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 account of the rack is definitely a straight line rather than an involute (planar for the tooth surface) , equivalent to the indexing circle radius is definitely infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is right, each point in the tooth profile has the same pressure angle and is equal to the inclination position of the tooth profile. This angle is named the tooth position and the standard value is 20°.
(2) The same pitch and modulus are provided on any of the straight lines parallel to the very best line.
(3) A Coupling series parallel to the very best line of the tooth and having a tooth thickness equal to the width of the tooth groove is called 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 tip, high root height, tooth elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the gear is beating, the full tooth depth, the common normal series, 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 after the gears and racks are installed is suitable.
(3) The rack and gear meshing clearance should be 0.25* modulus.
(4) Whether the full tooth depth, runout, and common normal line of the rack are competent.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars
What is a gear rack?
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