RPM question - Woodworking Talk - Woodworkers Forum
Old 08-28-2011, 08:39 AM Thread Starter
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RPM question

I have an old Rockwell/Delta lathe so it doesn't have an RPM indicator.
It has two step pulleys. One on the lathe, one on the motor.
How do I determine what speed I am turning at?
Thanks

tcleve4911 is offline

Old 08-28-2011, 09:15 AM
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Their should be a tag on the motor stating it's rpm.

Then, measure the pulleys diameter.

motor rpm x (chuck pulley diameter/motor pulley diameter) = chuck rpm

As an example: motor rpm is 1750
Motor pulley 2"
Chuck pulley 6"

6/2= .333
1750 x .333= 582 rpm at the chuck

Hope that helps.
Brink is offline
 The Following User Says Thank You to Brink For This Useful Post: tcleve4911 (08-28-2011)
Old 08-28-2011, 09:17 AM Thread Starter
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Thanks, Brink.
That helps a whole lot. I'll do my math this afternoon....

tcleve4911 is offline

Old 08-28-2011, 09:17 AM
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Quote:
Originally Posted by tcleve4911 View Post
I have an old Rockwell/Delta lathe so it doesn't have an RPM indicator.
It has two step pulleys. One on the lathe, one on the motor.
How do I determine what speed I am turning at?
Thanks
you need to know the rpm of motor and pully size on the driven or motor pully and the size on the driven one . go here and see if this helps http://www.woodweb.com/knowledge_bas...lculation.html
del schisler is offline
 The Following User Says Thank You to del schisler For This Useful Post: tcleve4911 (08-28-2011)

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