Exactly what is a gear rack?

Gear rack is a particular gear whose teeth are distributed in the strip.
1. The basic concept:
The rack is also split into a spur gear rack and a helical gear rack, which are paired with a spur gear and a helical gear, respectively; the tooth account of the rack is normally a straight line instead of an involute (planar for the tooth surface) , equivalent to the indexing circle radius is certainly infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is right, each point about the tooth profile gets the same pressure position and is equal to the inclination angle of the tooth profile. This angle is named the tooth position and the typical value is 20°.
(2) The same pitch and modulus are given on the direct lines parallel to the top line.
(3) A range parallel to the very best line of the tooth and having a tooth thickness equal to the width of the tooth groove is named a dividing line (middle line), which is a reference series for calculating the size of the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root height, 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 series, the tooth path is qualified, the tooth pitch is poor, and the circumferential section error has gone out of tolerance.
(2) Whether the installation distance after the gears and racks are installed is appropriate.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the complete tooth depth, runout, and common normal type of the rack are qualified.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars