Pulleys

[George Sanders]

I recently acquired a 12" Parks thickness planer. It is in good working order but it came with the wrong size pulleys. The cutterhead should run at 4000 to 4200 rpm. I want dual pulleys for maximum power transference. I will need a 7" to 8" for the motor and a 3" to 3 1/2" for the cutterhead. Where on earth can I find these?

[joe greiner]

I guess it doesn't matter why it came with the wrong size pulleys, unless just a matter of your preference. Grizzly has double groove pulleys in that size range, items G6262 through G6280. Bore size choices are limited on the larger pulleys.

Joe

[George Sanders]

Just came from the Grizzley site and found what I need. The planer came with an old Craftsman 1 1/2 HP 3450 rpm motor. That motor is going on a vintage Craftsman 10" table saw I picked up cheap at an auction. I have a 2 HP Leeson 1750 rpm motor that I want to use on the planer. A 7" drive and a 3" on the machine will put it in operating range of just over 4000 rpm. Thank you for the fast reply.

[Richard Butler]

Pulleys are also called sheaves.

www.surpluscenter.com - best prices on cast iron pulleys
www.grainger.com - carries Browning sheaves (pulleys)

[Dale Lesak]

With that pulley arrangement you will be losing 1/2 of the motors torque. So it'll be like having a 1HP motor.

[Carl Eyman]

With a larger diameter drive pulley you get more contact area for the drive belts. To this extent with less chance of slippage you are better off. I'd have to believe the comment of getting only 1 h.p. from a 2 h.p. motor is off base. If the torque is less the r.p.m.s are more producing t6e same ft. lbs. per minute. i.e. the same power.

[Harry Niemann]

RE the speed vs hp. You never get anything for nothing. If you double the speed you halve the torque.