How to draw a spur gear involute profile in AutoCAD / GStarCAD / ZwCAD
The tooth form most commonly used today for power transmission gears, is the involute profile.
Check the following video:
The definition of the involute curve is - the curve traced by a point on a straight line, which rolls
without slipping the circle. The circle is called the base circle of the involute. Check the RATIONALE here OR here.
With the center of the base circle at the origin of a coordinate system, the involute curve can be expressed by a
pair of X and Y formulas, which transcribed into LitioLAB’s format are as follows: