We can use various systems to change the direction of rotation or the axis of rotation in a belt drive. We can also vary the distance between the wheels. With belts, we can change the direction of rotation and the axis of rotation quite easily. However, gear drives require special parts to make these changes. We use different types of gears when two axes are parallel, perpendicular or crossed.
In some gear mechanisms, several cogs or theeth interlock at the same time. These mechanisms are more precise and they transmit more rotary force, or torque.
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