Involute spur gear designer

Draw an external spur tooth from module or diametral pitch, pressure angle, and profile shift. The flank is a true involute of the base circle. Download a 1:1 SVG, or check center distance and contact ratio against a mating gear.

m 2 · z 24 · 20° · x 0

Pitch

Module mm Number of teeth

Pressure angle ° Profile shift coefficient, x

Tooth proportions

Addendum factor, h_a* Dedendum factor, h_f* Root fillet radius, × module Tip radius, × module Backlash allowance mm Circular backlash removed from this gear only. Zero is a tight mesh.

Mating gear

Number of teeth Profile shift coefficient

Gear
Mate
Pitch
Base
Outside
Root
Line of action

This gear (mm)

Mesh

The flank between the base circle and the tip is an involute. Read the involute curve, profile shift, module and diametral pitch, undercut, and how to draw a gear in CAD.