Tank (Modular)

thingiverse

My first project I wanted to build when I got my 3D printer was a remote control tank or something similar, like an FPV tank. So I set off with my Raspberry Pi and started testing how to control two DC motors and view where I am going. Using two ESCs, a PWM module connected to the Raspberry Pi, and some code, I'm able to control the motors perfectly. Now, all I need to do is connect a webcam via USB so I can see exactly where I'm heading. For now, though, it's still working out great! My project has already reached a fully functional state, and it was all achieved using just one weekend's worth of printing. Don't mind the random colors - it will get repainted later on when I finish it. For the challenge: Building an FPV tank is the perfect opportunity for kids to learn about 3D modeling, electronics, coding, and most importantly, sparking their creativity! However, it took me several attempts to finally complete it as I had yet to master its complexities. Nevertheless, with every obstacle I faced, my determination only grew stronger. To build your very own remote control tank powered by a Raspberry Pi, here are the necessary details you need: Print Settings: MakerBot Replicator Mini: Resolution: 0.3 mm Infill: 10% Rafts: No supports To build this amazing project, I first started by looking for inspiration on the web. I searched online and came across Vexrobotics.com - a fantastic resource for robots and DIY projects. They sell prototyping kits that allow users to create custom projects. While I initially thought of purchasing one of their kits, I realized that building everything from scratch would be far more interesting. With the idea stuck in my head, I took an old K'NEX frame and began creating a basic design to determine where the motors, treads, and wheels should be placed. From there, I took precise measurements of each component and started modeling in Tinkercad.com. Given my MakerBot Mini's limited build volume of 3.9 x 3.9 x 4.9 inches, I needed to use my problem-solving skills to design a modular system. It wasn't long before my tank prototype was completed, but it came with one major flaw - turning difficulties due to insufficient torque and excessive treads in contact with the ground. So what's next? Solution: One straightforward approach is adding a gearbox between the motor drive shaft and the tread-driven gears. However, I soon realized that I'd neglected this aspect initially when I directly mounted the treads onto the motor drive shaft, leading to poor starting torque. In the short term, an easier fix was to reduce the length of the tank's treads or shorten both the treads and frame itself. By simply lifting the rear end of my remote control tank off the ground with some effort, it was then able to turn smoothly! Reducing the number of treads in contact with the floor had done the trick, and now turning became much simpler.