Edison diamond stylus bar pivot pin size/source
Posted: Sat Nov 06, 2021 2:09 pm
Hello all,
I know this been discussed before but not (or so I think) to the depth that I would like to discuss now.
I have recently rebuilt a Diamond Disc and two Amberola C reproducers. They all used the same size of pin through the stylus bar. The measured diameter of these pins was uniform: 0.0264+ of an inch. The "+" indicating that they were slightly larger than 0.264 but impossible to measure accurately with my dial calliper. If I had to guess, I would say they were between 0.2644 and 0.2645".
In trying to locate a source of wire/rod with that diameter, I have come up empty. I know that some suggest using #70 or #71 drill rod, but those sizes are 0.028 or 0.026", not as close as I would like. Similarly, #11 piano wire is 0.026", again slightly undersize.
Can anyone identify what Edison used? The difference between 0.026 and 0.026+" (my notation) may appear very tiny, but it is the difference between a press/push fit and a clearance (free running) fit. My understanding is that, unless the reproducer has been worked on in its past, the stylus bar should rotate freely about the pin which is stationary, having been pressed into the side bosses.
Any comments as to a source of stylus bar pin material?
Thanks very much,
Don Mayer
I know this been discussed before but not (or so I think) to the depth that I would like to discuss now.
I have recently rebuilt a Diamond Disc and two Amberola C reproducers. They all used the same size of pin through the stylus bar. The measured diameter of these pins was uniform: 0.0264+ of an inch. The "+" indicating that they were slightly larger than 0.264 but impossible to measure accurately with my dial calliper. If I had to guess, I would say they were between 0.2644 and 0.2645".
In trying to locate a source of wire/rod with that diameter, I have come up empty. I know that some suggest using #70 or #71 drill rod, but those sizes are 0.028 or 0.026", not as close as I would like. Similarly, #11 piano wire is 0.026", again slightly undersize.
Can anyone identify what Edison used? The difference between 0.026 and 0.026+" (my notation) may appear very tiny, but it is the difference between a press/push fit and a clearance (free running) fit. My understanding is that, unless the reproducer has been worked on in its past, the stylus bar should rotate freely about the pin which is stationary, having been pressed into the side bosses.
Any comments as to a source of stylus bar pin material?
Thanks very much,
Don Mayer
