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Old 02-01-2011, 04:29 PM   #1
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Default What RPM do you run your grain mill at?

I just was gifted a 5 HP 3450 RPM motor. I've got a 2" Drive Pulley connected to a 8" Driven pully on a mandrel, which I'll attach to the barley crusher via coupling. The resulting rpm is 862.5 or a .25 reduction

How fast is too fast? I was hoping to keep with the 8", but if I need to, I'll start looking for a 10 or 12"

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Old 02-01-2011, 04:32 PM   #2
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Personally, I wouldn't run it much faster than 250RPM.

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Old 02-01-2011, 04:41 PM   #3
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850 is a bit fast. Shoot for under 500 rpms.

I crush with a monster mill hooked up to an ancient 500 rpm drill. Crush was acceptable at full speed, its even better with the drill hooked up to a variac (reduces voltage) set to 35%.

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Old 02-01-2011, 05:38 PM   #4
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The barley crusher site say's at 500 rpm it yields 6lbs per minute. I wouldn't go any faster than that.


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Old 02-01-2011, 06:09 PM   #5
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I used a 1725 RPM dryer motor with my MaltMill. With a 10" sheave on the mill and a 1.5" sheave on the motor, I got the RPM's down to approx 190, and it runs great with a good crush. I would try to keep your RPMs below 300 to avoid pulverizing the grain.


Here is a good calculator to determine resulting RPMs:

http://www.csgnetwork.com/pulleybeltcalc.html

Good luck!
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Old 02-01-2011, 06:18 PM   #6
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I run my Barley Crusher @ 400 rpm. no problems yet.

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Old 02-01-2011, 06:30 PM   #7
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I affixed an old belt driven variable speed drill press to run my malt mill. I found running 500 - 600 rpm sufficient. I have run it up to 1700rpm and the quality of the crush was the same the only fear I have is prematurely ruining the bronze bushings.

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Old 02-02-2011, 12:43 AM   #8
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Thanks for all the input. It looks as though I'll have to switch up to the 12 inch pulley in order to get it where it needs to be.

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Old 02-02-2011, 02:48 AM   #9
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Check McMaster Carr for pullies, they seem to have everything.

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Old 02-02-2011, 05:11 AM   #10
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I found a 12" on amazon for 27 bucks... it's the largest I could find with a 5/8" shaft arbor. According to the calculator that should get me down to 578 RPM. That's a little more than I was hoping for, but I think it will do. The only down side I can think of at that RPM would be shredding husks... anything I'm missing?

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Mom was right. Never argue with an idiot. They just drag you down to their level and beat you with experience.

Where's my beer. I know I left it around here somewhere.....
Kegged/Drinking:Nihilistic Integrity - Black IPA, #1 BIAB pale ale, Bells Two Hearted - yes a keg of the real stuff
Kegged/Conditioning:Wally N Seans Braggot, Emerald Eyes - Irish Red, Atomic Tsunami - brown
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