I just rigged my vertical mule powered mill up
using a 4:1 right angle gear box and a 3:1 pulley system using v belts going
to the mill itself. I'll drive the gearbox with a flat belt. I used
a 3 sheeve pulley on the mill and on the driving pulley. This all took place
for under $100 but I had to do a lot of scrounging and some fanagaling to
make it all happen. I wouldn't worry about shaft sizes, just find the pulleys
and gearboxes you need and then have a friend with a lathe make you some
adapters. In other words get the pieces, then make them fit. You should
be able to find a lot of this stuff at a scrap yard or surplus machinery
place. Compressor pulleys work nice. Good Luck!
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