I've always said that since disposing of the "beige box", Apple has always led in the industrial design area. The integration of form and function can't be touched by any other manufacturer in any industry (Porsche comes close). It's a shame to clog up landfills with something attractive and durable just because it's original use is moot.
For this instructable you will need (ideally):
Apple Pro Speakers
a 12v motor with a shaft diameter not bigger than 1/8" and a housing no deeper than 2" (The ideal motor should have 3 or 6 threaded holes on the output side. The one I used was a samsung capstan motor from a trashed video deck. The most important things are the threaded holes)
a rubber band
a big nail
super glue, or really, really good glue, let's not get too high on ourselves now
a reamer-like file (I used an old phillips screwdriver, I had time to kill)
bolts that fit the threaded holes on your motor
a 9-volt battery
a 9-volt battery connector with useable leads (see parts source in the next item)
on-off switch (destroy one of your, or your friends' children's battery-powered toys - they need to use their imagination more anyway!)
soldering iron (or you could forgo the switch and soldering iron and just twist everything together)
a wheel from the toy you busted up - minimum diameter 1 3/4"
1 bottlecap leftover from your Laptop stand from 4 bottlecaps
3 nails or other hard, metal, pointy things
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Step 1: Disassemble the Apple Pro Speakers
OK, I could make a whole instructable about this, but the only thing you need to know; the keystone of the Apple Pro Speaker is the little metal collar that the wire comes out of. Pull the grill off the front, then use 3 screwdrivers or short nails, as long as you take one in each of your 3 hands, insert them in the holes, and rotate the collar out. Claw scratch and hack everything else out of the speaker housing. You want to get rid of the wires and the speaker.
Step 2: ...but Can It Core a Apple Pro Speaker, Oh Chef O' the Future?
Once you get that metal collar off the back, you can actually yank out the plastic "core" in the middle. In this shot the metal that the speaker was attached to is still connected to the core. You should remove that, too.
Step 3: Admire the Hunk.
Here's what I call the Hunk. It's a hunk of plastic that everything goes into. We can stop here and you can have a change tray, a place to stuff your keys, the worst thing to shine the laser pointer into when playing with the cat, an interesting fish-eye lens (now that I'm actually LOOKING at the shot I took), but, for the love of Pete, whatever you do - DON'T use it as an ashtray. Smoking kills more than burning plastic fumes.
Have a beer.
Step 4: No Guts, No Glory
Make certain your drivetrain works. Be sure the wheel fits on the axle and that the axle spins freely when you touch the leads to a battery. Always check stuff like this beforehand.
Step 5: How to Eyeball Like a Pro
Stick the shaft of the motor through the wire hole on the back of the core. If your motor is too shallow, shove a bottlecap under it to prop it up.
See how gravity kind of "wants" to center it? If your motor has 6 holes, line up your target holes along the plastic "beams" and the other 3 hole along the curves of the outsides of the "beams". Now, using flame and a big nail, burn holes through the plastic directly above the threaded holes in the motor. Try not to go all the way through. The last thing you want is molten plastic dribbling into the motor. Use your reamer-like thingy to file out the holes.
A lot of this project is subjective. I just happen to be a packrat when it comes to tools, fasteners, and gadgets. I just happened to have the perfect size bolts for the right size motor for the speakers. It was a personal trifecta in my case. Try to do your best with what you have.
Step 6: Screw It
I mean BOLT it, of course. the most important thing here is that the shaft of the motor not touch the sides of the hole in the core. Believe it or not, there's a LOT of maneuverability built into this step. You can either file/ream out the holes more for the bolts to slide down into them, or you can loosen one side and tighten the other 2. Either way, it's not too difficult to manage to center it almost dead on. Hindsight being 20/20, and according to the pic, I think I need to adjust it a little myself!
Note: you don't want bolts that are too long. Make sure they JUST go into the motor housing. Too deep and you'll damage the motor.
Step 7: Ooh, Can It Core a Apple...
Shove the guts into the Hunk. There's a rubber gasket that will invariably get twisted while doing this. Use one of the pointy things to shove it into place around the diameter of where the core and Hunk come together. I couldn't get in tight enough with my craptastic camera to get a good shot of it. If you've gotten this far you'll know what I mean.
Note in my pic: I used a rubber band to hold the wires in tighter in case the whole thing flew apart.
Step 8: External Input Device
Stick a switch there! Take the red lead from the 9-volt battery connector, solder it to the middle leg of the switch (or 1 of the 2 legs of the switch, depending on what kind of switch you tore out of the kids' toy was) and solder a lead from the motor to the other leg. Connect the other lead from the motor to the other lead of the battery connector.
Wire the battery to the motor as needed, but you have to stick the grill back on or the speaker will get hung up on the opening.
Forgive the blur.
Step 9: Self-centering
NOT PICTURED BUT IMPORTANT: inside the metal collar is this little rubber gasket. Those Apple guys think of everything. It looks like it's used to alleviate pressure on the speaker wire.
Here's, I think, my favorite part: when you screw the metal collar back on (remember to use all 3 arms), the motor self-centers
Step 10: Get Your Motor Runnin'
Slap the little wheel on the end of the axle (a dab of superglue is most efficacious), connect a 9-volt and give your creation life!
Full-disclosure statement: The bolts I used to attach the motor to the core had round heads and they're preventing me from pushing the grill all the way on. Yes, ghetto though it may seem, that is tape on the grill, but it's "invisible" tape so you can't see it, right?
Step 11: Creating a Black Hole in My Office
Have a beer.
If you stand it on the flat part of the housing and you have exactly the same size wheel that I'm using, the speaker WILL just sit there. note in the video if you start it "upside-down" the weight of the motor will cause it to touch the wheel to the floor when it starts to slow down. Then the wheel gets it going again.
Now do the right thing and give this to the kid whose toy you broke. Nah, screw him. He can build his own. Finish the beer and play!