A 8×8 crawler with 4 Motors for drives, steering, and exploration rover vehicle design.
A working lego microscope using a water drop, with dual light with down shutter.
A motorized Lego Crawler Grabber, featured drives with bogie suspension, auto tilting claw and raising and extending boom.
A small Motorized Wheel loader, featured drives, steering, light, lifted and tilted fork.
A mechanical calculator, which is capable to add and substrat, featured carry mechanism, keyboard, overflow mechanism and openable part for set up.
Here is the third part on my mechanical calculator machine, focused on overflow mechanism and how to make substraction.