I'm about to write Monster Brewing with a question about the performance of my recently acquired 3-roll mill, but I thought I'd put the same questions to the experienced crew on this forum as well.
I am having an issue achieving a finer crush with my new MM3 2.0. As instructed on the provided sheet, I ran my first brew with the mill at factory setting (approximately .045"), and using a 1/2" corded DeWalt it mowed through the grain effortlessly. Mash drained quickly, without a hint of sluggishness but efficiency suffered (about 65%).
So for my next brew I thought I'd adjust the gap tighter for a more thorough crush. As suggested in the documentation, I put a tic mark to indicated the default gap before loosening the set screws. Facing the mill from the drive shaft side, I turned the adjuster a small amount (5 or 10 degrees maybe) to reduce the gap to a little over a .035". I turned the knob on the other side a corresponding amount in the same absolute direction, and then confirmed with a gauge that the gap was the same on both sides of the roller.
To my surprise, the crush came out as coarse as before I adjusted the mill. At this point I figured out why. The bulk of the grain was now channeling through the fixed gap side instead of through the adjusted gap side. No matter what gap I set below and up to .045", the majority of the time the grain was directed though the fixed rollers rather than the rollers with the adjustable gap. Due to this behavior, I was forced to double crush the all the grain.
My question is, how can I get a tighter-than-default crush on this mill? There must be something I'm missing here. I don't understand why the grain flow keeps switching between the two roller paths.
Anyone else have any experience with this?