RE: [Cameramakers] Re: Ground glass
There are several suppliers on the web. Try a search on google. Mike > -Original Message- > From: [EMAIL PROTECTED] > [mailto:cameramakers-admin@;rosebud.opusis.com] On Behalf Of > Kenith Ryan > Sent: Sunday, October 27, 2002 10:57 PM > To: [EMAIL PROTECTED] > Subject: [Cameramakers] Re: Ground glass > > > Jahn, the phone book was the first place that I looked. > There is no listing for lapidary supplies or anything > remotely resembling it. Jake, thanks for the offer. If I > can't find it anywhere else I may take you up on your offer. > > Kenith Ryan > > > ___ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameram> akers > ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Ground glass
Jahn, the phone book was the first place that I looked. There is no listing for lapidary supplies or anything remotely resembling it. Jake, thanks for the offer. If I can't find it anywhere else I may take you up on your offer. Kenith Ryan ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Re: Ground glass
I have a local lapadary store that sells carborundum 500 & 600 grit. I purchased half a pound a few years back for about 6 or 7 dollars (if i remember correctly). You could check the phone book for a local store... Or, I can offer the service of buying some and sending it your way at cost + shipping. I'm not sure what postage would cost. You can look it up using my zip code 85704. The easiest way for me to send something is through the USPS. The stuff works great for making ground glass. Jake Boen --- Kenith Ryan <[EMAIL PROTECTED]> wrote: > Thanks for your input, Jahn. The abrasives that > seem to give the best > consistent results, from what I have read are > levigated alumina and > carborundum. I have found a couple of online sources > for the levigated > alumina but they have a minimum order of $25. It > only costs $3.30 a pound > and I don't think that i could ever use $25 worth in > a lifetime. If no one > here can tell me somewhere that doesn't have a > minimum order though, I may > end up ordering from them and geting several > different types of abbrasive to > experiment and see if something works better. > > Kenith Ryan > > > > If you can find a stained glass supply house, they > sell an acid for > > etching glass that does the trick very nicely. The > biggest trick with it > > is spreading it evenly on the glass - a glass rod > worked well for 4x5 > > size. The acid etched glass is a little brighter > than the abrasive > > ground, but a little trickier to pull focus. A > good 4 or 6 power loop > > really helps. > > > > Jahn > > > ___ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameramakers __ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/ ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Re: Ground glass
Kenith, Check your phone book for a lapidary supply in your area. They will carry the carborundum abrasives and should have them available in smaller quantities. Good luck! Jahn ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Ground glass
Thanks for your input, Jahn. The abrasives that seem to give the best consistent results, from what I have read are levigated alumina and carborundum. I have found a couple of online sources for the levigated alumina but they have a minimum order of $25. It only costs $3.30 a pound and I don't think that i could ever use $25 worth in a lifetime. If no one here can tell me somewhere that doesn't have a minimum order though, I may end up ordering from them and geting several different types of abbrasive to experiment and see if something works better. Kenith Ryan > If you can find a stained glass supply house, they sell an acid for > etching glass that does the trick very nicely. The biggest trick with it > is spreading it evenly on the glass - a glass rod worked well for 4x5 > size. The acid etched glass is a little brighter than the abrasive > ground, but a little trickier to pull focus. A good 4 or 6 power loop > really helps. > > Jahn ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] re: ground glass
Here is another way to make good ground glass, if you dont have access to a sandblaster. get some carbide grinding paste froma garage and polish it whith that takes some time but is quite easy. Hope this helps Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Ground Glass
One possible cause of uneven etching might be insufficient cleaning. Grime on the glass surface can cause parts of the glass to begin etching only later because the etching compound had to work through local regions of "grease-like" "resist"! Persons making high quality optics give a lot of attention to cleaning. Try scrubbing well and maybe even give the glass a soak in a moderate strength lye solution (which in itself can attack glass, but which also destroys grease.) The other proposal to take seriously is Sandy King's idea that the etching mixture was not well mixed. When cleaning, after the last rinse notice whether the water wets the glass with a nice uniform and thin layer. It not, clean some more! It is probably best to begin etching after shaking off as much rinse water as possible but before the glass dries, especially if distilled water is not being used. Bob Dr. Robert Mueller Institut für Festkörperforschung, FZ-Juelich D-52425 Juelich, Germany phone: + 49 2461 61 4550 FAX: + 49 2461 61 2610 email: [EMAIL PROTECTED] ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
RE: [Cameramakers] Re: ground glass
The abrasive should be in a powder format, not sandpaper. Place a few drops of water and abrasive between two pieces of glass and rub the surfaces together in a random orbit. The abrasive can be purchased at your local lapadary store (jewerly supply). 500 grit works fine as well. 1/2 a pound will last you many years to come. Jake -- Original Message -- >Use 600 grit abrasive and a brass or copper lap to make ground glass, this >gives >a nice fine screen even when looked at through a loupe. >This only takes a few minutes to do, wash and check the glass surface as >you go. > > > Mike > >___ >Cameramakers mailing list >[EMAIL PROTECTED] >http://rmp.opusis.com/mailman/listinfo/cameramakers > ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: ground glass
Use 600 grit abrasive and a brass or copper lap to make ground glass, this gives a nice fine screen even when looked at through a loupe. This only takes a few minutes to do, wash and check the glass surface as you go. Mike ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
