Step 6: Pendulum Production

Straighten a 3" piece of thick copper wire.

Strip 1" of insulation from one end.

Strip 1/2" of insulation from the other end, and bend into a loop.

Melt/burn/cut away the insulation from an 8" length of thin magnet wire.
Solder it to the bent end of the thick copper wire.

Solder three guitar string "ferrules" to the other end of the copper wire. They grab the solder quite well when heated a bit! If you don't have a source for these, use something else: a big solder blob will serve, all you need is a little weight.

Make four of these.
I'm having my high school physics students build these - I thought it would be pretty straight forward but it's turning out to be quite difficult for some. I love seeing them become frustrated and having to step back and rethink the overall concept of which direction the electricity is actually flowing. Thank you for taking the time to post all your HD motor projects. Can you offer any suggestions to my students? Some of the motors have 4 contacts and others have 3. It seems diagnosing the motor and determining which contact does what is the key to creating the individual circuits.
An honor, sir! Many thanks!<br/><br/>Suggestions?<br/>-For the real story on fiddling with hard drive motors, look no further than here:<br/><a rel="nofollow" href="http://www.epanorama.net/circuits/diskstepper.html">http://www.epanorama.net/circuits/diskstepper.html</a><br/><br/>-Make a wind belt generator with the remaining hard drive bits.<br/><br/>-Both Twitchy and Twitchy II are still in operation at my desk at work. I've found that the copper contacts tend to suffer from gray gook building up that seems to quite effectively block the current; a quick filing/sanding brings it all back to life.<br/><br/>-I changed to a lower amperage/higher voltage power supply that really increased the boogie!<br/><br/>-The nice thing about this project is that the pressure is off: it doesn't need to do anything but twitch randomly, so you can decide how to wire up a 3- or 4-wire motor just by connecting one of the motor terminals to DC + and poking at the other terminals with DC - until two (or three) terminals are found which illicit a twitch. And which is + and which is - doesn't matter either!<br/><br/>-Please let me know how it goes, I'd love to see a classroom full of permutations!<br/><br/>Best of luck!<br/><br/>Mike<br/>
Very nice! Can you tell me the name of the singer please?
Thank you!<br/><br/>The singer is me: <a rel="nofollow" href="http://www.humboldtmusic.com/mc">humboldtmusic.com/mc</a><br/><br/>Mike<br/>
haha funny!!!!!!!!!!!

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