28BYJ-48 stepper motor to LEGO axel

thingiverse

Introduction Gregor von Laszewski You will be able to create an adapter between the 28BYJ-48 stepper motor and a LEGO axle. As it turns out this part is quite dependent on the printer and its settings, and thus you will probably have to adjust it for your printer. Thus, the model needs to be modified. To do so, you will need OpenSCAD on your computer and download the scad model and modify. You will do this in two phases. Phase 1: Find approximate parameters via test prints The SCAD contains a number of variables. To set it in testing mode, use final = false; Now you can adjust the parameters for the LEGO attachment axis_wcross, which is the width of the LEGO cross, and axis_wbeam, which is the width of a tiny section that builds the cross. To change the values for the stepper motor, use motor_width, which is the width of the square to the stepper motor, and motor_length, which is the length of the square to the stepper motor. Find some values that will work. If one of the tests is successful, you can switch it off by using either cross_test = false; or axil_test = false;. Whenever you make a change, make sure to press the Render F6 button before exporting and saving the model. This assures you get the newest model exported. Phase 2: Finalize the print and parameters Once you have found suitable values, you need to finalize. This is needed because printing a larger model behaves slightly different due to cooling differences. Set the variable final = true; and print. If you need adjustments, just do it as you have done previously while adjusting the parameters. Do only print one item at a time. As you will get different behavior if you print multiple due to different cooling behavior. Once you are satisfied, save the settings and print one adapter at a time. Outlook Unfortunately, I could not find nice tires for the stepper motor, otherwise I would not have done this. However, LEGO tires are readily available. With this, I am able to create a new 2WD Robot Car platform to demonstrate usage of esp8266, arduino, and raspberry PI 3. Once I have settled on a base and attached the motors, I hope to update you. Printer I have a DaVinci Mini Maker printer. You can find more information at http://us.store.xyzprinting.com/us_en/catalog/printer/daVinciminiMaker. Acknowledgement This project is a modified version of http://www.thingiverse.com/thing:2138148. Print Settings Printer: xyz printing DaVinci MiniMaker Rafts: No Supports: No Resolution: custom Infill: Rectilinear Notes: Material: PLA Infill Density: low 10% Layer Height: 0.4 Shells: Thin Speed: Fast How I Designed This I used OpenSCAD to design this project.