Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On 03/13/2011 12:24 PM, Karl Townsend wrote:
I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. Lamps and stuff use 1/8" NPS rather than NPT. I was told that is a carry-over from the gas plumbing that it replaced. BobH |
#2
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Milady needs me for my shop skills. Don't happen that often.
She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl |
#3
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Karl Townsend wrote:
Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. |
#4
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 12:48:39 +0000, David Billington
wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. -- You create your opportunities by asking for them. -- Patty Hansen |
#5
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Larry Jaques wrote:
On Sun, 13 Mar 2011 12:48:39 +0000, David Billington wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. -- You create your opportunities by asking for them. -- Patty Hansen Cooling may not be required but it does help prevent the glass cracking due to thermally induced stress. |
#6
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
"Larry Jaques" wrote in message
No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Or a lot of other things either. |
#7
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
David Billington Inscribed thus:
Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Agreed ! Diamond Drills on Ebay have a good selection that are inexpensive. -- Best Regards: Baron. |
#8
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 15:55:57 +0000, David Billington
wrote: Larry Jaques wrote: On Sun, 13 Mar 2011 12:48:39 +0000, David Billington wrote: Karl Townsend wrote: The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. Cooling may not be required but it does help prevent the glass cracking due to thermally induced stress. I haven't noticed warmth above body temp in drillings I've done with the carbide "spade" style drills I use. I know the powdered diamond style gets hotter and can require coolant. -- You create your opportunities by asking for them. -- Patty Hansen |
#9
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 09:44:07 -0700, "Bob La Londe"
wrote: "Larry Jaques" wrote in message No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Or a lot of other things either. That's why I like to buy lots of little things when they show up there. -- You create your opportunities by asking for them. -- Patty Hansen |
#10
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Thanks for the advice. I placed an order with an eBay vendor.
|
#11
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Larry Jaques wrote:
Carbide bits are available ... http://tinyurl.com/48c32js ... Ooo ... they have "Integrated Speed Load system". What??? ... how can a drill bit have an "Integrated Speed Load system"? And what is it, for that matter. Oh, I know ... it's a triumph of marketing over engineering. Bob |
#12
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Karl Townsend wrote:
Thanks for the advice. I placed an order with an eBay vendor. What did you go for in the end?. BTW never used the spade bits myself but IIRC they've been around for decades or more, at least as long as I can recall but maybe the materials have improved. |
#13
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Many of the quick-change drill accessory "speed chucks" utilize the groove
around the hex portion of the shank to allow fast tool/cutter changes. These types of "speed chucks" typically have an outer sleeve that's pulled back to release a ball or other latching device which allows the user to change the tool/cutters quickly, instead of loosening the drill's chuck, and then retightening it for each change of tool/cutter. -- WB .......... "Bob Engelhardt" wrote in message ... Larry Jaques wrote: Carbide bits are available ... http://tinyurl.com/48c32js ... Ooo ... they have "Integrated Speed Load system". What??? ... how can a drill bit have an "Integrated Speed Load system"? And what is it, for that matter. Oh, I know ... it's a triumph of marketing over engineering. Bob |
#14
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Karl Townsend wrote:
Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. I still like the brass tube and abrasive powder method. If you take it slow, stresses are much lower than some pointy hard thing. Industrial diamond paste sounds like something that might hold promise. Wes |
#15
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
"Larry Jaques" wrote in message ... On Sun, 13 Mar 2011 12:48:39 +0000, David Billington wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. I haven't drilled that species of old glass but certain of the antique compositions like to fragment around the periphery of hole ends with carbide. Diamond hole drills would be my option. The tricks are to put them in a pond of water, feed straight, lightly and slowly and back the exit hole up with something for support against rim breakouts. If you have any waterproof ring (e.g. big gasket, O ring) you can use that as your coolant reservoir after using grease to affix it to the glass. I use a modified, quick-setting plaster as breakout protection on because it can conform to the glass. It shears off after drilling with a tiny bit of cleanup. Something that didn't involve cleanup would be an improvement. Regards, Edward Hennessey -- You create your opportunities by asking for them. -- Patty Hansen |
#16
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
"Karl Townsend" wrote in message ... Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl I've found that diamond grinding burrs in a Dremel do the job very well. Submerging the glass under water with the grinding site just beneath the surface catches the dust, keeps everything cool, and damps vibrations in the glass. Art |
#17
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 17:20:32 -0400, Bob Engelhardt
wrote: Larry Jaques wrote: Carbide bits are available ... http://tinyurl.com/48c32js ... Ooo ... they have "Integrated Speed Load system". What??? ... how can a drill bit have an "Integrated Speed Load system"? And what is it, for that matter. Oh, I know ... it's a triumph of marketing over engineering. That's marketspeak for "quick-change chuck style", Bob. I call 'em "hex-shanked do-dads", myself. -- You create your opportunities by asking for them. -- Patty Hansen |
#18
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 19:21:20 -0400, Wes
wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. I still like the brass tube and abrasive powder method. If you take it slow, stresses are much lower than some pointy hard thing. Industrial diamond paste sounds like something that might hold promise. It also costs an arm and a leg and takes a week per hole. Pass. The arrowhead carbides are dynamite, Wes. Try it. You'll like it. -- You create your opportunities by asking for them. -- Patty Hansen |
#19
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 12:48:39 +0000, David Billington
wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. I used a cordless screwdriver powering a copper or brass tube through a 1/4" square drive U joint and very little pressure. Gerry :-)} London, Canada |
#20
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On 03/13/2011 05:24 AM, Karl Townsend wrote:
Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl Whatever else you do, experiment on coke bottles or mayonnaise jars or whatever new glass things you have sitting around, before you go thumping on SWMBO's nice old antique stuff. Instead of putting light bulbs in there, wouldn't they look better with canned apple slices, or cherries, or something? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#21
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Larry Jaques wrote:
Bob Engelhard wrote: Larry Jaques wrote: Carbide bits are available ... http://tinyurl.com/48c32js ... Ooo ... they have "Integrated Speed Load system". What??? ... how can a drill bit have an "Integrated Speed Load system"? And what is it, for that matter. Oh, I know ... it's a triumph of marketing over engineering. That's marketspeak for "quick-change chuck style", Bob. I call 'em "hex-shanked do-dads", myself. Oh ... reading comprehension problem. I read "Integrated Speed Load system" as something integral to the bit that had to do with the load on the bit & bit speed! I should pay better attention. Bob |
#22
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
responding to
http://www.rittercnc.com/metalworkin...ss-494625-.htm bitsinbobs wrote: Larry Jaques wrote: On Sun, 13 Mar 2011 12:48:39 +0000, David Billington wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. -- You create your opportunities by asking for them. -- Patty Hansen --I agree with Larry , heat is not the problem , vibration is , drilled a car window once , great job , standing talking 5 mins later booooof shattered , use a hand brace IF IT'S NOT BROKE WORK AT IT UNTIL IT IS |
#23
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 17:51:41 -0700, Larry Jaques
wrote: On Sun, 13 Mar 2011 19:21:20 -0400, Wes wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. I still like the brass tube and abrasive powder method. If you take it slow, stresses are much lower than some pointy hard thing. Industrial diamond paste sounds like something that might hold promise. It also costs an arm and a leg and takes a week per hole. Pass. The arrowhead carbides are dynamite, Wes. Try it. You'll like it. Valve grinding compound and a brass tube with a couple notches works well and fairly fast. Gerry :-)} London, Canada |
#24
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Gerald Miller wrote:
On Sun, 13 Mar 2011 17:51:41 -0700, Larry Jaques wrote: On Sun, 13 Mar 2011 19:21:20 -0400, Wes wrote: Karl wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. I still like the brass tube and abrasive powder method. If you take it slow, stresses are much lower than some pointy hard thing. Industrial diamond paste sounds like something that might hold promise. It also costs an arm and a leg and takes a week per hole. Pass. The arrowhead carbides are dynamite, Wes. Try it. You'll like it. Valve grinding compound and a brass tube with a couple notches works well and fairly fast. Gerry :-)} London, Canada I remember making lamps out of bottles when I was a kid. I don't remember exactly how I made the holes but I seem to remember dropping a ball bearing through a tube onto the bottle and the results were like a bebe hole in a window. I do remember the way to cut the bottles in half. Get a piece of cotton string and tie it around the bottle where you want to cut. Soak the string in lighter fluid and light it up.. The bottle will break around where the string is. John |
#25
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Sun, 13 Mar 2011 19:29:37 -0700, Tim Wescott
wrote: On 03/13/2011 05:24 AM, Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl Whatever else you do, experiment on coke bottles or mayonnaise jars or whatever new glass things you have sitting around, before you go thumping on SWMBO's nice old antique stuff. Good advice. Instead of putting light bulbs in there, wouldn't they look better with canned apple slices, or cherries, or something? You're not married??? Karl |
#26
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
The 5-piece set I just bought at Ollie's (new discontinued product
surplus/salvage store) was $4.99 +tax, a Black & Decker set, although without the hex shanks/quick change capability. -- WB .......... "Larry Jaques" wrote in message ... Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all. http://tinyurl.com/48c32js HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. -- You create your opportunities by asking for them. -- Patty Hansen |
#27
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Karl Townsend wrote:
You don't understand the stakes here. I'm the one that will get the heat treatment. Antique glass top canning jars are quite rare. "... quite rare." In that case, don't drill at all. Make 2 capacitors on the bottom of the jars by gluing aluminum foil on the inside & outside. Connect the light(s) (LED's) between the capacitors on the inside and drive the outside with a high frequency. I'll let you work out the numbers. Bob Or, do like the chargers for electric toothbrushes & make core less transformers with coils on the inside & outside of the jar. I like the capacitors better. |
#28
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
On Mar 13, 9:09*pm,
(bitsinbobs) wrote: responding tohttp://www.rittercnc.com/metalworking/drill-old-gass-494625-..htm bitsinbobs wrote: Larry Jaques wrote: On Sun, 13 Mar 2011 12:48:39 +0000, David Billington wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. I haven't measured up for sure, but I'm thinking this stuff is 1/8 NPT size. OK, how do I drill very old glass? I get several points off for every one I break. Karl The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. The new way would be to use a diamond hole saw but still have the dam to retain water to keep the glass cool. You can probably buy them on eBay for a few dollars in the size you want. Carbide bits are available for under ten bucks and they work extremely well for tile, glass (not tempered), and ceramics. No cooling necessary at all.http://tinyurl.com/48c32js*HF apparently doesn't carry them any more. Back up the drilling point so the glass doesn't break out the back side. Cold clay works well to provide a solid backing. Use a light touch and immediately stop the drill upon exiting. Quick-stopping cordless drill motors work best for this. -- You create your opportunities by asking for them. * * * * * * * * * * * * * * * * *-- Patty Hansen --I agree with Larry , heat is not the problem , vibration is , drilled a car window once , great job , standing talking 5 mins later *booooof shattered , use a hand brace * IF IT'S NOT BROKE WORK AT IT UNTIL IT IS- Hide quoted text - - Show quoted text - Not vibration in that case, US car side and rear windows are tempered glass, I'm surprised the window lasted long enough for you to drill through it. Usually tempered glass will crumble after the tensioned surface is scratched. Stuff is very strong, but that's its weakness. Stan |
#29
Posted to rec.crafts.metalworking
|
|||
|
|||
drill old gass
Pete Snell wrote:
On 3/13/2011 8:48 AM, David Billington wrote: Karl Townsend wrote: Milady needs me for my shop skills. Don't happen that often. She has old canning jars. The type with a glass lid and a little wire arrangement to pull the glass lid tight. She wants to put small lights inside and needs a hole drilled. snip The old way would be to use some copper or brass tube with an OD the size of the hole you want. Make a dam round the hole with plasticene and add some abrasive like valve grinding paste and a bit of water or oil, Hold the tube in a drill press running at a slow speed and repeatadly apply pressure and lift. The abrasive imbeds in the softer tube material like a lap and grinds through the glass. I did the exact same job a few years back, and used the technique David describes. It works well, but you have to be patient. It was about 10 minutes of 'drilling' for each hole if I recall correctly. FWIW, I read this exact thing some decades ago. Haven't tried it, because I haven't had a need to drill holes in glass, but it's nice to know it works. :-) Cheers! Rich |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|