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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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Cutting thin tiny glass parts
Not exactly metalworking. I needed to make a replacement glass piece
for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric |
#2
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Cutting thin tiny glass parts
On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote:
Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? |
#3
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Cutting thin tiny glass parts
On Thu, 30 Apr 2015 15:57:05 -0700 (PDT), Gerry
wrote: On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote: Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? Greetings Gerry, I have done lapidary work and even have the stuff still to do it. My stone saw is just not set up to cut stuff so small and the glass is more brittle than the stones I have cut in the past. I did finish off the piece by using one of my diamond wheels on my slow speed carbide grinding/lapping machine. I was actually surprised at how fragile the glass was. I have cut glass tiles in the past year with one of my diamond cutting discs cooled and lubricated with water and had no trouble. But the little pieces I just did were much more prone to chipping and cracking than the tiles and the diamond cutting disc caused too much edge chipping, even when run quite slow. Thanks, Eric |
#4
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Cutting thin tiny glass parts
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#5
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Cutting thin tiny glass parts
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#6
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Cutting thin tiny glass parts
On Thursday, April 30, 2015 at 3:25:46 PM UTC-7, wrote:
Not exactly metalworking. I needed to make a replacement glass piece ...for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to The usual scheme, is to rotate a brass or copper cylinder tool, painted with abrasive slurry, and trepan out a disk. A kind of hotmelt glue (jeweler's wax, or dop adhesive) holds the work. It's slow, because the glass will crack if you allow the cut to heat it too much. I've done it with a tinning swab, a few drops of glycerine, and SiC grit. |
#7
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Cutting thin tiny glass parts
On 01-May-15 10:41 AM, whit3rd wrote:
On Thursday, April 30, 2015 at 3:25:46 PM UTC-7, wrote: Not exactly metalworking. I needed to make a replacement glass piece ...for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I managed to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to The usual scheme, is to rotate a brass or copper cylinder tool, painted with abrasive slurry, and trepan out a disk. A kind of hotmelt glue (jeweler's wax, or dop adhesive) holds the work. It's slow, because the glass will crack if you allow the cut to heat it too much. I've done it with a tinning swab, a few drops of glycerine, and SiC grit. Out of interest why brass or copper? Does the abrasive embed in it? |
#8
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Cutting thin tiny glass parts
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#10
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Cutting thin tiny glass parts
On Thu, 30 Apr 2015 19:41:59 -0700 (PDT), whit3rd
wrote: On Thursday, April 30, 2015 at 3:25:46 PM UTC-7, wrote: Not exactly metalworking. I needed to make a replacement glass piece ...for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to The usual scheme, is to rotate a brass or copper cylinder tool, painted with abrasive slurry, and trepan out a disk. A kind of hotmelt glue (jeweler's wax, or dop adhesive) holds the work. It's slow, because the glass will crack if you allow the cut to heat it too much. I've done it with a tinning swab, a few drops of glycerine, and SiC grit. I have done this. I needed a smaller diameter achromat so I used a wax chuck to hold the lens. The saw was a bronze cylinder and the abrasive was diamond. When I was done I had the smaller dia. lens and a ring of glass. Too bad I dropped the ring before I had a chance to show it to anybody. But the lens worked great. But the glass piece I needed for this camera is rectangular, there is a cutout it fits in and a couple gaskets to seal it and the sensor from dust. Eric |
#11
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Cutting thin tiny glass parts
On Fri, 01 May 2015 19:43:58 +0800, RodK wrote:
On 01-May-15 10:41 AM, whit3rd wrote: On Thursday, April 30, 2015 at 3:25:46 PM UTC-7, wrote: Not exactly metalworking. I needed to make a replacement glass piece ...for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I managed to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to The usual scheme, is to rotate a brass or copper cylinder tool, painted with abrasive slurry, and trepan out a disk. A kind of hotmelt glue (jeweler's wax, or dop adhesive) holds the work. It's slow, because the glass will crack if you allow the cut to heat it too much. I've done it with a tinning swab, a few drops of glycerine, and SiC grit. Out of interest why brass or copper? Does the abrasive embed in it? Yes, the abrasive does imbed. I make laps for carbide from brass. After the lap is turned to size I press diamond dust into the brass. It really works quite well. For the saw I used to make a smaller achromat I put the abrasive on a piece of hardened steel and pushed (hard) the cutting edge of the saw into the diamond. Eric |
#12
Posted to rec.crafts.metalworking
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Cutting thin tiny glass parts
On Fri, 01 May 2015 08:33:36 -0700, wrote:
On Thu, 30 Apr 2015 21:42:45 -0400, Ed Huntress wrote: On Thu, 30 Apr 2015 18:16:06 -0700, wrote: On Thu, 30 Apr 2015 15:57:05 -0700 (PDT), Gerry wrote: On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote: Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? Greetings Gerry, I have done lapidary work and even have the stuff still to do it. My stone saw is just not set up to cut stuff so small and the glass is more brittle than the stones I have cut in the past. I did finish off the piece by using one of my diamond wheels on my slow speed carbide grinding/lapping machine. I was actually surprised at how fragile the glass was. I have cut glass tiles in the past year with one of my diamond cutting discs cooled and lubricated with water and had no trouble. But the little pieces I just did were much more prone to chipping and cracking than the tiles and the diamond cutting disc caused too much edge chipping, even when run quite slow. Thanks, Eric Oh, yeah, I forgot to mention that there are fused-quartz slides, too. You generally can't tell the difference by looking at them and you'd know it if you bought them in a package. They have very high UV transmittance but I have no idea how they cut. I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why two pieces of glass were cemented together and I thought maybe it was for strength. But I think it is because the clear piece of glass is to filter out UV. This would be good because CCD sensors also see into the UV spectrum a ways and I would like to get some pictures of reflected UV from flowers and such. Tonight I will be installing the glass and doing any adjusting of the sensor location that may need to be done. Tomorrow night I hope it will all be back tohether so I can try it out at a bonfire. Eric Good luck. I never priced the quartz slides before but I just looked them up -- which I should have done before posting. Yipes, they're expensive. I see that they're also said to be available in borosilicate glass (the stuff old Pyrex was made from -- today, it's tempered soda lime glass), but I didn't look for a supplier. Borosilicate is still another kettle of fish. -- Ed Huntress |
#13
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Cutting thin tiny glass parts
On 01/05/15 20:26, Ed Huntress wrote:
On Fri, 01 May 2015 08:33:36 -0700, wrote: On Thu, 30 Apr 2015 21:42:45 -0400, Ed Huntress wrote: On Thu, 30 Apr 2015 18:16:06 -0700, wrote: On Thu, 30 Apr 2015 15:57:05 -0700 (PDT), Gerry wrote: On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote: Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? Greetings Gerry, I have done lapidary work and even have the stuff still to do it. My stone saw is just not set up to cut stuff so small and the glass is more brittle than the stones I have cut in the past. I did finish off the piece by using one of my diamond wheels on my slow speed carbide grinding/lapping machine. I was actually surprised at how fragile the glass was. I have cut glass tiles in the past year with one of my diamond cutting discs cooled and lubricated with water and had no trouble. But the little pieces I just did were much more prone to chipping and cracking than the tiles and the diamond cutting disc caused too much edge chipping, even when run quite slow. Thanks, Eric Oh, yeah, I forgot to mention that there are fused-quartz slides, too. You generally can't tell the difference by looking at them and you'd know it if you bought them in a package. They have very high UV transmittance but I have no idea how they cut. I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why two pieces of glass were cemented together and I thought maybe it was for strength. But I think it is because the clear piece of glass is to filter out UV. This would be good because CCD sensors also see into the UV spectrum a ways and I would like to get some pictures of reflected UV from flowers and such. Tonight I will be installing the glass and doing any adjusting of the sensor location that may need to be done. Tomorrow night I hope it will all be back tohether so I can try it out at a bonfire. Eric Good luck. I never priced the quartz slides before but I just looked them up -- which I should have done before posting. Yipes, they're expensive. I see that they're also said to be available in borosilicate glass (the stuff old Pyrex was made from -- today, it's tempered soda lime glass), but I didn't look for a supplier. Borosilicate is still another kettle of fish. I posted this before, apparently Pyrex is still made with borosilicate in Europe, it seems the US made stuff is tempered soda lime glass, I guess to reduce the price. Certainly all the Pyrex I have here in the UK is clear and doesn't have the green cast often seen in soda lime from iron and when dropped doesn't break like a tempered glass DAMHIK. |
#14
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Cutting thin tiny glass parts
On Fri, 01 May 2015 20:46:59 +0100, David Billington
wrote: On 01/05/15 20:26, Ed Huntress wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: On Thu, 30 Apr 2015 21:42:45 -0400, Ed Huntress wrote: On Thu, 30 Apr 2015 18:16:06 -0700, wrote: On Thu, 30 Apr 2015 15:57:05 -0700 (PDT), Gerry wrote: On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote: Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? Greetings Gerry, I have done lapidary work and even have the stuff still to do it. My stone saw is just not set up to cut stuff so small and the glass is more brittle than the stones I have cut in the past. I did finish off the piece by using one of my diamond wheels on my slow speed carbide grinding/lapping machine. I was actually surprised at how fragile the glass was. I have cut glass tiles in the past year with one of my diamond cutting discs cooled and lubricated with water and had no trouble. But the little pieces I just did were much more prone to chipping and cracking than the tiles and the diamond cutting disc caused too much edge chipping, even when run quite slow. Thanks, Eric Oh, yeah, I forgot to mention that there are fused-quartz slides, too. You generally can't tell the difference by looking at them and you'd know it if you bought them in a package. They have very high UV transmittance but I have no idea how they cut. I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why two pieces of glass were cemented together and I thought maybe it was for strength. But I think it is because the clear piece of glass is to filter out UV. This would be good because CCD sensors also see into the UV spectrum a ways and I would like to get some pictures of reflected UV from flowers and such. Tonight I will be installing the glass and doing any adjusting of the sensor location that may need to be done. Tomorrow night I hope it will all be back tohether so I can try it out at a bonfire. Eric Good luck. I never priced the quartz slides before but I just looked them up -- which I should have done before posting. Yipes, they're expensive. I see that they're also said to be available in borosilicate glass (the stuff old Pyrex was made from -- today, it's tempered soda lime glass), but I didn't look for a supplier. Borosilicate is still another kettle of fish. I posted this before, apparently Pyrex is still made with borosilicate in Europe, it seems the US made stuff is tempered soda lime glass, I guess to reduce the price. Right. We can get the borosilicate cookware, but my recollection is that it's imported from Europe. The Pyrex cookware usually sold in the US is now tempered soda lime glass. Certainly all the Pyrex I have here in the UK is clear and doesn't have the green cast often seen in soda lime from iron and when dropped doesn't break like a tempered glass DAMHIK. Iggy had a bad experience with a relatively new Pyrex baking dish. It shattered in the oven. I'm hanging on to my old stuff, some of which dates back to the '60s. -- Ed Huntress |
#15
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Cutting thin tiny glass parts
In article , Ed Huntress
wrote: On Fri, 01 May 2015 20:46:59 +0100, David Billington wrote: On 01/05/15 20:26, Ed Huntress wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: On Thu, 30 Apr 2015 21:42:45 -0400, Ed Huntress wrote: On Thu, 30 Apr 2015 18:16:06 -0700, wrote: On Thu, 30 Apr 2015 15:57:05 -0700 (PDT), Gerry wrote: On Thursday, April 30, 2015 at 5:25:46 PM UTC-5, wrote: Not exactly metalworking. I needed to make a replacement glass piece for a camera because I removed the IR/UV filter and the space needed filling for proper focusing. I used a 1mm glass slide, the type made for microscopes. The piece needed to be 8 x 9 mm. I mamaged to get one and then discovered I had scratched it. So I tried again and was rewarded with a scratch free piece. I was surprised how hard it was to cut this glass, for it to break where I wanted it to, and finally figured out how to score it properly. I hope I never need to do this again. Eric Years ago I did lapidary work. While most everything was done with stone I used to play with glass sometimes. I was able to cut glass with a diamond saw, grind to shape using grinding and sanding wheels with water drip to keep things cool. The glass was mounted to dop sticks using what was called dop wax which was almost like old style sealing wax used with stamps for letters and such. Maybe you can find someone close by that is into lapidary work for help? A designing jeweler may point you in the right direction. I'd bet that your local glass shop has wet belt sanders with different grit belts for finishing glass edges. Maybe they would let you use their belt sanders for your project? Greetings Gerry, I have done lapidary work and even have the stuff still to do it. My stone saw is just not set up to cut stuff so small and the glass is more brittle than the stones I have cut in the past. I did finish off the piece by using one of my diamond wheels on my slow speed carbide grinding/lapping machine. I was actually surprised at how fragile the glass was. I have cut glass tiles in the past year with one of my diamond cutting discs cooled and lubricated with water and had no trouble. But the little pieces I just did were much more prone to chipping and cracking than the tiles and the diamond cutting disc caused too much edge chipping, even when run quite slow. Thanks, Eric Oh, yeah, I forgot to mention that there are fused-quartz slides, too. You generally can't tell the difference by looking at them and you'd know it if you bought them in a package. They have very high UV transmittance but I have no idea how they cut. I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why two pieces of glass were cemented together and I thought maybe it was for strength. But I think it is because the clear piece of glass is to filter out UV. This would be good because CCD sensors also see into the UV spectrum a ways and I would like to get some pictures of reflected UV from flowers and such. Tonight I will be installing the glass and doing any adjusting of the sensor location that may need to be done. Tomorrow night I hope it will all be back tohether so I can try it out at a bonfire. Eric Good luck. I never priced the quartz slides before but I just looked them up -- which I should have done before posting. Yipes, they're expensive. I see that they're also said to be available in borosilicate glass (the stuff old Pyrex was made from -- today, it's tempered soda lime glass), but I didn't look for a supplier. Borosilicate is still another kettle of fish. I posted this before, apparently Pyrex is still made with borosilicate in Europe, it seems the US made stuff is tempered soda lime glass, I guess to reduce the price. Right. We can get the borosilicate cookware, but my recollection is that it's imported from Europe. The Pyrex cookware usually sold in the US is now tempered soda lime glass. Yes. The "Pyrex" brand fell into the wrong hands after Corning nearly died when the dot-com bubble burst, and was selling off "non-core" businesses. The new company is busily destroying the Pyrex brand. Certainly all the Pyrex I have here in the UK is clear and doesn't have the green cast often seen in soda lime from iron and when dropped doesn't break like a tempered glass DAMHIK. Iggy had a bad experience with a relatively new Pyrex baking dish. It shattered in the oven. I'm hanging on to my old stuff, some of which dates back to the '60s. Iggy is not alone. Lots of horror stories on the web now. There are now people selling borosilicate glassware, by that name, And I'm hanging onto my old stuff too. Joe Gwinn |
#16
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Cutting thin tiny glass parts
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#17
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Cutting thin tiny glass parts
On 2015-06-10, Gray_Wolf wrote:
On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. The problem with the quartz used in frequency-determining crystals is that they are ground to thickness, and thus have a frosted look, not a nice flat surface to allow it to act as a window/filter for images. The older ones are mounted between two metal plates which make contact only at the corners, with a spring applying pressure to the upper plate. Later ones have metalized surfaces on each side, with a spring-formed wire soldered to the center of each. There, even if the surface were flat enough for optical image transmission, you would have to dissolve the metal coating with an acid which would attack the metal without attacking the quartz. And -- the largest that I have ever seen was about 1/2" square, which is not likely to be large enough for the sensor in question. (Well ... I've never opened the two inch long can for a 1 KHz crystal which I have, but it still would not be wide enough, even if it were long enough. Good Luck, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#18
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Cutting thin tiny glass parts
On 11 Jun 2015 03:11:05 GMT, "DoN. Nichols"
wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. If you want optical quality windows go to newport.com They sell parallel surface windows made from all known optical materials. There are many other scientific optics sources on the Internet. |
#19
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Cutting thin tiny glass parts
May not be large enough but how about the quartz windows on old UV eraseable
EPROMs? Have to dig it out of the epoxy, but I'm sure lots of shops and tinkerers have some stuck away in a junk drawer. ----- Regards, Carl Ijames wrote in message ... On 11 Jun 2015 03:11:05 GMT, "DoN. Nichols" wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. If you want optical quality windows go to newport.com They sell parallel surface windows made from all known optical materials. There are many other scientific optics sources on the Internet. |
#20
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Cutting thin tiny glass parts
On Thu, 11 Jun 2015 09:10:47 -0400, "Carl Ijames"
wrote: May not be large enough but how about the quartz windows on old UV eraseable EPROMs? Have to dig it out of the epoxy, but I'm sure lots of shops and tinkerers have some stuck away in a junk drawer. ----- Regards, Carl Ijames wrote in message ... On 11 Jun 2015 03:11:05 GMT, "DoN. Nichols" wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. If you want optical quality windows go to newport.com They sell parallel surface windows made from all known optical materials. There are many other scientific optics sources on the Internet. Greetings Carl, I didn't know the windows on EPROMs were quartz but it makes sense. The ones I have though are too small. Fortunately the glass lenses in my camera let through a pretty significant amount of near UV. Just like window glass. Hence the internal two piece filter between the lens and sensor in my camera. This near UV passing through normal camera lenses is also the reason for the UV/Haze camera filters. Eric |
#21
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Cutting thin tiny glass parts
I have a really neat xtal - lots of RF ones, but a 2.0000 KHz.
It is a tight tolerance Audio grade. Kinda neat. I haven't taken it apart - I want the 2k as is - but wonder the design - long I suppose. But more than one xtal ? Is it filtered or just finely ground to audio tone generator. Saws are used to fine tune and trim - in RF. Martin On 6/10/2015 10:11 PM, DoN. Nichols wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. The problem with the quartz used in frequency-determining crystals is that they are ground to thickness, and thus have a frosted look, not a nice flat surface to allow it to act as a window/filter for images. The older ones are mounted between two metal plates which make contact only at the corners, with a spring applying pressure to the upper plate. Later ones have metalized surfaces on each side, with a spring-formed wire soldered to the center of each. There, even if the surface were flat enough for optical image transmission, you would have to dissolve the metal coating with an acid which would attack the metal without attacking the quartz. And -- the largest that I have ever seen was about 1/2" square, which is not likely to be large enough for the sensor in question. (Well ... I've never opened the two inch long can for a 1 KHz crystal which I have, but it still would not be wide enough, even if it were long enough. Good Luck, DoN. |
#22
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Cutting thin tiny glass parts
Always get sapphire window. More common than thought.
Many cell phones are sapphire and many chemical ports are. I have some myself. Most is broken flats and I have at least one nice one. Martin On 6/11/2015 8:10 AM, Carl Ijames wrote: May not be large enough but how about the quartz windows on old UV eraseable EPROMs? Have to dig it out of the epoxy, but I'm sure lots of shops and tinkerers have some stuck away in a junk drawer. ----- Regards, Carl Ijames wrote in message ... On 11 Jun 2015 03:11:05 GMT, "DoN. Nichols" wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. If you want optical quality windows go to newport.com They sell parallel surface windows made from all known optical materials. There are many other scientific optics sources on the Internet. |
#23
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Cutting thin tiny glass parts
In article ,
wrote: On Thu, 11 Jun 2015 09:10:47 -0400, "Carl Ijames" wrote: May not be large enough but how about the quartz windows on old UV eraseable EPROMs? Have to dig it out of the epoxy, but I'm sure lots of shops and tinkerers have some stuck away in a junk drawer. ----- Regards, Carl Ijames wrote in message ... On 11 Jun 2015 03:11:05 GMT, "DoN. Nichols" wrote: On 2015-06-10, Gray_Wolf wrote: On Fri, 01 May 2015 08:33:36 -0700, wrote: [Snip] I wish they were quartz because of the toughness and UV transmission. The filter I removed was a two piece affair. At first I wondered why [ ... ] Perhaps a source of quarts flats would from quartz crystals used in electronic devices. e.g. RF oscillators, computer clock control and such. I think CCD sensors are more sensitive to IR than UV. In any case UV doesn't transmit well through regular glass lens. If you want optical quality windows go to newport.com They sell parallel surface windows made from all known optical materials. There are many other scientific optics sources on the Internet. Greetings Carl, I didn't know the windows on EPROMs were quartz but it makes sense. The ones I have though are too small. Fortunately the glass lenses in my camera let through a pretty significant amount of near UV. Just like window glass. Hence the internal two piece filter between the lens and sensor in my camera. This near UV passing through normal camera lenses is also the reason for the UV/Haze camera filters. A simpler solution may be fused quartz microscope slides and cover slips. One can also get disks. For instance: ..https://www.tedpella.com/histo_html/quartz-micro-slides.htm |
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