How to assemble a grain roller mill for a microbrewery/brewpub

This mill setup is an excellent choice for brewpubs. It balances functionality and performance with price. The Crankandstein 328G roller mill will crush approx 15lb/minute and produce a nice crush that balances grain bed fluidity with mash efficiency. 

Items used in the build

  • Heavy duty wooden table (used)—$40
  • Two 7' pieces of 1.5" angle iron and eight bolts/nuts/washers—$30
  • Crankandstein 328G 8" fully geared three roller mill—$400
  • Crankandstein wooden mill plates and bolts (top and bottom)—$30
  • 1hp 120V fully enclosed, fan-cooled Electric Motor (1675rpm)—$160
  • Flex couplers for motor and speed reducer, and spider—$30
  • 10:1 Horizontal Shaft Worm Drive Speed Reducer and oil—$110
  • Bolts for motor, speed reducer and mill—$10
  • Electrical box, switch, cord grips, connectors and wood motor mount—$25
  • Flashing and universal vent boot—$17
  • Monster hopper and extension—$60

Option 1 (direct drive):

  • Flex couplers for speed reducer and mill drive shaft, and spider—$30
  • Board to raise mill shaft to same height as speed reducer shaft—$5
  • Positive: best milling action and won't slip
  • Negative: there is less protection against damage if the mill jams (e.g. from a tool falling in while operational)

Option 2 (belt drive):

  • Split bushing and sheave for speed reducer —$16
  • V Belt—$5
  • Pulley for mill drive—$10
  • Six brackets and ten bolts for tensioner—$40
  • Benefit: safer as the belt 
  • Positive: safer
  • Negative: since grain is hard, it can jam the rollers somewhat easily causing the belt to slip 
Tools used in build:
  • Drill and drill bits
  • Wrenches
  • Jig saw
  • Tape measure, square and pencil

Controlling vorlauf and lauter rates for best efficiency and preventing a stuck mash

Good crush size for high bed fluidity and mash efficiency