Gear rack is a special gear whose teeth are distributed in 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 rather than an involute (Screw Air Compressors planar for the tooth surface) , equivalent to the indexing circle radius can be infinite cylindrical gear.
2. The main features:
(1) Since the tooth profile of the rack is direct, each point on 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 typical value is 20°.
(2) The same pitch and modulus are given on the straight lines parallel to the top line.
(3) A line parallel to the top line of the tooth and having a tooth thickness add up to the width of the tooth groove is named a dividing collection (middle line), which really is a reference line for calculating the size of 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 equipment is beating, the full tooth depth, the normal normal range, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section error has gone out of tolerance.
(2) Whether the installation distance following the gears and racks are installed is appropriate.
(3) The rack and gear meshing clearance ought to be 0.25* modulus.
(4) Whether the complete tooth depth, runout, and common normal line of the rack are experienced.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars
