We've assembled our grain mill, so the next step is to go ahead and adjust the rollers to the required gap size. Adjusting the gap size is important as it effects how the grain is crushed. A smaller gap will lead to a finer crush, which can help with conversion of starches to sugar, but can cause issues with recirculation or sparging, since the water is not able to flow through the grain bed as easily. Conversely, a larger gap will give a coarser crush, which can aid in water flow through the grain bed, but can lead to decreased conversion of starches to sugar (ie. efficiency). Finding the sweet spot for your brewing system is key, and like most things, setting the gap size is pretty easy once you know how to do it. The provided instructions with the grain mill certainly lack the kind of detail you need to do it properly. Read on for some detailed steps on how we did it.
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