Gallery, Projects and General > How do I??

Lathe spindle speed

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MadNick:
Morning,

I have a belt/pulley setup on my lathe.

At the moment, based on the diameter of the pulley in use I have slow, fast and medium - I'd like better accuracy.

How would I be able to work out the spindle speed on any of the pulleys please?

Nick

Pete.:
Take the motor speed and multiply it by the pulley ratio. If you have picador type pulleys they are usually in inches so let's say for instance it had a 2" pulley on the motor 8" on the countershaft that's a 1:4 primary reduction then it had a 2-3-4 and 4-3-2 step-pulley set between the countershaft and spindle would give you 1:2, 1:1 and 2:1 ratios there.

So, with a 4-pole 1450rpm motor, that would give you a 362rpm countershaft speed. Then you would have three spindle speeds from the step pulleys of 181, 362 and 724rpm

Or buy a cheap tachometer and measure it directly.

Fergus OMore:
A Barker lathe had 14 speeds!

MadNick:
Thanks Pete.

@Fergus O'Doodle Doo, a good answer but not the right one ;)
Nick

Fergus OMore:
There are not a lot of Barker lathes around  but that is what my records show.

Regards

N

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