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 profile of the rack can be 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) Because the tooth profile of the rack is straight, each point on the tooth profile has the same pressure angle and is add up 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 the direct lines parallel to the top line.
(3) A range parallel to the very best type of the tooth and having a tooth thickness add up to the width of the tooth groove is called a dividing series (middle line), which is a reference range for calculating the size of the rack.
3. The main Cast Iron parameters:
Groove width, high tooth tip, high root elevation, tooth elevation, tooth thickness, root radius, etc.
4. The choice of parameters:
(1) Whether the equipment is beating, the entire tooth depth, the common normal line, the tooth path 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 appropriate.
(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 method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars