I have the 10gal cooler set up from NB. just got the Barley Crusher from them as well. it's preset at .39 I know there's more to efficiency than just the crush, but what gap have any of you been getting your best efficiency with?
There doesn't seem to be a "one size fits all" in setting the crusher because there are differences in equipment and how it is set up. Try a batch with yours as is. Check the efficiency you get. Not good enough for you? Set the mill tighter. When you get the grains milled so fine that you have trouble getting the wort to flow out of the tun, you went a little too far. Back it off a bit and see if it solves the problem.
I found the poll, 52% is at factory setting of .039 and 25% is at .036.
My barley crusher is at .037 and my efficiency is 82%
Keep in mind though that crush is just one element of efficiency.
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