How do I mount a wheel to the motors? All I've got is this little nub that barely fits anything. Right now my robot is being made out of cardboard.
A photo of what you have would be worth perhaps not a thousand but possibly a few hundred words!
A photo might be worth a few hundred laughs as well... You asked for it.
What do you guys do for making the body parts as well?
What do you guys do for making the body parts as well? I found myself at Lowes finding absolutely nothing useful for building the body. I may end up just getting a bunch of thin pieces of wood. I can't cut the aluminum they did have...
Quote from: teynon on Sep 17, 2013, 12:42 amA photo might be worth a few hundred laughs as well... You asked for it. I'm sorry to be the party-pooper here - but that ain't going to work at all.Discounting the duct tape and cardboard construction (and honestly, you would want the motors on the -other- side; on the "bottom" of the cardboard platform), the main reason it won't work is because those motors aren't gear motors; they won't have enough torque to move anything. You need to gear a DC motor down in order to generate enough torque to move. If those motors had some gearboxes on them, they'd work OK, most likely.For a table-top robot - you want a gearmotor with an output speed of around 100 RPM. You could attempt to build your own "gearing" with your setup. For instance, make a wheel with a jar lid, put a rubber band around it and the motor's drive shaft. You may need to hunt down something to use as a pulley on the drive shaft - a pencil eraser, perhaps? That might turn fast, but it would likely have enough torque then to move. You would also need to figure out a way to keep the rubber band on the pulley and on the jar lid; all doable, of course.Make that cardboard about half as wide as well - maybe about 6-8 inches wide, and about as long. Mount your wheels (jar lids) in the center; figure out an axle for them. Cut a ping-pong ball in half, stick one half on each end (on the bottom of the platform) - you may need a spacer of some sort - to act as a primitive "caster" wheel.Instead of cardboard, you may want to try foam-core board. Instead of duct tape - use hot glue.Also - I second the suggestion of using continuous rotation servos instead of gear-motors; just easier to work with, likely cheaper, too!
Obviously, this is not the end design goal. This is a stepping platform to ensure that I am able to make stuff connect and function (ie program it to do stuff).
The point of cardboard is that I can move stuff around. Right now I can just reposition stuff as needed.
Also, duck tape can hit up to 80 lbs per wrap. Just because it's not pretty and poorly done in the picture, doesn't mean it wouldn't work. Never underestimate the power of duck tape.
I bought a robot kit that came in the mail today and it has some elbow shaped motors that have the edges on the drives trimmed down to be non-circular. Some people at work suggested filing them as well.
This thing really struggles to turn.