughly 1/2x2 inch,
with a ~2mm diamond embedded in the end.

I know that these are useful for wheel dressing, but is there any
other use of them? Are they useful for cutting glass?

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Ignoramus3107 wrote:
In a pile of discarded punch blanks, I found a few "diamond
tools". These are relatively short round shanks, roughly 1/2x2 inch,
with a ~2mm diamond embedded in the end.

I know that these are useful for wheel dressing, but is there any
other use of them? Are they useful for cutting glass?

No doubt you could dress them to a point and cut glass with
them, but the diamonds are pretty crude and might crumble.
They do a dandy job of dressing alumina wheels, though.

Jon

Ignoramus3107 writes:

I know that these are useful for wheel dressing, but is there any
other use of them?

Relative hardness testing. Make a dimple with it using a force on an
unknown sample and compare the same force dimple made in various known
samples.

On Sat, 26 Apr 2008 12:47:03 -0500, Ignoramus3107
wrote:

In a pile of discarded punch blanks, I found a few "diamond
tools". These are relatively short round shanks, roughly 1/2x2 inch,
with a ~2mm diamond embedded in the end.

I know that these are useful for wheel dressing, but is there any
other use of them? Are they useful for cutting glass?

Don't dismiss wheel dressing too quickly.

You like to weld on occasion. Welders and anglegrinders go together
like peanutbutter and jelly. I'm tawkin' fitup of course, not that
either of us would ever need to grind a weld ...

I discovered fairly recently that dressing an anglegrinder wheel can
make an absolutely amazing difference in performance. This includes
even the best wheels sold at my welding store. Things seem to be
slowing down some, I give the wheel a quick rake with a diamond and
the spark shower triples immediately hoo ah! I guess even the best
wheels can glaze if leaned on hard enough, dressing off the glaze gets
'em cutting like they should.

You like to weld on occasion. Welders and anglegrinders go together
like peanutbutter and jelly. I'm tawkin' fitup of course, not that
either of us would ever need to grind a weld ...
....
I discovered fairly recently that dressing an anglegrinder wheel can
make an absolutely amazing difference in performance. This includes
even the best wheels sold at my welding store. Things seem to be
slowing down some, I give the wheel a quick rake with a diamond and
the spark shower triples immediately hoo ah! I guess even the best
wheels can glaze if leaned on hard enough, dressing off the glaze gets
'em cutting like they should.

Hey, I learned something. Don't happen often anymore. I think I'll try a
wheel dresser though. Maybe compare to a diamond.

Karl "who does grind his welds" Townsend

On 2008-04-26, Richard J Kinch wrote:
Ignoramus3107 writes:

I know that these are useful for wheel dressing, but is there any
other use of them?

Relative hardness testing. Make a dimple with it using a force on an
unknown sample and compare the same force dimple made in various known
samples.

The standard diamond for that purpose is polished to a specific
angle cone, with a specific radius tip. And the usual practice is to
apply 5kg of force, zero the penetration meter, increase the force to a
specific value (which varies depending on the scale used), and then back
the force back down to 5kg and measure how far into the test sample the
point has moved. This is for several of the Rockwell hardness tests,
including the Rockwell C test.

there are some of the Rockwell tests which use a ball bearing of
a specific diameter instead, but the principle of use is similar. This
is more likely to be used for testing brass or something similar instead
of steel.

So -- if your diamonds are sharpened to a cone shape, with a
radiused tip, then they are probably used for such testing (but these
usually have a shoulder some distance behind the tip, while the stone
dressing ones don't, and are not likely to have nice smooth cones,
either. But they still could be used for comparative tests, even so.
And you can buy hardness standards used for checking the calibration
of the Rockwell hardness testers.

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
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On 2008-04-27, Don Foreman wrote:
On Sat, 26 Apr 2008 12:47:03 -0500, Ignoramus3107
wrote:

In a pile of discarded punch blanks, I found a few "diamond
tools". These are relatively short round shanks, roughly 1/2x2 inch,
with a ~2mm diamond embedded in the end.

I know that these are useful for wheel dressing, but is there any
other use of them? Are they useful for cutting glass?

Don't dismiss wheel dressing too quickly.

You like to weld on occasion. Welders and anglegrinders go together
like peanutbutter and jelly. I'm tawkin' fitup of course, not that
either of us would ever need to grind a weld ...

I discovered fairly recently that dressing an anglegrinder wheel can
make an absolutely amazing difference in performance. This includes
even the best wheels sold at my welding store. Things seem to be
slowing down some, I give the wheel a quick rake with a diamond and
the spark shower triples immediately hoo ah! I guess even the best
wheels can glaze if leaned on hard enough, dressing off the glaze gets
'em cutting like they should.

I even admit to, gasp, grinding bad welds!!!

Good idea Don. I tried one of them and was amazed at how these diamond
stand up to the wheels.

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Due to extreme spam originating from Google Groups, and their inattention
to spammers, I and many others block all articles originating
from Google Groups. If you want your postings to be seen by
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posting on Usenet.
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On Apr 27, 1:47*am, Ignoramus3107
wrote:
In a pile of discarded punch blanks, I found a few "diamondtools". These are relatively short round shanks, roughly 1/2x2 inch,
with a ~2mmdiamondembedded in the end.

I know that these are useful for wheel dressing, but is there any
other use of them? Are they useful for cutting glass?

--
* *Due to extreme spam originating from Google Groups, and their inattention
* * * to spammers, I and many others block all articles originating
* * * *from Google Groups. If you want your postings to be seen by
* * * * *more readers you will need to find a different means of
* * * * * * * * * * * *posting on Usenet.
* * * * * * * * * *http://improve-usenet.org/

www.xddiamond.com