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Illustrated Guide to Home Chemistry Experiments: All Lab, No Lecture by Robert Bruce Thompson
https://www.amazon.com/Illustrated-Guide-Home-Chemistry-Expe...
[1] https://library.sciencemadness.org/library/books/Brent_GBC.p...
You could build a sonar system, listen to ultrasound, or almost anything you can imagine, thanks to Moore's law and the massive amount of compute we have these days.
It’s free and nonprofit. There are 60 locations. Maybe one is near you?
Also, I like to reinforce the concept of “dreaming it up”, tell my kids to think of a thing to make and we break down the steps we think are needed to build it. At first, it’s like their imagination wasn’t big enough. They’d have an idea and I’d show them how we could build it pretty easily. Now, it’s gotten to where they know the skies the limit and anything of kind of possible so they start big and then work their way back down to a realistic scope of features. All to say, ask your kid what they want to build!
Building a fender-style guitar first is the easiest route, especially if you use a double-truss neck rod (get it from Stewart Mac). I recommend buying a pre-cut fret board as well. Also, you can use tung oil instead of clear coating. Trying to do an opaque spray job was my biggest regret. I could have oiled my beautiful mahogany body with much better results.
Tools:
* Flexible edge (for pegboard and body profile https://shop.pacificarc.us/products/flexible-edge-curves)
* Bandsaw (body and neck shape)
* Drill Press
* Router (For the neck and body cavities)
* Thickness planer (only need this once to plane the body wood before gluing)
* Curved carving knife (Like this https://ramelson.com/product/curved-hook-carving-knife/) to profile the neck.
* Pipe clamps
Nice to have tools:
* Oscillating spindle sander
* Belt sander
* Router table
I recommend using an easy to work wood like maple for the first attempt. I found mahogany to be a lot of effort to work. Expect the project to take quite a wile. I think mine took 200 hours.