Gears for Fischertechnik applications.

thingiverse

I designed three distinct models, each utilizing Autodesk Fusion 360 to create precise gear profiles through the add-in function. The gears feature a pressure angle of 20° and a backlash of 0.1mm, accounting for the slight dimensional increase during 3D printing. All sizes were drawn and tested using standard settings on the Flashforge Finder 3D printer with a fill percentage of 25%. I consistently employ the Brim option and Pelikan prefix Stick glue to ensure a secure bond. The smallest gear model boasts only 7 teeth, as smaller designs are not feasible with module 1.5. The gear version with Model 1 fits seamlessly onto FT parts like FT 35 063 and FT 35 064. I created a comprehensive gear range from 7 to 30 teeth using Model 1. In contrast, the gear model 2 is designed for mounting on a standard 4mm shaft, facilitated by a screw through a 3.2mm hole that can be tapped into an M4 thread or secured with a Parker screw. Model 2 features a range of 13 to 33 teeth, allowing for mounting on either steel or plastic FT components. Model 3 is intended for use with an adaptor, and spacers can be employed to mount multiple gears in succession, mimicking the configuration found on bicycle gear systems. Some gears are specifically designed to accommodate one or more neodymium magnets (D2x3mm), useful for home point or quadrature counter applications. The gears exhibit chamfered edges on one side to facilitate seamless chain integration, while the opposite edge is not beveled due to 3D printing constraints but remains unnecessary. The gear width has been adjusted accordingly. Model 3 gears feature six holes – three for standard 4mm openings and three for threading – which can accommodate M4 or Parker screws. I utilize an M4 wire tap and a low-speed hand drill to create the M4 threads, ensuring a swift and effortless process. A comprehensive table detailing gear ratios has been included, with increments of five teeth corresponding to an additional FT distance of 7.5mm. While some dimensions may vary depending on the 3D printer used, my Flashforge Finder 3D printer yields accurate results when printed with PLA Avistron or other suitable materials.