Step 1: Hopping Our Way
- a frame (1/32" sheet metal)
- legs (marking flag wire)
- battery pack (from Radio Shack)
- switch (also from Radio Shack)
- red and black wire (20-24 gauge, though in a pinch, CAT-5 cable will work, but double it up))
- 2 small wire ties (long enough to wrap around your motor)
- off-center weight (2" of thin-walled, 1" electrical conduit)
Tools you'll need:
- Permanent marker
- Hack saw/rotary cutter/tin snip (and a file, depending on your cutting skills)
- Pliers (fairly heavy, you'll need to bend the wire)
- wire cutters/stripper
- soldering iron
- hot-glue gun
I got interested in these when looking at BEAM mechanics. I've got another set of these that will use a simple photovore head to control two counter-rotating weights to follow a light source. However, this tutorial shows the basics of building the form.
You'll start with small L-shaped piece of sheet metal. I find that the guts of flat-bed scanners have all kinds of good stuff in them. The legs are made from a single piece of wire, and I use the 18" wire marking flags for can get from Lowes or Home Depot. Switches and motors came from Radio Shack .
The template below is the frame of the bot. The Sketchup files are included, as well.
Print out the template and mark it on your sheet-metal, or just mark it out. Cut along the solid lines, and make sure you end up with the same number of fingers as you started with.
Step 2: The Bends
Finally, bend the frame into the shape shown below.
Step 3: Legs of Iron
Step 4: Bringin' It Together
Then, wire-tie the motor to the top of the mast. Use two ties.
Attach the switch in the hole you drilled, or hot-glue/epoxy it on.
Then, hot-glue/epoxy the battery box to the bottom - making sure that you can change the batteries.
When all of the parts are attached, solder the circuit together (see the crudely drawn wiring digram).
Finally, drill a hole in the pipe. Start with about 7/8" in from one end. File the hole clean and glue/epoxy it onto the motor shaft.
Step 5: Fire It Up!
Bend the legs or frame around to change the behaviors. Enjoy!