View Full Version : 3"motor pully to a 4"

02-16-2005, 07:15 AM
Being a newibe, that being said, I have a 10"Sheldon 1936 model. Can I change the motor pully from a 3" to a 4" so as to get more rpm's. I figured I could always step it down if needed. any input would be most helpful. Thanks

02-16-2005, 08:24 AM
There is no reason not to change the pulley up or down to change the speeds.

What kind of drive does your Sheldon have? Most had a countershaft drive that the motor drove, that then drove the spindle. If it is this type, you might consider changing both pulleys to 2 step pulleys, making it simple to switch between high and low speeds.

02-16-2005, 08:32 AM
As long as the headstock bearings can take the higher speed, I don't see why not. If they're journal (bronze) bearings they may have an upper limit of about 1600 rpm. If they're ball bearings there shouldn't be a problem unless you really whiz it.

02-17-2005, 06:13 PM
Thanks for the info. I went to a 4" and man did it make a difference.