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 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 instead of an involute (planar for the tooth surface) , equivalent to the indexing circle radius is 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 called the tooth position and the standard value is 20°.
(2) The same pitch and modulus are provided on the right lines parallel to the top line.
(3) A series 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 collection 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 gear is beating, the entire tooth depth, the common normal collection, the tooth path is qualified, the tooth pitch is poor, and the circumferential section error has gone out of Shaft Collar tolerance.
(2) Whether 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 experienced.
5. Processing methods:
Gear rack and pinion machining technique:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars