http://www.survivalunlimited.com/grainmill/countrymillmotorized.htm
Creating your Own Motorization Kit
Many mechanically-inclined owners of the Country Living Grain Mill have decided to motorize their own mills. If you are interested in motorizing your Country Living Mill we have listed some guidelines below.
The preferred methods for motorizing your Country Living Grain Mill involve the use of intermediate pulleys, which are the key to reducing the milling speed. Thus giving you cooler more nutritious flour. This also minimizes the wear on your Country Living grinding plates and bearings.
Vertical Installation

A. Always remove handle when motorizing your mill.
B. Country Living Grain Mill
C. Note: Belts and pulleys should be enclosed for safety reasons.
D. Size A or 4L V-belt 1/2" wide X 5/16" thick.
E. 5/8" keyed shaft.
F. 6" pulley
G. 3" pulley
H. Pivot
I. 2 ea. 5/8" pillow block bearings
J. 2" pulley
K. Pivot
L. 1750 RPM washer or drier motor
M. Weight of motor will keep belts tight.
Horizontal Installation

A. Country Living Mill
B. 3" Pulley
C. Size A or 4L V-belt 1/2" wide X 5/16" thick
D. 5/8" pillow block bearings
E. 6" Pulley
F. 5/8" Keyed Shaft
G. 2" Pulley
H. 1750 RPM washer or dryer motor
The following formula will allow you to compute the pulley size needed to achieve a specific RPM: Driven Pulley size X Speed of Driven Pulley Divided by Speed of Driving Pulley = Size of Driving Pulley
120 is the absolute maximum RPM for the Country Living Grain Mill. Through long experience, we have discovered that our mill performs optimally at revolutions of less than 100 per minute.
The Easiest Method:
The 1150 RPM Motor with no intermediate gear reduction.

If you are not mechanically inclined, and want to go a simpler route, some people use the 1150 RPM motor because they are readily available. We at Country Living feel that this is still too fast because it heats up and creates wear on your plates. However, many people have done this because it is the simplest and quickest way to motorize your mill.
We personally recommend that you grind the flour slower and cooler, and have shown you, with the schematics and formula above, how to do this.
Motorizing with a 1150 RPM motor
A. Always remove handle when motorizing your mill.
B. The Country Living Mill
C. Size A or 4L V-belt 1/2" wide X 5/16" thick. Belts and pulleys should be
enclosed for safety reasons.
D. The Motor. Must be a 1150 RPM slow turning motor, at least 1/3 HP. If you get slots in the motor mounts, this will make it a lot easier to get the correct tension on the belt during installation.
E. Motor Pulley: 1-1/2" diameter.
F. Slidable mounting block for setting the belt tension. You can skip this if you got a motor with slots in the mounts.
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Ok, now I'm gonna have to upgrade my grinder....you guys make me hungry