Carl, Bill - it´s a 6 pole motor. Gives only 950 rpm at 50HZ, which is good.
It´s old and actually rated 2hp at 500V (industrial voltage - it´s probably from nearby papermill). Since my domestic is 400V I´ll get only 1,6hp out of it, which is not so good, but still sufficient. On the other hand gearing ratio decides biting force.
Pullies: 1:2,4 ratio (100mm:240mm). Big pully is from an old lawn mower tractor.
Chain drive: 1:4 ratio (11:44 teeth). Double bicycle chains. Gears from two slaughtered bicycles. They are worn out, but to this application I had the opportunity to turn them around (brand new on that side)
Maths says end result is close to 100 rpm = 6,6 snaps/s. Slower than most youtube rebaks, but fast enough.
Cutting shaft gears: I don´t have any machining equipment. These gears are commercial shop made. One of their customers rejected them and they were occupying shelf space. They are sturdy hardened steel. I couldn´t get hold of a smaller one to drive them. That´s why I went the chain drive route.
Reason for gearing inside frame is that the hardened gears came with bearings pressed in to them, which means that my 20mm bolt shafts are at a stand still. Cutting blades are 6mm ss plates bolted to 50mm square pipes. I pressed bearings into the pipes.
EDIT: Wayne should have one of these. Bites look like beavers did it. I understand they are one of his favorite animals.