motiondave wrote:no I do not have an idea as to what gearboxes, this has probably been covered.
I am using 80:1 gearboxes, which multiply the torque of the motor by 80, while reducing the motor rpm by the same ratio.
The gearboxes I am using are not the most efficient, at about 77% efficiency.
This allowed me to lift the 105 pounds with a 0.25HP motor, without any issue.
The crank arm directly out of the gearbox was about 6" (15cm) long from the center of the gearbox axis, to the center of the arm that lifts the platform.
I think that this will be about the final size of the crank arm.
With a 0.5HP motor, I should be able to do whatever I need.
By the way, my platform will only have 4 motors for now (imagine where the wheels of a car would be) and will not have a center pivot.
No need with that power available.