View Full Version : RPM's
Matt Murphy
03-20-2009, 12:12 AM
Hello again.
I have another question concerning my lathe (http://sawmillcreek.org/showthread.php?t=106845). How do I figure RPMs for it? Is there a way to do it?
Thanks
Mike Lipke
03-20-2009, 12:20 AM
you can buy a mechanical tach, or an electronic one. Electronic versions are as low as $30 on Ebay. Put a piece of reflective tape on the handwheel, turn on the lathe, aim the tach at the spinning tape, and you get a digital readout.
Search ebay for non contact tach
Scott Conners
03-20-2009, 1:31 AM
If you know the rpm of the motor, you can calculate the spindle speed by measuring the diameter of the steps in the wheels and doing a bit of math. (Drive pulley diameter x motor rpm)/driven pulley = output rpm.
M Toupin
03-20-2009, 1:31 AM
or you could just do the math for free
http://www.owwm.com/math/arborrpm.aspx
Mike
Larry Marley
03-20-2009, 1:41 AM
or you could just do the math for free
http://www.owwm.com/math/arborrpm.aspx
Mike
Cool link....
Matt Murphy
03-20-2009, 2:56 AM
or you could just do the math for free
http://www.owwm.com/math/arborrpm.aspx
Mike
Thanks Mike! That makes the math a lot easier.
Jeff Nicol
03-20-2009, 9:03 AM
Matt, The rpms are not really a big deal. Most of the lathes in the world before LED redouts are still working fine and the turner turns where he or she is comfortable. I might turn something at about 1200 rpm and you might like it at 900rpm. I have 2 lathes without a readout and the PM3520b with it and I never look at the readout. Just my opinion.
Jeff
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