Electromagnetism demonstrator v2

I built another electromagnetism demonstration device for the Spark Museum. I wanted to make one where the needle was actually moved by electromagnetic action, not mechanically as the previous version was done. Pretty much everything was made on the Glowforge.

The 16" compass face was cut from Home Depot white/blackboard (whiteboard on one side, blackboard on the other). This stuff engraves amazingly well, with pure black engraved areas. The legs were made from Plywood that I had finished previously. The coil form and surrounding box for the Schweigger Multiplier were cut from acrylic. The heart of the thing is a little piece that I cut out of acetal, that holds a neodymium rare -earth magnet. I had to have a tapped hole for the meter shaft that went perfectly through the center of the two tabs. After a few failed attempts to get it centered I had the idea to cut a rectangle around the holder and use that as a reference to drill & tap the hole. It worked great. Here are some photos:





Edit: Here is a short video of it operating.

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Just let me say I’m not at all surprised at the elegance of this effort.
I could die a happy man just wandering from machine to machine in your shop, excited - anticipating the next operation. :star_struck:
The glowforge fit nicely in that array of tools and abilities.

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If you ever make it to the northwest, let me know!

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It’s beautiful, as is everything you have made!

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Very, very cool.

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Wow, that is impressive!

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Very cool project! The black engrave looks really nice. I’ll have to try the white /blackboard.

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Wow! What fun!

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I want to go just to see the museum and you. If I had had this museum in my childhood, who knows what it would have inspired.

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That is exactly my hope. We have busloads of kids (at least we did before Covid) come in every week and most of them leave pretty excited & inspired about science. It’s really fun to watch.

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