Rubbing compound? Which one for ground glass?

"Nick Zentena" <zentena.TakeThisOut@hophead.dyndns.org> wrote in message news:bbunl1-lc6.ln1@barley.dyndns.org...
 > I'm likely going to order a scale from a jewellery supply house
 > [best price for the accuracy needed] they also sell quite a few different
 > compounds for polishing. I know somebody awhile back mentioned these could
 > be used for making a ground glass but which one? They've got a whole bunch
 > of rouge. Red,blue,green etc. They've got tripoli compound. Ruby powder.
 > Pumice powder. Too many choices.
 >
 > Thanks
 > Nick
 >

Someone else in this group mentioned they use 1,200 grit
silicon carbide, then I read the aluminum oxide is better,
with that I would get a very fine grit though I don't know
how fine it gets. Or better yet try to find the acid used for
etching glass, whatever it's called. Dangerous as all hell
I would suggest ...

Alex<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

There I knew it ...
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

David Nebenzahl <nobody DeleteThis @but.us.chickens> wrote:

 >
 > No, no, no: those are polishing compounds. Much too fine. You'll end up with
 > polished glass.
 >
 > What you want is *grinding* powder. Simple silicon carbide powder is all. I
 > use 1200 grit to get a finer ground glass than most. You can get this stuff in
 > grits from less than 80 (too coarse) all the way up to 4000 or more.
 >
 > Just for reference, ordinary valve grinding compound (silicon carbide in paste
 > form) is about 220 grit, which makes adequate ground glass, if a little
 > coarse. I'd recommend 400 or finer. Buy a couple different grits and
 > experiment. At 5 minutes max. per piece of glass, not a big investment in time.


They've only got silicon carbide on wheels. I guess I'll go with the valve
compound.

  Thanks
  Nick<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

AArDvarK wrote:
 > "Nick Zentena" <zentena RemoveThis @hophead.dyndns.org> wrote in message
 > news:bbunl1-lc6.ln1@barley.dyndns.org...
 >
  >> I'm likely going to order a scale from a jewellery supply house
  >> [best price for the accuracy needed] they also sell quite a few
  >> different compounds for polishing. I know somebody awhile back
  >> mentioned these could be used for making a ground glass but which
  >> one? They've got a whole bunch of rouge. Red,blue,green etc.
  >> They've got tripoli compound. Ruby powder. Pumice powder. Too many
  >> choices.
  >>
  >> Thanks Nick
  >>
 >
 >
 > Someone else in this group mentioned they use 1,200 grit silicon
 > carbide, then I read the aluminum oxide is better, with that I would
 > get a very fine grit though I don't know how fine it gets. Or better
 > yet try to find the acid used for etching glass, whatever it's
 > called. Dangerous as all hell I would suggest ...
 >
Hydrofluoric acid. If you insist, try, instead a solution of ammonium
bifluoride in water. Since you do not want both sides etched, coat one
side with paraffin first. Of course it may be some trouble getting it
off first. Ammonium bifluoride in water is not something to put your
hands in either.

It seems to me it would be a lot easier to just buy a ground glass.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ Registered Machine 241939.
/( )\ Shrewsbury, New Jersey <a style='text-decoration: underline;' href="http://counter.li.org" target="_blank">http://counter.li.org</a>
^^-^^ 14:20:00 up 15:02, 4 users, load average: 4.49, 4.16, 4.04<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

Go down to your favorite auto supply house and get a tube of valve
grinding compound. Last one I bought was $1.59. Use that.

Regards,

Marv

Nick Zentena wrote:
  > I'm likely going to order a scale from a jewellery supply house
 > [best price for the accuracy needed] they also sell quite a few different
 > compounds for polishing. I know somebody awhile back mentioned these could
 > be used for making a ground glass but which one? They've got a whole bunch
 > of rouge. Red,blue,green etc. They've got tripoli compound. Ruby powder.
 > Pumice powder. Too many choices.
 >
 > Thanks
 > Nick
 >
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

On 4/23/2004 11:21 AM Nick Zentena spake thus:

 > David Nebenzahl <nobody DeleteThis @but.us.chickens> wrote:
 >
  >> No, no, no: those are polishing compounds. Much too fine. You'll end up with
  >> polished glass.
  >>
  >> What you want is *grinding* powder. Simple silicon carbide powder is all. I
  >> use 1200 grit to get a finer ground glass than most. You can get this stuff in
  >> grits from less than 80 (too coarse) all the way up to 4000 or more.
  >>
  >> Just for reference, ordinary valve grinding compound (silicon carbide in paste
  >> form) is about 220 grit, which makes adequate ground glass, if a little
  >> coarse. I'd recommend 400 or finer. Buy a couple different grits and
  >> experiment. At 5 minutes max. per piece of glass, not a big investment in time.
 >
 > They've only got silicon carbide on wheels. I guess I'll go with the valve
 > compound.

Don't know who "they" are: your local hardware store? No surprise. However,
the stuff *is* available. Here's one supplier found with a few minute's
googling (500 grit):

<a style='text-decoration: underline;' href="http://www.tools-plus.com/h-dsc500.html" target="_blank">http://www.tools-plus.com/h-dsc500.html</a>

I bought mine at a Japanese woodworking supply store in Berkeley (Hida Tool,
<a style='text-decoration: underline;' href="http://www.hidatool.com" target="_blank">http://www.hidatool.com</a>), so I know they have it in several grits, including
some much finer than the 1200 grit I got, but I can't find it on their
website. You could give them a call; they're very nice people. Or you should
be able to find it from a large woodworker's supply place.

The valve grinding stuff'll work, but as someone else pointed out, it's pretty
coarse. You can do better.


--
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- Cynical shop talk from comp.publish.prepress<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

On Fri, 23 Apr 2004 14:25:34 -0400, Jean-David Beyer
<jdbeyer.DeleteThis@exit109.com> wrote:

 >Since you do not want both sides etched, coat one
 >side with paraffin first. Of course it may be some trouble getting it
 >off first.

  Microwave ? Hot water ?


Regards,

John S. Douglas, Photographer - <a style='text-decoration: underline;' href="http://www.darkroompro.com" target="_blank">http://www.darkroompro.com</a>
Please remove the "_" when replying via email<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

On Fri, 23 Apr 2004 11:54:35 -0500, Nick Zentena
<zentena DeleteThis @hophead.dyndns.org> wrote:

  > I'm likely going to order a scale from a jewellery supply house
 >[best price for the accuracy needed] they also sell quite a few different
 >compounds for polishing. I know somebody awhile back mentioned these could
 >be used for making a ground glass but which one? They've got a whole bunch
 >of rouge. Red,blue,green etc. They've got tripoli compound. Ruby powder.
 >Pumice powder. Too many choices.
 >
 > Thanks
 > Nick

  Try 800 grit emery cloth.


Regards,

John S. Douglas, Photographer - <a style='text-decoration: underline;' href="http://www.darkroompro.com" target="_blank">http://www.darkroompro.com</a>
Please remove the "_" when replying via email<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

 >Go down to your favorite auto supply house and get a tube of valve
 >grinding compound. Last one I bought was $1.59. Use that.
 >

I used regular valve grinding compound and found it to be WAY TOO COARSE...
I don't recommend it at all... I couldn't see what I was trying to focus on,
and a loupe made it worse!!

Doug<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

"Nick Zentena" <zentena DeleteThis @hophead.dyndns.org> wrote

 > I'm likely going to ... a jewellery supply house ... they also sell
 > ... compounds for polishing ... ground glass but which one?

The Auto parts store carries 'Rubbing Compound' and 'Polishing
Compound'. Rubbing compound is white and is used for removing
scratches from auto paint - it leaves behind a 'scoured' surface.
Polishing compound is red and is used to polish a rubbed area to
a high shine (or to try and shine dull auto paint).

I would use the white rubbing compound. My 1 lb tin says $1.50
on it, but it is most likely 30+ years old. Anyway the stuff
is cheap, and if it doesn't work the way you want on glass, you
can always use it on your car.

Valve grinding compound is for _grinding_ metal, wouldn't advise.

--
Nicholas O. Lindan, Cleveland, Ohio nolindan DeleteThis @ix.netcom.com
Consulting Engineer: Electronics; Informatics; Photonics.
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

On 4/24/2004 7:00 AM Nicholas O. Lindan spake thus:

 > "Nick Zentena" <zentena.RemoveThis@hophead.dyndns.org> wrote
 >
  >> I'm likely going to ... a jewellery supply house ... they also sell
  >> ... compounds for polishing ... ground glass but which one?
 >
 > The Auto parts store carries 'Rubbing Compound' and 'Polishing
 > Compound'. Rubbing compound is white and is used for removing
 > scratches from auto paint - it leaves behind a 'scoured' surface.
 > Polishing compound is red and is used to polish a rubbed area to
 > a high shine (or to try and shine dull auto paint).
 >
 > I would use the white rubbing compound. My 1 lb tin says $1.50
 > on it, but it is most likely 30+ years old. Anyway the stuff
 > is cheap, and if it doesn't work the way you want on glass, you
 > can always use it on your car.
 >
 > Valve grinding compound is for _grinding_ metal, wouldn't advise.

Wrong again.

Valve grinding compound (which is indeed made for grinding metal) is *exactly*
what you should use to make ground glass. (Though as I've pointed out, too ma
ny times, it's a little on the coarse side.) "Rubbing compound" (aka polishing
compound) is for just that--polishing--and will not produce a ground surface,
no matter how hard or long you rub.


--
I was quickly apprised that an "RSS feed" was not, as I had naively
imagined, some new and unspeakable form of sexual debauchery practised
by young persons of dubious morality, but a way of providing news
articles to the cybernetic publishing moguls of the World Wide Wait so
they can fill the airwaves with even more useless drivel.

- Cynical shop talk from comp.publish.prepress<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

 > Hydrofluoric acid. If you insist, try, instead a solution of ammonium
 > bifluoride in water. Since you do not want both sides etched, coat one
 > side with paraffin first. Of course it may be some trouble getting it
 > off first. Ammonium bifluoride in water is not something to put your
 > hands in either.
 >
 > It seems to me it would be a lot easier to just buy a ground glass.
 >
 > --
 > .~. Jean-David Beyer Registered Linux User 85642.
 > /V\ Registered Machine 241939.
<font color=purple> > /( )\ Shrewsbury, New Jersey <a style='text-decoration: underline;' href="http://counter.li.org</font" target="_blank">http://counter.li.org</font</a>>
 > ^^-^^ 14:20:00 up 15:02, 4 users, load average: 4.49, 4.16, 4.04
 >

You might want to try one of the glass etching kits that are sometimes
available in art and craft stores. I don't have any to recommend, but you
might check around.

KB<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass? 

Ken Burns wrote:

 >
 > You might want to try one of the glass etching kits that are sometimes
 > available in art and craft stores. I don't have any to recommend, but you
 > might check around.
 >
 > KB
 >
 >

This doesn't work very well. I tried numerous techniques. No matter
what I did, the results were uneven. I took the samples to the local
"art glass" people. They said, "Wow, that's much better than we could
do." But it wasn't near good enough. Either find the appropriate
powdered abrasive, or buy good quality ground glass. It's really not
very expensive. Valve grinding compound makes a crappy ground glass.

-Peter<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rubbing compound? Which one for ground glass?