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Author Topic: Mill head motor retrofit  (Read 3679 times)

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Mill head motor retrofit
« on: March 08, 2011, 10:27:35 PM »
Howdy all,
  My Supermax mill has a busted up pulley in the head.  :( (not much unlike mine  ::) )
Anyway, it is very similar to a BP Variable type except there is no "step down" on the top of the upper housing.

I want to replace the original motor with an inverter duty motor that I have and use a VFD.
I can easily modify the mounting for this but am looking for advise on what pulley type and size to use.
Should I gear it UP ? or DOWN ? or 1:1 ?   :-\
Single or double V ... or timing type ? Size ?   :-\

 My little 1hp BP (8 speed) only has 1 seemingly small V belt.

It's just 2 HP and the motor is rated to 5200 RPM.
It will also produce 2 HP at very low rpm so I might not even need the backgear but it will be there if I do need it.
Thanks,
Russ
Re: Mill head motor retrofit
« Reply #1 on: March 09, 2011, 04:56:28 PM »
Ok, so I went ahead and ordered 2 double "A" (1/2") V-belt pulleys.
4.25" and 3.75" with taper lock bushings.
They will interchange so I have the option of  1.13:1 or .88:1
Planning to go with the reduction.
Russ

Offline Graham Waterworth

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Re: Mill head motor retrofit
« Reply #2 on: March 11, 2011, 05:14:53 AM »
I would go with the .88 ratio too, better to have that little bit more torque than the extra 600 revs. The V belts should run quieter at high revs, from experience tooth belts at above 4000 rpm get very noisy.

But that's only my opinion  ;D

Graham
Without engineers the world stops
Re: Mill head motor retrofit
« Reply #3 on: March 11, 2011, 07:24:08 AM »
I highly value your opinions Graham, even when they are in agreement with my own. ;D
Thanks,
Russ
 :)
Re: Mill head motor retrofit
« Reply #4 on: March 15, 2011, 06:15:08 PM »
I agree, you need the power over the speed.
Ed VanEss