[Cameron_l]

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

[HopDen]

Very nice!!

[Semper Sitientem]

Ingenious

[MDixon]

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

[John M]

Love my CrankandStein!