What is a gear rack?

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 account of the rack is certainly a straight line rather than an involute (planar for the tooth surface) , equal to the indexing circle radius is infinite cylindrical gear.
2. The main features:
(1) Because the tooth profile of the rack is direct, each point about the tooth profile has the same pressure angle and is add up to the inclination angle of the tooth profile. This angle is called the tooth position and the standard value is 20°.
(2) The same pitch and modulus are given on the right lines parallel to the very best line.
(3) A series parallel to the top type of the tooth and having a tooth thickness add up to the width of the tooth groove is named a dividing series (middle line), which really is a reference collection for calculating how big is the rack.
3. The main parameters:
Groove width, high tooth tip, high root elevation, tooth elevation, tooth thickness, root radius, etc.
4. The decision of parameters:
(1) Whether the equipment is beating, the full tooth depth, the common normal collection, the tooth direction is qualified, the tooth pitch is poor, and the circumferential section error is out of tolerance.
(2) If the installation distance after the gears and racks are installed is suitable.
(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 competent.
5. Processing methods:
Gear rack and pinion machining method:
(1) hobbing
(2) gear shaping
(3) shaving
(4) grinding teeth
(5) molars

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