geargen

geargen is a command-line-based, CAD-independent generator for gears.

Features

• Spur gears
• Helical and herringbone gears
• Internal gears
• Bevel gears with arbitrary shaft angle

Usage

All parameters are specified by command line options. Distances are specified in millimeters and angles are specified in degrees.

Note: it only generates the essential part of a gear. Additional parts, such as the shaft bore or the hub, has to be added afterwards using CAD programs.

Spur gear

Spur gear with module 2, 16 teeth, and 10 mm width:

geargen -m 2 -n 16 -w 10 -o spur.step

• -m option specifies the value of module.
• -n specifies number of teeth.
• -w specifies gear width.
• -o specifies the name of a STEP file to be written.

Herringbone gear

Herringbone gear with helix angle of 30 degrees, module 1, 32 teeth, 10 mm width:

geargen -t herringbone -ha 30 -m 1 -n 32 -w 10 -o herringbone.step

• -t option changes gear type. Also helical gears can be generated with -t helical.
• -ha specifies helix angle (default 20 deg).

Internal gear

Internal spur gear with module 1, 50 teeth, 10 mm width, and outer diameter of 60 mm:

geargen -t internal -m 1 -n 50 -w 10 -od 60 -o internal.step

• -t internal means internal spur gear. -t internal_helical and -t internal_herringbone are also supported.
• -od specifies outer diameter.

Bevel gear

Bevel gear with module 1, 20 teeth, and 10 mm facewidth, meshes with a 40-teeth gear at 90 degrees:

geargen -t bevel -m 1 -n 20 -w 10 -nc 40 -sa 90 -o bevel.step

• -nc option specifies number of teeth of the counterpart.
• -sa specifies shaft angle (default 90 deg).

TODO

• Profile shifting
• Timing belt profile (GT2)