### Author Topic: My motorized grain mill  (Read 607 times)

#### Cameron_l

• 1st Kit
• Posts: 2
• Beer me.
##### My motorized grain mill
« on: February 15, 2024, 02:15:18 pm »
It's too cold to brew outside, so I've been working in the shop. I completed my motorized grain mill. It's a Crankandstein 2SG geared mill powered by a 1725 RPM motor with a 10:1 reduction gear box salvaged from an old band saw plus a 4" pulley on the mill. If my math is correct, that gets me about a 90 RPM grind.

Action video! https://youtu.be/s3QMwEYRfvc?si=7uzdi5gaPTdk7JTs
« Last Edit: February 15, 2024, 02:17:21 pm by Cameron_l »

#### HopDen

• Senior Brewmaster
• Posts: 1154
##### Re: My motorized grain mill
« Reply #1 on: February 15, 2024, 03:26:47 pm »
Very nice!!

#### Semper Sitientem

• Assistant Brewer
• Posts: 151
##### Re: My motorized grain mill
« Reply #2 on: February 15, 2024, 04:41:31 pm »
Ingenious
Confidunt in cervisia nobis

Scientists believe that the universe is made of hydrogen, because they claim itâ€™s the most plentiful ingredient. I claim that the most plentiful ingredient is stupidity. - Frank Zappa

#### MDixon

• Brewmaster General
• Posts: 2346
##### Re: My motorized grain mill
« Reply #3 on: April 05, 2024, 11:55:44 am »
Looks like you're going from a 2" sheave on the gear box to a 4" sheave in the video (I can't see the photos).

Not sure of your V belt, but assuming it's a A, or 4L it's:

1725/10 = 172.5 x 1.85"/3.85" = ~83 rpm

If the belt is a 3L it's:

1725/10 = 172.5 x 1.55"/3.55" = ~75 rpm

The pitch diameters I used are from an old Grainger reference. The PD of a 3L is 0.3" less than an A or a 4L. My old article from 1999 had that mistake in it and I never corrected the error.
https://www.carboyclub.com/archived_pages/motorizing_a_malt_mill.htm

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#### John M

• Assistant Brewer
• Posts: 147
##### Re: My motorized grain mill
« Reply #4 on: April 05, 2024, 05:12:41 pm »
Love my CrankandStein!
Don't judge a beer by it's cover.

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