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Thread: Edison Phonograph Thread
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10th Oct 2020, 04:27 PM #1Golden Member
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Edison Phonograph Thread
A good friend collects old sound producing play boxes and has several Edison style phonographs.
Where possible, the boxes are brought back into operational status, and it is fascinating when he demonstrates a horizontal wax cylinder.
The task he has asked me to do is screw a small holder of some sort into a larger 'thinga-ma-jingy'.
Perhaps it is the holder for the pick into the end of the trumpet.
The photo shows the two items.
Phonograph compr.JPG
The thread is a puzzle.
It is about 0.060" diameter.
It has been compared to a UNC 0/80 tap, specified as 0.060", but it is finer.
Tried a ISO 1.4/0.3 tap, about 86 tpi, but it is finer than that also.
Cannot see into the hole well enough to see if its threaded.
Edison was a cunning businessman, perhaps he used a proprietary thread.
Any suggestions ?
Keep well,
John.
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10th Oct 2020, 06:17 PM #2Philomath in training
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Have you tried BA threads? They were used on instruments all over. After that as you suggest, you are looking at 'specials'
Michael
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10th Oct 2020, 07:03 PM #3Golden Member
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If it is not a special thread used by the manufacturer I would hazard a guess that it might be a Thury thread. This was a Swiss thread widely
used in the late 19th century/early 20th century mainly by clock makers and instrument makers. The phonograph application would be similar to these.The BA series of threads are derived from these Thury threads and should be interchangeable.
British Association Screw Threads | BA Thread Chart | Apollo International
It looks as though an 11BA thread might fit your description. BA dies are still available, but 11BA is fairly uncommon. Two old stock ones left here though @ $19 each.
https://www.minibearings.com.au/stor...dbt015b/?v=943
Frank.
Michael posted while I was typing this.
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10th Oct 2020, 07:29 PM #4Golden Member
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Michael,
Thanks for the comments.
BA thread is unlikely considering it is Edison in the US, possibly predating the introduction of BA threads (1903 in the UK).
11 BA is 0.059 " dia and 81.9 tpi, so not a match.
12 BA is 90.9 tpi, but only 0.051", so also not a match.
I will try and sort out just where the small holder was acquired, then hope I can get a specification/description/guide as to what it is.
I live in hope that if I can penetrate the phonograph collectors cadre, I can define the thread,
The hole will let a 1 mm drill through, but not a 1.1 mm, so tapping to the screw thread is an option (if I can get a tap for that size).
Keep well,
John
franco posted while I was typing.
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11th Oct 2020, 01:31 AM #5China
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If you are talking 1mm, you may find this would suit, https://www.mektronics.com.au/bernst...1-pieces.htmlI have no Idea where you would buy separate taps, I use these and sometimes one like this for jewellery Makinghttps://www.jewellerssupplies.com.au/product/26907-thread-cutting-screwplate-set-0-8-2-0mm
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11th Oct 2020, 04:04 PM #6Most Valued Member
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11th Oct 2020, 10:20 PM #7Senior Member
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11th Oct 2020, 10:44 PM #8Gear expert in training
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12th Oct 2020, 09:43 AM #9Senior Member
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12th Oct 2020, 02:46 PM #10Golden Member
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OldRustyToolie,
Thanks, I might take you up on the optical comparator, a good excuse to get some of the locals to a lunch.
Got onto my friend, who told me we are dealing with a "Reproducer" and gluing is not an option.
The screw must be removed to fit a gasket (of some kind).
The screw is one of a number acquired from the US several years ago, source now lost.
He is a member of a forum and will make inquiries.
Checked the screw against a 12 BA screw.
About 6 pitches of the unknown = 5 pitches of the 12 BA.
So, pitch is about (90.9) X 6/5 = 109 tpi.
Keep well,
John.
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12th Oct 2020, 10:34 PM #11Senior Member
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13th Oct 2020, 06:58 PM #12Golden Member
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I think I have identified the thread.
Horological Waltham #1 is 0.059 " and 110 tpi.
Now to find a tap.
Keep well,
John.
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13th Oct 2020, 08:01 PM #13Gear expert in training
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AHAHAHAHA
Seriously though, good luck; I reckon you'll either have to make one or have one made, if you're lucky a watchmaker might have one. Do you know the angle?
As a side note, it would seem that Waltham threads are specified in metric diameter and imperial pitch for some reason https://pocketwatchdatabase.com/guid...olof-ohlson/92
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