An educated guess is the best I can do, and any gearheads present will hopefully correct me - working backwards from a rear end in a car, at 10-15mph you will pretty much be idling, less than 1,000 rpm on the engine. Assuming a transmission ratio of 1:1 in high gear, and a rear end ratio of 1:3 or 1:4, that would put 250-350 rpm into the differential. Working back, turning the wheels at that speed would cause the yoke to spin at the same 250-350 rpm. I'm probably way off, automotive drive trains aren't my forté. A more accurate guess could probably be calculated using the circumference of the wheels vs feet per minute traveled, divided by the ratio of your differential.
No problems with the motor overheating. I don't throw in whole stacks of magazines like with the no-tow mixer, I add paper relatively slowly and often use shredded paper. There is some vibration caused by my welding the pulley shaft on just a bit off center (not on purpose). That would be eliminated by coupling the shafts and losing the pulleys. This would also improve efficiency some. I don't often use this mixer, preferring the big no-tow beast for production.
I went back later and welded a small lip onto the trailing edge of the blades to make them more like propellers and generate some turbulence. Before that the mix didn't move much and took longer to pulp. An alternative would have been to twist the blades, but I didn't have a torch handy to heat them.
spaceman
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Please trim replies, especially ones with pictures. Many folks still have dialup connections.
On 4/28/2010 12:11 AM, Ron Richter wrote:
Spaceman,
Any idea what the blade RPM of a towmixer doing 10 to 15 MPH might be? I was wondering about a comparison to your 1750 rpm on the electric motor. Did you ever have a problem with overheat cutout on the 1Hp. motor?
Ron
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