Grain mill crush speed - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Grain mill crush speed

Reply
 
Thread Tools
Old 11-29-2011, 04:59 AM   #1
lgoolsby
Recipes 
 
Jan 2011
Columbus, GA
Posts: 67
Liked 1 Times on 1 Posts



So there may not be stupid questions, buy there sure are a lot of inquisitive idiots. This probably falls in that category...

I recently got my own barley crusher. However, I have been less than impressed with it until recently. The thing that made the difference is running my drill slower than full throttle (actually just barely spinning, maybe 150-200 rpm). Since slowing things down I have had much better effeciency.

I only have three batches using the slower milling speed and I am still fairly new to AG so other factors are likely at play. But, I am still a bit worried about the increase in effeciency (~60% to ~83%). I am wondering if I should adjust the gap on my crusher, keep running at the lower speed, or throw caution to the wind and assume my better effeciency is due to me getting more comfortable with AG?

 
Reply With Quote
Old 11-29-2011, 05:05 AM   #2
bigbeergeek
Recipes 
 
Sep 2008
Visalia, CA
Posts: 4,110
Liked 126 Times on 102 Posts


I tightened up my BC a bit from it's factory setting (I turned the dials by 45-90 degrees) and now I happily get 89% efficiency consistently -- and I spin my drill as fast as she can turn. Aside from a fine crush and a fly sparge, another efficiency booster is knowing how much sparge water you need or when to cut off the sparge water and drain the tun dry. If you can completely drain your tun just as you hit your pre-boil volume you'll leave fewer gravity points behind with the grain.
__________________
"Good people drink good beer." -HST

 
Reply With Quote
Old 11-29-2011, 03:14 PM   #3
heckels
Recipes 
 
Jan 2011
Sioux Falls, SD
Posts: 816
Liked 65 Times on 51 Posts


I've wondered about this on several occasions. Initially I thought speed should not matter but then I started thinking that at slower speeds the grain is in contact with rollers for longer period of time which should yield a better crush. I think of it like a car compactor, the longer the exposure the more "crush".

 
Reply With Quote
Old 11-29-2011, 03:42 PM   #4
BenS
Recipes 
 
Mar 2009
Posts: 973
Liked 32 Times on 28 Posts


I run my BC at factory settings at full speed using my corded drill and get 80-85% efficiency. I think sparging techniques are much more important.

 
Reply With Quote
Old 11-29-2011, 03:44 PM   #5
TheMan
HBT_SUPPORTER.png
 
TheMan's Avatar
Recipes 
 
May 2009
Illinois
Posts: 3,045
Liked 340 Times on 252 Posts


I always read that a slower speed would give better results. So I originally ran my mill slow as possible. It really heats up my drill and I don't like that, so I decided to test it out and tried going almost full speed the last five batches. There has been no loss in efficiency or any change that I can tell.

My $0.02 is that your brewing technique could just be improving as you go along.

 
Reply With Quote
Old 11-29-2011, 03:51 PM   #6
passedpawn
Waste Allocation Load Lifter - Earth Class
HBT_ADMIN.png
 
passedpawn's Avatar
Recipes 
 
Apr 2009
☼ Clearwater, FL ☼
Posts: 26,540
Liked 7017 Times on 4154 Posts


I have run my drill at full speed (with a JSP MaltMill) and I get exactly the same crush, and efficiency.
__________________
- Andrew

 
Reply With Quote
Reply
Thread Tools



Forum Jump