vibrating lathe

If it is single phase, you might want to check the centrifugal switch that switches out the capacitor when it comes to speed. I had that problem with my Enco. It hummed and vibrated so that the tool was leaving patterns in my work. The motor got hot as hell also. John

The first thing I would check is the belts. The frequency of the vibration makes me suspect the belts before anything else.

Check the pulleys for embedded crap while at it.

When checking a machine for vibration, I always work backwards. Start by running the lathe with the belt off. No vibration, it's the belt. Still vibrates, it's the motor. Then pull the pulley off the motor and run it with just the naked shaft. Still vibrates it's the motor, no vibration, it's the pulley. Motor vibration can be from something coming loose inside the motor, or somehow the air gap got eccentric. Or maybe there's something wonky with the power going into the motor.

GWE

Check the belt for a delamination. Usual first thing to check

Gunner

"A prudent man foresees the difficulties ahead and prepares for them; the simpleton goes blindly on and suffers the consequences."

- Proverbs 22:3

Thanks guys, When I get around to crawling back behind I will find out. I am not sure how to back off the belt tension to test things out but I imagine I will soon be finding this out. There is a reason someone years ago paint marked NFG over the gear box :')) For a welding shop it is the ideal place for it to spend its last years. Randy

Check the belt for a delamination. Usual first thing to check

Gunner

"A prudent man foresees the difficulties ahead and prepares for them; the simpleton goes blindly on and suffers the consequences."

- Proverbs 22:3

In this area the cause is often a nest built by a mud wasp (dirt dauber) on a pulley or fan.

Don Young

Hey Randy,

You'll get others suggestions about the vibration, but as a point of interest (maybe??), the Bertram factory (in Dundas, Ontario) was torn down about 5 years ago. They produced some fairly large machinery there over the years. For a place that had foundry and all, there was no ground pollution found that needed any special effort to remove. , Just recently apartment condos started going up on the site.

Take care.

Brian Laws>We have a very old Bertram and Sons lathe. Recently we noticed a vibration