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Old 12-04-2013, 07:51 PM   #1
processhead
 
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So I am crushing my grain with a corona mill, and I know what happens when the occasional pebble or stone get forced into the mill plates.

How do motorized roller style mills handle a hard foreign object like a pebble?
This would seem to be a damaging situation.
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Old 12-05-2013, 05:13 AM   #2
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Man, I wish you hadn't planted that thought in my head.

I've run close to a half ton of grain through my BC by now without encountering anything that could damage the mill, but I can imagine the right size piece of stone could knock the knurls off the rollers if it dug in.

Great. One more thing to worry about...

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Old 12-05-2013, 05:16 AM   #3
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In about 200 pounds run through my BC I have had only one rock go through. It made a loud pop sound and went right through the rollers. Couldn't really see any damage luckily..
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Old 12-05-2013, 05:25 AM   #4
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How do you get a rock in there in the first place?
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Old 12-05-2013, 05:27 AM   #5
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Well, it starts when the farmer plants the seed in the ground...

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Old 12-05-2013, 01:12 PM   #6
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Quote:
Originally Posted by CRoth36 View Post
How do you get a rock in there in the first place?
My observation has been that most of the malt companies seem to do a good job or keeping the crap out of their bags of malt.

Every once in a while one makes it through the sieve though.
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Old 12-05-2013, 03:43 PM   #7
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The LHBS that does our bulk buys claims to have broken a Barley Crusher snagging a stone in the grist.

My Corona mill locked up on a stone, the drill flew out of my hands and made several revs before coiling up enough cord to pull it from the socket, no damage to the mill, but a scary mishap. Best to keep a firm grip, I was caught off guard.

Be careful, it happens!

 
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Old 12-05-2013, 07:11 PM   #8
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I broke the 3/8" shaft off my crankandstein mill using a powerful drill when a stone got caught. I now set my cordless drill to driver mode at about half torque capacity so it will slip if that ever happens. If you motorize with a gear motor, it's probably a good idea to use a plastic spider coupler that would break before any metal parts.
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Old 12-05-2013, 07:20 PM   #9
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Good ideas here. I've had some small rock pieces go through my mm2 and so far the worst that's happened is some sand in my mash (mill looks unaffected). But I can imagine a larger rock getting in there and really causing a problem.

I almost always get some small rock pieces when my LHBS finishes up a bin of grain on my grainbill. Hmm... things to think about I guess.
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