gear torture test

cults3d

I'm curious to know if a 3D printed gear can handle more torque than a Nema 23 stepper motor. I decided to design a destructive test to find out which gear design and material is suitable. Here are the results: https://youtu.be/Ik0hf_iBz6g Initially, I was pleased to discover that the PLA and PETG gears I wanted to use can withstand 9 to 12Nm of torque, which is four to six times the holding torque of the strongest Nema 23 stepper motor available (2Nm). If excessive torque occurs, I may lose steps but not damage my gear, at least for static loads. I chose to use PETG because it can handle the required torque and I expect better performance than PLA if friction generates heat. Interestingly, the ABS version failed relatively quickly. I suspect this is due to poor quality of the ABS material. If you're interested in testing it yourself, you'll need: * A hanging scale with a capacity of at least 20kg * Some strings * Three M5x50 screws (recommended DIN 603 carriage bolts) * Three M5 nuts * A camera You can use each sample for two tests and don't forget to share your results as a comment or make. Here are the parameters of the gear: * Double helical design * Module: 1mm * Teeth count: 18 * Pitch diameter: 20.785mm * Thickness: 15mm (2 x 7.5mm) * Designed using Fusion 360's helical gear tool Materials used: * PLA white from Hobbyking * PETG bronze from Das Filament * ABS blue from Hobbyking