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Pinion gears are small toothed gears used to drive racks and turn rotational motion into linear motion. Pinion gears are available in stem and wire forms. Stem pinions have a small number of teeth cut onto the end of a shaft. They work with spur gears instead of racks. Pinion wires are drawn through a die to cut gear teeth into the surface. They are typically used as gear prototypes or are made into smaller gears. They are also used in positioning applications.