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Old 02-26-2013, 07:59 AM   #1
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Default Rate My Crush (MM2-2.0, factory gap)

Rate my crush, please?

Conditioned with 6 oz of water in a 31# grain bill. Soak time was 10 minutes. Milled on a Monster Mills MM2-2.0 with the factory gap, two passes, at approximately 200 RPM. You're looking at 78.4% 2-row, 11.4% MO, 6.8% C15, 3.4% C40. 72.3% efficiency at 1.059 pre-boil in the BK. Final runnings were 1.039.

First pass; mostly crushed, but not separated from husks really.



Second pass; looks good to me -- was windy, so a tiny bit of flour blew off.



Should I bother tightening it with these numbers?

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Old 02-27-2013, 01:54 AM   #2
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I get the 2nd pic with not so much tearing with a single pass with a gap of.038 (JSP Malt mill) running 120 rpm. Last batch an Old English Strong, 37# of Pale Ale malt 2# choc conditioned with 12 oz. stirrer for 2min rest for 5min repeated twice more ended with an 83% (per Beersmith) I found that lower rpm gets a better crush without tearing.

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Old 02-27-2013, 02:45 AM   #3
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I estimated 200 RPM. It's probably less, but I have no real way to know without clocking it. I use this low-speed, high-torque drill, about 5 clicks out from the slowest setting it offers. Manual says 0-550 RPM. I can't imagine I have it anywhere near half speed.

http://www.harborfreight.com/1-2-hal...ill-93632.html

I'll try slower next batch. Question stands. Do I need to crank down the gap?

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Old 02-27-2013, 11:43 AM   #4
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I would check the gap I have seen that some are set as much as .050 Personally from the pics I would close it up

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Old 02-27-2013, 05:20 PM   #5
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As someone who has never used a grain mill, I have to ask: Is it common/necessary to make multiple passes?

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Old 02-27-2013, 07:19 PM   #6
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On my new MM-2: one pass at .038, conditioned= perfection. Factory was .045; grain almost fell through.

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Old 02-27-2013, 09:02 PM   #7
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How is "perfection" defined? Do you calculate your efficiency, and if so, what are you hitting with that crush?

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Old 02-27-2013, 09:12 PM   #8
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Well, whipped out the feeler gauges. 0.061" right, 0.054" left. Had a few while putting the hopper together, so I'm almost sure I did that when bolting the two together. Not the factory's fault.

Crank it down to 0.040" both sides. Malt is conditioning now for a test.

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Old 02-27-2013, 09:44 PM   #9
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0.040", slower than before, a bit torquier. One pass. Conditioned lighter. This is 1.11# of Munich (7L).



Much flour-ier. Is it better though?

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Old 02-27-2013, 11:10 PM   #10
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Mash it and find out!

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