What is a gear rack?

Gear rack is a particular gear whose teeth are distributed in the strip.
1. The basic concept:
The rack can be 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 certainly a straight line rather than an involute (planar for the tooth surface) , equivalent to the indexing circle radius is usually infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is right, each point in 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 standard value is 20°.
(2) The same pitch and modulus are provided on any of 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 really is a reference line for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth suggestion, high root height, tooth height, tooth thickness, root radius, etc.
4. The choice of parameters:
(1) Whether the gear is beating, the full tooth depth, the common normal range, the tooth direction 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 appropriate.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal type of the rack are skilled.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars