Gear and Rack Product Introduction Gear rack is a special gear with teeth distributed on a bar. Rack is also divided into straight gear rack and helical gear rack, which are used in pairs with spur gears and helical gears respectively; the tooth profile of the rack is a straight line instead of an involute, which is equivalent to an infinite cylinder with an index circle radius gear. Features 1. Since the rack tooth profile is a straight line, each point on the tooth profile has the same pressure angle, which is equal to the inclination angle of the tooth profile. This angle is called the tooth profile angle, and the standard value is 20掳. 2. Any straight line parallel to the addendum line has the same pitch and module. 3. The straight line parallel to the tooth top line and the tooth thickness equal to the tooth slot width is called the index line (center line), which is the reference line for calculating the rack size The main parameters of the rack are Tooth slot width, tooth tip height, tooth root height, tooth height, tooth thickness, tooth root circle radius, etc. Preferences (1) Whether the gear's runout, full tooth depth, common normal, and tooth direction are qualified, whether the one-tooth swing and the pitch error are out of tolerance. (2) Whether the installation distance of the gear and rack after installation is appropriate. (3) The meshing clearance of the rack and gear should be 0.25*modulus. (4) Whether the full tooth depth, runout, common normal, and especially the tooth direction of the rack are qualified. Product Specification Our Company Packing, Storage, Handling and Transportation Gear and Rack website:http://www.hltcnc.com/gear-and-rack/