A very compact lego automatic transmission. A pneumatic cylinder provides reliable shifting. The gearing is very strong and I plan to use it in a trial truck soon.
A giant, fast, and all-around awesome 8×8 LPE-powered trial truck built for my 1000 subscriber special. Thanks to all of my subscribers for getting me this far. Lots of fun new projects in the near future. Video:
The internals for a little project I’m working on:
A little project that I’ve been working on for a few months. It is a semi-auto paintball gun, powered by compressed air. It uses a homemade, quick-acting piston valve to fire. Triggering is done by a blowgun valve located, well, at the trigger. Very fun project, and I can get lots of shots off of my back-pack mounted air tank. And of course, a little video showcasing some of it’s features:
And A video of it with a new barrel, shooting nail darts and marbles. This was really fun:
A lego pneumatic engine I made. It uses DrDudeNL’s concept of the “sliding yoke” as opposed to traditional scotch yoke. Only original, non-modified Lego parts were used. Runs very smoothly, even for not having modified parts. It is VERY torquey, and would be great for a trial truck if you had a portable air compressor. Video:
A test LPE I made. It uses “sliders” opposed to directly attatching the cylinder to the camshaft. It runs okay, but more cylinders will be better. Video:
World first! I modified slightly my earlier design for an automatic transmission so it could work well in a trial truck. I had to change around some of the gears and supports so that it wouldn’t slip in first or second gear. I also changed the gear-shift mechanism so that it is all lego, no rubber band but instead a spring. It works very well, downshifts going over an obstacle for more torque, then upshifts again for speed when over the obstacle. The trial truck is a quite simple design, it uses my axles from rock crawler project and 3 link flexible live axle suspension. XL motor for power, m with worm gear reduction for steering. Video:
The final version of my automatic gearbox, this time using a mechanical “torque sensor” to shift a pneumatic valve, thus changing gears to a lower ratio, giving it more torque for an obstacle. Then, when the resistance on the output shaft lowers, the valve changes directions again, switching the gear back to high speed. Ratios are 1:1 for high speed and 9:25 for the low speed. Video:
A simple two speed gearbox shifted by two mini pneumatic pistons. Its gear ratios are 5:3 and 3:5. Very robusta nd durable, great for trial truck. Video:
A fun project I built. Small and compact, it could be used in a minifig car, however this has very little torque. Top speed is estimated above 5000 RPMs.