Gears and equipment racks use rotation to transmit torque, alter speeds, and alter directions. Gears come in many different forms. Spur gears are fundamental, straight-toothed gears that run parallel to the axis of rotation. Helical gears have angled teeth that steadily engage matching the teeth for smooth, quiet procedure. Bevel and miter gears are conical gears that operate at a right angle and transfer motion between perpendicular shafts. Change gears maintain a specific input speed and allow different output speeds. Gears are often paired with gear racks, which are linear, toothed bars found in rack and pinion systems. The apparatus rotates to drive the rack’s linear motion. Gear racks provide more feedback than various other steering mechanisms.