Author Topic: Grain Mill Gap Setting  (Read 8828 times)

Offline BairsBrewing

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Grain Mill Gap Setting
« on: January 22, 2015, 03:32:35 AM »
I have a cereal crusher mill and have never used it before, any suggestions on a good gap setting to start off with?

Offline Stevie

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Re: Grain Mill Gap Setting
« Reply #1 on: January 22, 2015, 04:29:18 AM »
Start with the stock gap and adjust from there. I set my MM2 to .35 recently and like my results.

Offline Frankenbrew

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Re: Grain Mill Gap Setting
« Reply #2 on: January 22, 2015, 12:52:25 PM »
I have a cereal crusher mill and have never used it before, any suggestions on a good gap setting to start off with?

I recently purchased a JSP Malt Mill with a pre-set gap of .040. First brew with it was a Kolsch (1.050 ish) and I got quick lautering and almost 80% efficiency. I was very pleased.
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Offline ynotbrusum

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Re: Grain Mill Gap Setting
« Reply #3 on: January 22, 2015, 01:03:13 PM »
I, too, have the JSP Malt Mill and tighten it up just a 5 degree turn on both sides.  I haven't gapped it with a measuring device, but I am guessing it's about .038 or so.  I tried tighter and my cordless couldn't turn the rollers well enough and my sparges got stuck, so I backed it off to that point eventually and now enjoy very good efficiencies and no stuck sparges.
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Offline TMX

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Re: Grain Mill Gap Setting
« Reply #4 on: January 22, 2015, 01:45:37 PM »
Well there are a few things to consider when setting your gap.

First, what type of brewing to you do? Typical all grain / BIAB ??
Second, if typical all grain, do you use a false bottom, manifold, or SS braid?

That being said, IIRC the default gap is approx 0.50, and I wold start from there, you might fall into the if it aint broke don't fix it category.

Before you crush anything, make sure you get a good gap measurement, and if you adjust, I would suggest dropping only 0.02 between batches.

Brew a batch, see what your efficiency numbers look like, also pay attention to your run off speed and how well your lautering goes.

If you BIAB or have a SS braid, you might be able to get away with starting in the 0.40 gap range.

In all cases, crush slow, it will keep the husk intact better.
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Offline bengelbrau

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Re: Grain Mill Gap Setting
« Reply #5 on: January 22, 2015, 02:55:41 PM »
I was once given some advice on how tight a spark plug should be when replacing it. My mentor said I should crank down on it until it breaks, than back off a tad. When I set my gap, I took it to below .030, and the hulls were too fine to allow a good lauter. I'm now at .032, and draining just fine.

Offline BairsBrewing

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Re: Grain Mill Gap Setting
« Reply #6 on: January 22, 2015, 03:14:11 PM »

Well there are a few things to consider when setting your gap.

First, what type of brewing to you do? Typical all grain / BIAB ??
Second, if typical all grain, do you use a false bottom, manifold, or SS braid?

That being said, IIRC the default gap is approx 0.50, and I wold start from there, you might fall into the if it aint broke don't fix it category.

Before you crush anything, make sure you get a good gap measurement, and if you adjust, I would suggest dropping only 0.02 between batches.

Brew a batch, see what your efficiency numbers look like, also pay attention to your run off speed and how well your lautering goes.

If you BIAB or have a SS braid, you might be able to get away with starting in the 0.40 gap range.

In all cases, crush slow, it will keep the husk intact better.

I only do all grain, have a false bottom, and RIMMS system.  I have feeler gauges, best thing I ever bought when I was 16, and set the gap on both sides to .040. Crushed some brown rice and was happy with the results.  Maybe I will stop at my LHBS and get a pound of 2-row to test before brew day.

Offline pete b

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Re: Grain Mill Gap Setting
« Reply #7 on: January 22, 2015, 03:44:46 PM »
I don't measure the gap, just played around with it until I got it right for me. I don't find that every malt mills exactly the same so I'm likely to adjust it per batch anyway. I just grind a little, look at it, and adjust if necessary. When I do biab I go quite a bit finer than with my batch sparge set up which is a cylindrical cooler with false bottom.
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Offline Slowbrew

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Re: Grain Mill Gap Setting
« Reply #8 on: January 22, 2015, 04:01:17 PM »
This thread just reminded me that I haven't set the gap on my barley crusher since I got it back after a rebuild.  That would probably explain my efficiency drop.  I had been getting .004 to .008 higher OG readings before the rebuild.

I usually run my mill around .038" and get good results (won't quote %s since I never bother with the math).

Now to go find my feeler gauges.   :D

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Offline TMX

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Re: Grain Mill Gap Setting
« Reply #9 on: January 22, 2015, 04:24:15 PM »
This thread just reminded me that I haven't set the gap on my barley crusher since I got it back after a rebuild.  That would probably explain my efficiency drop.  I had been getting .004 to .008 higher OG readings before the rebuild.

I usually run my mill around .038" and get good results (won't quote %s since I never bother with the math).

Now to go find my feeler gauges.   :D

Paul

I am in the same boat as well, going to start at 0.45 I think and see what gives from there
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Offline Pinski

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Re: Grain Mill Gap Setting
« Reply #10 on: January 22, 2015, 05:10:31 PM »
.039 works very well for me.
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Offline erockrph

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Re: Grain Mill Gap Setting
« Reply #11 on: January 22, 2015, 06:51:30 PM »
I use a 0.88mm guitar pick to set my gap (which = 0.035"). It works great for BIAB.
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Offline Wort-H.O.G.

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Re: Grain Mill Gap Setting
« Reply #12 on: January 22, 2015, 07:13:31 PM »
I use a 0.88mm guitar pick to set my gap (which = 0.035"). It works great for BIAB.

that's awesome multipurpose ingenuity there Eric.
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Offline Stevie

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Re: Grain Mill Gap Setting
« Reply #13 on: January 22, 2015, 08:00:38 PM »
I used my Costco card for the first day. I think that was .040

Offline pete b

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Re: Grain Mill Gap Setting
« Reply #14 on: January 22, 2015, 08:28:56 PM »
I use a 0.88mm guitar pick to set my gap (which = 0.035"). It works great for BIAB.
I play air guitar with the air from the gap between the rollers of my mill.
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