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Rover
This is a go kart sized robot that I built with the intention of riding. It worked, but only ran off on one motorcycle battery, so you couldn't go very fast. The motors are directly connected to the wheels, which is probably really bad for them. I make things by oppertunity, and I haven't managed to find any gears yet, so its probably going to stay that way. I have considered using a belt drive system though. The front wheels turn using a drill found at a thrift store. I hooked a copper pipe to it and made a sort of winch. The pipe turns some rope, which turns the wheels in one direction or another. Hopefully I will later post some pictures of this.
One thing that the robot will have is a simple pneumatics system to handle various functions. I already have some equipment that I have played with and now have a small compressor, although it runs off of AC so I'll need to eventually get an inverter.
The wheels are made out of playwood circles. They have flanges in them with a slot cut out for the key that goes in the motor. A large nut screws onto the motor shaft to keep them in place.
I just got some solid state relays for it, but after hooking them up I discovered that once they are on, they don't turn off. This is because they have a thrysister my research indicates, which is designed for this effect. Unfortunately, this makes them useless to me, so now I am realising that I'll have to go back to older relays unless I can prove my research otherwise. Unfortunately, those relays make large clicking noises and can be sort of unreliable.