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Old 08-23-2012, 07:19 PM   #1
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Default Need Help With Motor Mill.. Picture Of Motor..

here is a picture of the motor i got from my brother brand new.. fully encased and everything.. i have a stainless steel table i wanna put it on with my MM3.0 and i need to know what pulley and gear to use... 1725rpm..


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Old 08-23-2012, 10:00 PM   #2
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Default Pulley Ratio

So, you want to reduce the speed to 175-200 or so RPM for milling.

Source (motor) - 1725
Desired (mill) - 200

1725 / 200 = 8.625

so, a ration of 8.625:1

If you use a 2" diameter v-belt sheave on your motor (pretty common), you will need one 8.625 times larger, or 17.25" diameter on your mill drive shaft.

Then, figure out how long of a belt you need to make this work, guessing 40-60 inches would do the trick. 60" belt would be 12" gap from center of your motor shaft to center of your mill shaft.

Hope this helps! Good luck!


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Old 08-23-2012, 10:02 PM   #3
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Default Pulley Image

Attached an image from http://www.blocklayer.com/pulley-belt.aspx to help you get the picture, forgive the fact that the size and distances are in mm.
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Old 08-24-2012, 12:26 AM   #4
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Well, thank you very much fernholz. I also have a 1725 rpm motor that I was thinking about using for motorizing a mill, and was just going to ask that very question!
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Old 08-24-2012, 12:40 AM   #5
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I just motorized my MM3 2.0 with a 1/2 HP, 1725 rpm motor.

If you use this 1.5" v-belt pulley:
http://www.grainger.com/Grainger/CON...t-Pulley-3X892

and this 44" v-belt:
http://www.grainger.com/Grainger/DAYTON-V-Belt-3L440

This 10" pulley will net you 190 RPM's:
http://www.grainger.com/Grainger/CON...t-Pulley-3X934

This 12" pulley will net you 157 RPM:
http://www.grainger.com/Grainger/CON...t-Pulley-3X938

Monster Mill suggests mill speed in the range of 150 - 200 RPM.


I have my mill gapped down to .0032" so it requires A LOT of torque. I started with the 10" pulley but the belt wanted to slip occasionally (wheat, roasted barley). I just installed the 12" pulley today and I am very happy with it.

Good luck!
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Old 08-24-2012, 03:54 AM   #6
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Thank you very much im gunna order those that you suggested right away...

Love homebrewtalk !!
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Old 08-24-2012, 03:57 AM   #7
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Default pulley

I would go with the the 1" on the motor and a 10" on the mill giving you 175 rpm. I had a similar problem but could only find a 2" pulley due to the motor shaft size so I ended up using a third pulley to get the rpms down.

As far as belt length I just bought the longest one they had at the hardware store and adapted my build to it.

The local True Value hardware store had everything I needed.
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Old 08-24-2012, 04:03 AM   #8
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Hmmm I do like the 175 rpm right in the middle maybe i will go that way... $32 for the 10" eh ??
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Old 08-24-2012, 04:25 AM   #9
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I wanna go with the 1" pulley and 10 " pulley.... But I can't find them on that website...
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Old 08-24-2012, 04:48 AM   #10
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Please let me emphasize how much torque is required to run this mill. It requires much more power than a standard mill. 2" diameter, 6" long triple rollers dwarf other popular models.

The MM3 2.0 is a DEMANDING mill. It's triple roller design is perfect for pushing limits on efficiency. The tighter the gap, the crankier she gets though. Go for the torque, you won't regret it.

Not to mention, the crush is sexy @ 157. I condition my grains and the husks are fluffy. A big plus for high flow, continuous recirc during the mash.


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