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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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Thread Tools |
27th May 2017, 10:08 pm | #21 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,861
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Re: Any ideas how to mend glass tuner scale?
Yes, that's incredible, Mike.
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27th May 2017, 10:31 pm | #22 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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Re: Any ideas how to mend glass tuner scale?
I am finding this an interesting thread. Could one take 2 very thin pieces of glass and decal the back of the one piece to use as the front, then sandwich the 2 together, with the decal/lettering in between?
They sell carbide glass drilling blades here locally in a selection of a variety of sizes in one package at Harbor Freight Tools I saw them yesterday. I think I remember reading in a very old copy of QST (1930's?) Hints & Kinks you could drill glass with a metal rod and very fine grit using kerosene of camphor as a lubricant. The rod needed to be the same size as the hole you need, and very light pressure and a lot of lube was used. IIRC, the pix was of it being done with a drill press. A lengthy process I suspect, with a lot of finesse needed. |
28th May 2017, 9:01 am | #23 | |
Octode
Join Date: Nov 2011
Location: Manchester, UK.
Posts: 1,875
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Re: Any ideas how to mend glass tuner scale?
Quote:
(Having just googled the former, I see one can now buy it on the usual auction site. That shouldn't surprise me, I guess, but it does!) |
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28th May 2017, 11:57 pm | #24 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,345
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Re: Any ideas how to mend glass tuner scale?
Ordinary Tungsten Carbide masonry drills work well. I saw their use demonstrated at a do-it-yourself exhibition in the 1950's, where the demonstrator drilled a hole in a bottle by making a ring of putty around the hole's location, filled it with oil, and then used a hand drill, applying heavy pressure and slow speed with the bit immersed in the oil. I have since used the method myself on numerous occasions.
The type of masonry drill used has a tip with a negative rake on its leading edge, and works by crushing the material under the edge of the drill that is in contact with it. This is in contrast to a normal twist drill for metal or wood, where material is removed by the sharp leading edge biting into the surface of the work, getting beneath it, and levering it up. |