The video shows our prototype runner sharpener made using mdf, plywood and sitka stringers. The mdf "ribs" were cut out using a CNC router and the stringers machined to fit snuggly so once assembled the frame is very true.
We added a 1/4 inch steel backer plate and a plywood deck. We had an old 1HP 1725 rpm reversible motor and our friends at Hamilton Metal Stamping helped us mount a rubber drum on the motor shaft. A plywood front holds an on/off switch and a reverse switch (covered to prevent accidental operation when the motor is energized).
The belt idler down at the other end is made from a couple of large bearing wheels. The idler supports "float" on springs and are trapped by steel plates. Additional L shaped brackets are added with 1/4 24 bolts threaded through to adjust the "tilt" and centre the belt. in order to put a belt on, the adjusters are backed off and the idler pushed inwards by hand, compressing the springs and allowing the belt to slip on.
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