MWF FEED
10th October 2020, 05:20 PM
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 (https://metalworkforums.com/attachment.php?attachmentid=389121&d=1602307467)
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.
Attached Images
https://metalworkforums.com/images/attach/jpg.gif Phonograph compr.JPG (https://metalworkforums.com/attachment.php?attachmentid=389121&d=1602307467) (149.5 KB)
Read the full thread at metalworkforums.com... (https://metalworkforums.com/showthread.php?t=205769&goto=newpost)
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 (https://metalworkforums.com/attachment.php?attachmentid=389121&d=1602307467)
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.
Attached Images
https://metalworkforums.com/images/attach/jpg.gif Phonograph compr.JPG (https://metalworkforums.com/attachment.php?attachmentid=389121&d=1602307467) (149.5 KB)
Read the full thread at metalworkforums.com... (https://metalworkforums.com/showthread.php?t=205769&goto=newpost)