From mtcasino@comcast.net Thu Oct 25 08:43:55 2007
Subject:RE: sewing machine motors

As an example, the fast motor spins at 1725 RPM.

The pulley on the motor shaft has a fixed diameter as dose the pulley on the
horn or rotor.

Let’s use a diameter of 1.5” for the drive pulley and 4.5” for the horn or
rotor pulley.





(RPM of drive pulley X Diameter of drive pulley) / Diameter of
driven pulley = Final RPM



(1725 RPM* 1.5) / 4.5 = 575 final RPM



If you wanted to figure the pulley size for a final RPM the formula would be
like this:



(RPM of drive pulley X Diameter of drive pulley) / Final RPM =
Diameter of driven pulley.



(1725 RPM* 1.5) / 400 RPM = 6.46875”





Mike





most of the motors I'm seeing are 5000 RPM, which is WAY over the
usual fast speed of 400 RPM. what I can't figure out is if that 5000
RPM translates to something much slower once attached to a belt...any
engineers out there who can answer this?

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