Robert Dee's Mill Motorization GuideLines:
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 into orbit.
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 grain.
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 site.