Gearotic is a CAD/CAM 3D software package aimed to assist with any geared mechanical creations and much more. It was primarily designed as a gear template generator, but software has developed into a great utility package we hope you'll find interesting and handy. An involute curve is fairly easy to calculate and quite a number of freely available tools and scripts exist that use this fact to create involute gear profiles (see e.g., Gear template generator, Parametric Involute Bevel and Spur Gears, OpenJsCad’s gear demo, and many more). However, I have not found a freely available tool that correctly.
3D models for gears can be created different ways - each way has pros and cons. Calculate parameters for gears manually - diameters of gear wheels, angles of teeth, etc. Create a 3D model in CAD software. Print models, test, correct, repeat.Measure existing gears and use these parameters to create 3D model in CAD in the way as above.
It's not easy to find gears similar to needed (even when they can be scaled). Take the photo of existing gears (e.g from a toy car), print it scaled, put on the display and draw the 2D geometry in CAD - to reproduce gear's shape. This is more easy than in previous steps, but also required to find similar gears (or at least their picture).
Use graphics software with build in gear-generation features. E.g Inkscape (graphics editor with extension which renders a gears), FreeCAD (free CAD software), etc. Use a program which generates geometry of gears by specified parameters - this way is describes in this video instruction.Software used in this instruction:. this is not free software. It allows to generate 2D geometry of gears and export it to dxf-file.
this is free software which allows to create quick and easy mechanical models for prototypes. This product allows to create models the way similar to - but more simple.
Version 6 has a great new feature - export 2D geometry on a workplane, this feature is used in the instruction. this is free software which allows to fix STL-geometry or rotate parts. this is free software (with additional features available in purchased version). Prepare STL-geometry for 3D printing - slices and translates to G-codes.