Gear rack is a particular gear whose teeth are distributed on the strip.
1. The basic concept:
The rack can be divided into a spur gear rack and a helical gear rack, which are paired with a spur gear and a helical gear, respectively; the tooth profile of the rack is normally a straight line instead of an involute (planar for the tooth surface) , equal to the indexing circle radius is definitely infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is direct, each point on the tooth profile gets the same pressure angle and is equal to the inclination angle of the tooth profile. This angle is called the tooth angle and the typical value is 20°.
(2) The same pitch and modulus are 
provided on any of the right lines parallel to the very best line.
(3) A collection parallel to the very best line of the tooth and having a tooth thickness add up to the width of the tooth groove is called a dividing collection (middle line), which is a reference line for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root elevation, tooth elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the equipment is beating, the entire tooth depth, the normal normal collection, the tooth path is qualified, the tooth pitch is poor, and the circumferential section error has gone out of tolerance.
(2) If the installation distance following the gears and racks are installed is suitable.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the complete tooth depth, runout, and common normal line of the rack are qualified.
5. Taper Pulleys Processing methods:
Gear rack and pinion machining technique:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars
