Odd Spindle Thread Size Identity ???

[Bi11Hudson]

During the '30s well into the '60s there were many small lathes built. Some wood working machines, some that were convertable to marginal metal working machines. They weren't all that accurate and wouldn't cut threads without so much work and parts that purchasing a small machine like the Atlas built Craftsman (1" spindle) was the better approach.

I rebuilt a Sears 109 series machine for a friend, 6 X 12, that had a 1/2-20 spindle thread. Wife's Shop Smith has a 5/8 spindle but is not threaded, fixtures mount with a setscrew. Smaller spindles were common during that time, Where through spindle work was not an issue. There was an AMT (American Machine Tool) in the '60s that was about that size. I never saw one but the spindle was about the size of a nickle(5 cents) coin from the adverts I did see. And an unamed wood machine about that size that I am rebuilding as this is posted. It had a smaller, coarse threaded spindle, I didn't pay any attention what size. I am making a 3/4-20 spindle for 1/2 bearings and boring for a MT-1 for Wife to make pens on.

I would say just bore it to a usable size.

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[clm1899]

I

During the '30s well into the '60s there were many small lathes built. Some wood working machines, some that were convertable to marginal metal working machines. They weren't all that accurate and wouldn't cut threads without so much work and parts that purchasing a small machine like the Atlas built Craftsman (1" spindle) was the better approach.

I rebuilt a Sears 109 series machine for a friend, 6 X 12, that had a 1/2-20 spindle thread. Wife's Shop Smith has a 5/8 spindle but is not threaded, fixtures mount with a setscrew. Smaller spindles were common during that time, Where through spindle work was not an issue. There was an AMT (American Machine Tool) in the '60s that was about that size. I never saw one but the spindle was about the size of a nickle(5 cents) coin from the adverts I did see. And an unamed wood machine about that size that I am rebuilding as this is posted. It had a smaller, coarse threaded spindle, I didn't pay any attention what size. I am making a 3/4-20 spindle for 1/2 bearings and boring for a MT-1 for Wife to make pens on.

I would say just bore it to a usable size.

.

Thanks, but I'm not in need of this back plate, and it might be what someone is searching for. I would rather see it go to someone that can use it, as most people with a lathe this size would not have the ability to bore and internally thread a backing plate. It will find a new home with time.