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Selecting Motor For 2x72 Grinder

Discussion in 'Grinders' started by Hyde_me, Jul 15, 2015.

  1. Hyde_me

    Hyde_me New Member

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    Built the grinder, need the motor. I have a couple of motors but they both are single phase and use the centrifugal clutch so I cant change the speed even with a vfd. Now I am shopping for a new motor but not sure what I need. I am thinking 1 1/2 to 2 hp but what type of motor works with a vfd or even a "old style" fan dimmer switch? I really want the speed to be adjustable as I am also making Dancon's small wheel set and don't want to be frying the bearings quickly. I had considered a drill press style pulley system but the time I am done it would be similar cost to a new motor with vfd. Any thoughts?
     
  2. dancom

    dancom Dust Maker

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    Hyde,

    You will need a three phase motor to go with the VFD.
    I recommend knowing what VFD you will be using and the diameter of your drive wheel, before you buy the motor, but based on the horsepower indicated:

    For a Small Drive Wheel (2 to 4" diameter)
    • 208 or 220 Volt
    • Three phase
    • 1 to 3 horsepower
    • TEFC
    • 2 Pole (3450 RPM)
    For a Large Drive Wheel (5 to 6" diameter)
    • 208 or 220 Volt
    • Three phase
    • 1 to 3 horsepower
    • TEFC
    • 4 Pole (1740 RPM)
    This will keep your surface feet/min within a friendly range. You don't want to be running your motor/drive at half speed all the time as the motor needs to be cooled by its own fan.
    The last thing to decide is whether you need a C-face or not. This depends on how the motor will mount.

    I tried to answer a few common questions on this page: http://dcknives.blogspot.ca/p/the-dirt-on-drives.html

    Hope this helps!

    Dan
     

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