Rack Gears are gears used to convert circular motion to linear motion. Thanks to the teeth opening on a flat surface, the movement of a rotating gear is converted to progress in one direction. It is often used in automatic doors and drills. Between 1 Module and 7 Modules, Our Rack Types in Different Sizes Are Available in Our Stocks. Rack and pinion gears are manufactured from 1 to 16 modules with high precision in the fully automatic Rack Gear Opening Machine.