What should my Grainfather Electric Grain Mill speed be set to? This will depend on your grain type and volume as well as gap size setting. We recommend a motor speed of 4 for most pale malts; crush results may vary with different grains at different speeds. Related articles What should my Grainfather Electric Grain Mill gap size be set to? What do the settings mean? Instructions - Electric Grain Mill What is the correct sized grain crush and is this important? What happens if I crush my grain too fine? What do I do? Can I use a Mashing/Grain Bag with my Grainfather?