South bend 84a seems slow

Mama_tried · Feb 18, 2019

I purchased a 1929 84a last week it’s running a 1 hp 1725 motor. I was really surprised by how slow the machine is? I’m guessing it at 250-300 rpms on the fastest pulley combo. It seems the 84a is rare so I can’t find videos of any of them running but the similar 9” version seems much faster in videos? Am I stuck with the slow speed or can i get more out of it?

Thanks
Dane

iwananew10K · Feb 18, 2019

according to pg 12 here, assuming a countershaft speed of 290rpm your top speed should be 595rpm.

http://vintagemachinery.org/pubs/1617/18536.pdf

Mama_tried · Feb 19, 2019

Thanks that’s some good literature.. I’m used to working with a little more speed, is there a safe RPMs that has been found to take the older machines to without damaging the internals?

iwananew10K · Feb 19, 2019

sure.
600rpm.

MetalCarnage · Feb 20, 2019

I'm not sure of your knowledge of these old lathes so this may be a foolish question but, do you maybe have the backgear engaged? It changes the gearing so that the lathe can run slower.

FWIW

-Ron

johnoder · Feb 20, 2019

One of their most jam packed with info efforts published about that time likely will answer a lot of questions

http://vintagemachinery.org/pubs/1617/5795.pdf

Mama_tried · Feb 20, 2019

Nail on the head

MetalCarnage said:
I'm not sure of your knowledge of these old lathes so this may be a foolish question but, do you maybe have the backgear engaged? It changes the gearing so that the lathe can run slower.

FWIW

-Ron

Thanks Ron.. I’ve have zero knowledge of these machines and that was exactly what was wrong.. it is very usable now! Huge difference!

Dane

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