Gears produce a range of movements that can be used to control the speed of action.
Gears are comparable to continuously applied levers, as one tooth is engaging, another is disengaging.
When these gears turn the attached arms open and close.
Pulleys are an important part of most machines. Pulleys are simply gears without
teeth and instead of running together directly they are made to drive one another by cables or
belting of some kinds. As with gears, the velocities of pulleys are inversely proportional to their diameters.
- Belts (rubberbands) were not the proper length.
- Pulleys on the handcrank were the wrong size. Pulleys on the large wheels needed to be larger then the handcrank pulleys.