In the Spring of 2010 we purchased a used GreenDrum from UNCG.
Amy Peddie and crew refurbished the drum, fabricated a new mixer and installed the system right next to our 512.
This new GreenDrum is a 408 model. BW Organics no longer makes this size.
How is the 408 system different from the 512?
- Besides being half the size of the 512, the 408 has a different drive mechanism for lowering the speed and increasing the torque. The 408 utilizes two jackshafts which change the speed/torque in a more reliable, lower maintinence, easier way.
- Instead of turning on a metal saddle with plastic runners, the 408 sits on four cast iron wheels on grease bearings.
- The 408 has an insert which the auger rests on. The insert uses a plastic shield on the inside of the drum to hold it close to the drum. Amy likes this more that the insert on the 512, which seems as though it was only supposed to rest next to the drum. Over time the 512 insert has bent out and now compost leaks out the front when the drum turns.
- After having issues with the auger on the 512, Amy Peddie, Assistant Supervisor to the crew, and the Recycling Crew decided to make the auger on the 408 almost level. To explain the issues with the 512 auger, see the Parts of the GreenDrum section. To make the auger level there were repercussions: the mixer needed to be higher, the mixer required more lateral supports, the auger required a stable stand (with easy access for maintenance), the mixer required a platform to stand on while loading, which required a railing for safety.
- The new mixer has a self-cleaning door which should clean out runners during operation.
As of October 2010, the system in is in its final stages of set-up (fabrication of covers for pinch points) and will be online once the electric crew gets around to wiring it up.