What RPM do you run your grain mill at? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > DIY Projects > What RPM do you run your grain mill at?

Reply
 
Thread Tools
Old 02-01-2011, 05:29 PM   #1
Seabee John
Swing the BIG hammer
HBT_LIFETIMESUPPORTER.png
 
Seabee John's Avatar
Recipes 
 
Oct 2007
Minnesota
Posts: 2,301
Liked 61 Times on 54 Posts



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"


__________________
North Saint Paul Brewshack
Quote:
Originally Posted by jmendez29 View Post
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
Primary:empty

 
Reply With Quote
Old 02-01-2011, 05:32 PM   #2
Misplaced_Canuck
HBT_LIFETIMESUPPORTER.png
 
Misplaced_Canuck's Avatar
Recipes 
 
Jan 2011
NE Columbia SC - Formerly, Montreal Canada
Posts: 2,882
Liked 164 Times on 133 Posts


Personally, I wouldn't run it much faster than 250RPM.

M_C


__________________
Quote:
Originally Posted by Misplaced_Canuck
Carbonic bite? Is that like the bubonic plague?
Quote:
Originally Posted by ebstauffer
Needless to say after more than a few drams my mental efficiency matched my mashing efficiency.

 
Reply With Quote
Old 02-01-2011, 05:41 PM   #3
TXCrash
HBT_SUPPORTER.png
 
TXCrash's Avatar
Recipes 
 
Sep 2005
DFW
Posts: 27,686
Liked 3259 Times on 3156 Posts


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%.
__________________
Quote:
Originally Posted by passedpawn View Post
You $&$&stik. You are my test. Part of it, anyway.

 
Reply With Quote
Old 02-01-2011, 06:38 PM   #4
wildwest450
Registered User
Recipes 
 
Dec 2007
Posts: 9,043
Liked 173 Times on 158 Posts


The barley crusher site say's at 500 rpm it yields 6lbs per minute. I wouldn't go any faster than that.


_

 
Reply With Quote
Old 02-01-2011, 07:09 PM   #5
michaeltrego
Recipes 
 
Sep 2009
Amherst, NH
Posts: 390
Liked 19 Times on 17 Posts


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!

 
Reply With Quote
Old 02-01-2011, 07:18 PM   #6
sco999
Recipes 
 
Sep 2010
North of Nowhere
Posts: 48

I run my Barley Crusher @ 400 rpm. no problems yet.

 
Reply With Quote
Old 02-01-2011, 07:30 PM   #7
SDMBREW
Recipes 
 
Jul 2010
Windsor
Posts: 109

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.

 
Reply With Quote
Old 02-02-2011, 01:43 AM   #8
Seabee John
Swing the BIG hammer
HBT_LIFETIMESUPPORTER.png
 
Seabee John's Avatar
Recipes 
 
Oct 2007
Minnesota
Posts: 2,301
Liked 61 Times on 54 Posts


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.
__________________
North Saint Paul Brewshack
Quote:
Originally Posted by jmendez29 View Post
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
Primary:empty

 
Reply With Quote
Old 02-02-2011, 03:48 AM   #9
rerobb
Recipes 
 
Oct 2010
Grove City Ohio
Posts: 48

Check McMaster Carr for pullies, they seem to have everything.
__________________
I'm not a beer snob, I just like good beer!

 
Reply With Quote
Old 02-02-2011, 06:11 AM   #10
Seabee John
Swing the BIG hammer
HBT_LIFETIMESUPPORTER.png
 
Seabee John's Avatar
Recipes 
 
Oct 2007
Minnesota
Posts: 2,301
Liked 61 Times on 54 Posts


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?


__________________
North Saint Paul Brewshack
Quote:
Originally Posted by jmendez29 View Post
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
Primary:empty

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY Grain Mill PDawg DIY Projects 16 06-06-2013 03:13 AM
Need pulley for my grain mill GRHunter DIY Projects 5 08-18-2010 07:09 PM
Motor for Grain Mill Sawdustguy DIY Projects 43 10-26-2009 01:41 PM
Something to DIY into a grain mill sjlammer DIY Projects 9 07-22-2009 12:38 PM
grain mill CAD? Gusizhuo DIY Projects 20 11-24-2007 06:40 AM


Forum Jump