Robert Dee's Mill Motorization
One Country Living Mill owner, Robert Dee,
put together a motorized mill and kindly shared his photos and technical
specifications with us.
He purchased the motor from a
surplus center. The 2 Horse Power motor was originally used for a
tread mill, and has a soft start- which means it takes about five-seconds
time for the motor to build up to full speed.
This motor is rated at 1,800 rpm
(Revolutions per Minute), which would turn the Country Living Mill
far faster than we recommend- in fact, it just might send your grain mill
Robert solved this problem by
gearing the speed down with an intermediate 6" pulley linked with a 1 3/4"
pulley that ties to the 12" flywheel of the grain mill.
Not satisfied with off the shelf
parts, Robert re-machined one pulley he purchased so that it was very
concentric, within .002 inches, and then made his own pulleys for the
motor and idler shaft! The total
drive ratio is about 27-1/2 to 1.
Though the mill
has a variable speed adjustment, Robert runs the mill at about 60 rpm,
which he feels is the highest speed he can use without overheating the
There's a reason Robert has put
together one of the most impressive home-built motorization kits we've
ever seen. Apparently Robert is no amateur. For years he has
designed embedded microcontroller circuits and has several medical
instrument patents to his name. The Tach-Plus is an instrument he designed
to measure rpm, and this is what he used to determine the speed of the
mill. The Tach-Plus is available at the Design Specialties web