Great VERY RELEVANT multi-project topic going on here!
ChrisKy credits Doug Brethower with building the first hay baler wood chunker adapt.
DougB himself credits this to his cohorts: Ed, Franklin & Paul at Freedombiomass on his blog spot here:
My favorite “in-the-raw” before guards and paint of thiers is low down on his blogspot and linked here:
Video in operation after guards and paint here:
Theirs is set up as three-point rear tractor mounted, powered, and mobile.
TomC’s as a tow behind, PTO shaft driven.
Dustin’s as belt driven capable, towable.
All these fellows are modest and sharing freely out. I think concurrent developments.
Something to be learned from each approach. Read their worded presentations carefully for DO’s and DON’Ts.
On side belt driving that flat flywheel I can give direct experiences from a hundred or so guys doing this on thier big 24 inch external flywheeled Lister CS diesel engine.
Old wide flat belts would work OK. Belting material and especially motor/engine driving pulleys the bugger to source. Tap the old engine crowd for this route. These must be l-o-n-g laid out to work!
V belts as Dustin is using is my favorite. Good shock absorbing. Needs no separate tensioner except the motor/engine base. Inexpensive to buy. To improve belt life when flat flywheel driving on the no-no V belt inner flat a few tricks. Try going with a production numbered set of three. That will be a short alpha-numeric number printed or pressure embossed on the belt. There ARE industrial “banded” common back V-belts sets availble for a price.
Some guys have had their flat fywheels machined for V belt grooves. Look for a steam train group with a wheel lathe to do this. Contribute to thier “efforts”.
Diesel pickup flat serpentine drive belts work too. These are eight ribbed. Use a front of engine take off drive pulley. Then adapting to your motor/engine shaft becomes “the challenge”. Custom pulley’s like mine are machined for a Browning taper-lock adapter.
These belts HAVE NO SHOCK take up stretch at all! So you must use also the spring arm “tensioner” off a similar pick-up application. Watch the factory proven as full as possible belt wrapping routing and copy this this styling. These serpintine belts are designed to be flexed backwards readily also. But these serpentine belts unlike the V belts or old syle flat belts have no side mis-alignment sence of humor at all! So your cheap easy belt solution can become a very difficult fab job indeed. Otherwise they will just flywheel walk off.
Some groove thier flywheels for these. I do not think this is necessary with the huge flywheel surface area.
Cogged belt drive like timing belts JUST DO NOT DO IT!