Precision Machinery of Shortsville New York. I don't see much info on this company, not even at Vintage Machinery! This grinder would date back to the turn of the last century, The small pulley would mean a high rotational speed but how fast? And would there be slippage?
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Papec Machine; they made agricultural chopping and grinding implements so it doesn't surprise me to see a flat-belt driven grinder...gotta sharpen those chopping blades somehow. The belt-drive would have been relatively slow so the grinder wouldn't be spinning all that quickly. The appendage is for mounting a guide bar, I would imagine or possibly a custom sharpening jig they provided for their equipment?
The grinder in your picture has a combination flat and v-belt drive which does not appear on the one shown on Vintage Machinery so that may have been added later or it's a more modern model:
http://www.vintagemachinery.org/photoindex/images/32174-B.jpg
I have a scythe grinder that's basically the same design but it has two arbors, with the belt drive in the center. One side has a football-shaped grinding wheel for the scythe blades and the other a flat grinding wheel.
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