Here are some ideas for a wood chunker made from a rear end, like one out of a standard 1/2 ton pickup truck. I would like to make two different chunkers using one rear end.
The plan is to use one side of the axle to make a drum style circular blade and anvil chunker like Mr.Keith’s… just scaled down a bit because I have to go pick the rear end from the junkyard and I want something that I can move around, so I will be planning to have it on wheels. I do not have a tractor with a PTO, but do have an old tractor motor, so I hope to power it with a 15HP Briggs and Stratton engine.
I plan to use a flywheel (something like a brake drum?) on the pinion of the rear end that will be driven by the motor using a small pneumatic tire off the motor pulley (friction drive). The motor would be on a pivot to “engage/dis-engage” the drive wheels to start or stop the chunker.
The other side of the rear end housing would be used to make a screw chunker that eats 6-8" poles as seen in the video that Woody found: http://www.youtube.com/watch?v=wDkBGSeWgsE
That is a serious industrial duty processor, but think the basic movement could be replicated using a rear end that is modified with a larger axle tube, like 6" diameter and the axle shaft could be used as a center for a ribbon flight auger similar to what David S has spec’d out on Dave O’s chunker thread at http://www.driveonwood.com/comment/1235#comment-1235
I am still “on the drawing board” with this but I am planning to get the rear end soon so I can start with the Keith style drum chunker.
Seems like I will need to get a posi style rear if I want both axles to do work, right ?
I am not sure of the RPM for the motor to get the power it will need, but if it is turning at 1000 RPM and I get a 4.11:1 rear end, the axles would be turning at 4 times a second, which is still too fast. I can bring that down some more with a really tiny motor drive wheel and a larger diameter flywheel on the friction drive combo…or use a small/large pulley set.
Also have to figure out the details of the screw chunker, like the feed trough angle so it pulls the stock in automatically, and how to automatically clean the chunks out from between the auger blades once it makes the cut, and where to make the chunks exit (probably a hole in the right place and some gravity) any ideas/suggestions, etc ?
Really simplified drawing below: