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That guy is rather smart. Getting coordinates in Cartesian coordinates is difficult, but using plumbs and telescoping magnets is a brilliantly ghetto solution. It sounds perfect for items that can be +/- a couple millimeters, then bust out the calipers for small measurements.
I usually work in spherical, which sounds nuts, but it's easy to implement. Distances + angles. Rulers and string will give you point-to-point distances quite accurately. Up your precision by knotting 1 end of the string around a nail, and having a friend hold it. Redneck engineering! Magnetic angle finders will turn distances into positions. Of course you'd need a few quality reference parameters and some common sense "eyeballin' it" to ensure that the results mean anything.
What have you guys done to better understand your previous vehicles? For SAE Baja and Formula cars, we built from a model... this is reverse engineering an existing product, which I've only done a couple times. I stand to learn alot from you guys (and have high expectations!)
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