Sunday, June 29, 2008
Pedal Tractor Progress
I got the big wheels welded up yesterday on the Seussian Pedal Tractor. They are six feet in diameter and there are two of them. They each have sixteen spokes. Each spoke will have a shoe attached to it. I also started building the main axle. Three chains from the pedals will go to freewheels on the jack shaft. Then a beefier chain runs from the jack shaft to the drive sprocket on the main shaft. The big unknown is the gearing. I am using a 20 tooth sprocket on the main shaft which will be driven by a 10 tooth sprocket on the jack shaft. This will gear down by half. I have left room in the differential for a 30 tooth gear in case the gear down is not enough. I want it to be relatively easy to pedal around. It probably won't be fast but that's fine with me.
The next step is to attach the extended bicycle frame to the axle housing and work out the seat placement and placement for the rear pedals.