GearStudio: planetary gear generator and CAD export

GearStudio is a browser tool for designing involute planetary (epicyclic) gear sets, spur or helical, and exporting them to CAD. Pick tooth counts and a module or diametral pitch, and it computes true involute tooth flanks with trochoidal root fillets, checks that the set will assemble, animates it in 2D and 3D, rates the teeth for strength, and exports files ready for CNC machining, laser cutting or 3D printing.

Designing, checking and animating a gear set is free, and so is SVG export with an account. GearStudio Pro adds STEP, STL and DXF export of your own designs and the AGMA stress results. Anyone can download a free STEP, STL or DXF sample of the default design to try in their own CAD tool, and the stress guide has a free calculator.

• Planetary gear ratio calculator for any choice of fixed and input member
• Spur and helical gears in metric module or inch diametral pitch, with pressure angle, profile shift and backlash
• Undercut, contact ratio and assembly checks: coaxial, equal spacing and planet clearance
• AGMA 2001 bending and contact stress with AGMA 908 J and I factors, planet load sharing and design factors (Pro)
• Export to SVG (free with an account), or STEP, STL and DXF (Pro)

Guides: planetary gear ratio calculator, planetary assembly conditions, undercut and profile shift, module vs diametral pitch, gear stress analysis (Lewis and AGMA), STEP vs STL vs DXF for gears.