[Justin M.]

Originally Posted by AdamHeard

Well, the AndyMark gearboxes only have a 3.67: 1 reduction, So those won't work.

The KOP fisherprice gearboxes have a 124:1 reduction.

Also, you say 40 lbs but we need more information to do calculations. Is it lifted straight, is it a lever arm?

Is the shaft of the BB directly driving the arm, or is chain? If there is chain, you can easily add more reduction in the sprockets.

It's a forklift. It's going to move by a chain system, with a sprocket mounted on the shaft and also directly overhead. We're bolting the chain directly to the forklift, so when the motor turns, the forklift goes up. I was thinking about reduction, but the torque needs to be transferred directly to the chain "pulling power", not the sprocket on the other end. Also the chain needs to be somewhat straight, so the two sprockets need to be about the same size.

I was thinking about reducing the gearbox directly by using some gears or something...like a gear mounted on the output shaft of the 64:1 gearbox, turning a larger gear mounted directly to a sprocket, which in turn transfers the torque to the right place.