Rack and Pinion Driven Linear Module

Rack and Pinion Linear Modules mechanism is composed of gears and racks. Rack is divided into straight rack and helical rack. The tooth profile of the rack is a straight line rather than an involute (for the tooth surface, it is a plane), which is equivalent to a cylindrical gear with an infinite indexing circle radius.
Main features of Rack-Rack and Pinion Linear Modules:
(1) Since the rack tooth profile is a straight line, each point on the tooth profile has the same pressure angle and is equal to the inclination angle of the tooth profile. This angle is called the tooth profile angle, and the standard value is 20 °.
(2) Any straight line parallel to the tooth top line has the same tooth pitch and modulus.
(3) The straight line parallel to the tooth top line and the tooth thickness is equal to the tooth slot width is called the dividing line (center line), which is the datum line for calculating the size of the rack