After building a business using a now 112 year old, treadle powered printing press I was sold on the ability of human powered machines. My press was 1000 lbs of cast iron that moved like butter under the gentle press of my foot. I’m dreaming of a fully off-grid workshop, utilizing human and direct solar power. Aside from boatloads of research and experimentation, this is my first attempt at making this dream a reality. So far I’ve got a working frame and drivechain. I hope to install a sprocket onto the bandsaw and have it running shortly. I fully expect to tear it apart and rebuild it a few times. That being said, the first major problem I’ve found is with the direction of rotation. I’m orser to pedal while cutting the rider has to pedal backwards. The best solution for inverting roller chain involves 4 sprockets. Any other ideas that won’t cost much more than free?
to reverse the direction of the chain, make it into a figure-eight. the trick then is to keep the chain from rubbing against itself. I can think of a couple ways to do that, but I'm guessing you can, too.
for all but the lightest work, I think you'll probably want a stout flywheel involved if there isn't one already. maybe the existing bandsaw wheels are enough, though.
I don't know if this would introduce new problems like increased friction or earlier failure, but if the chain sprocket under the saw had a gear next to the sprocket, on the same shaft, and that drove a gear on the same shaft as the pulley or whatever drives the saw blade, I'm pretty sure that would reverse the direction.
I know that's a run on sentence. Let me know if it's unclear. Maybe I could draw something or mark my idea on your photo.