Here’s a Handmade 20,000RPM Nitro-Powered Rotary Tool
The video is long but filled with lots of beautiful machining shots. The device gets revved up shortly after the 18:00 mark and demonstrated on various materials – awesome!
And here’s a bit more context about this project:
After the nitro drill, I wanted to try and make similar projects with this kind of rc engines. Unfortunately, success didn’t come fast because I had to remake the whole build 3 times. I started with a Cox 049 (0.8cc) airplane engine which is very delicate concerning the fuel mixture as it requires at least 15% pure castor oil. Modern fuel blends include a small percentage of this oil, with the rest being synthetic. This lead to its failure due to the overheating of the crankshaft, which rubbed against the crankcase walls naking it useless. The second engine I used was also for model airplanes, a O.S Max 10 RC (1.6cc) from the 70’s. This one while it didn’t need special fuel blends, it was really difficult to start, not because it was stubborn, but of the way I made the tool to start: by spinning the flywheel with my thumb. It was almost impossible to make it start like this. Only a few times the engine run, but for a few seconds. Then I thought I should use the kyosho gx-12 (2.1cc). It had a pull starter, which meant no more trouble with starting up the engine. It’s also more modern than the previous two engines, so it was the absolute winner of the 3.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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