What cheap setup or technique works for truly flat photos for use in CAD? (lemmy.world)

submitted 3 days ago by j4k3@lemmy.world to c/asklemmy@lemmy.world

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I've managed to do reverse engineering of circuit boards using GIMP and rough alignment of layers using images like the one pictured. I want to use images to reverse engineer parts in CAD, but the minor lens distortion of a camera on a phone at ~20cm high on top of a stack of objects to keep it eyeballed flat is not enough. The result is off in multiple planes. There are minor errors in my curves in the transparent CAD part pictured, but the hole pattern is correct. The picture has been calibrated to 20mm against the ruler. Any suggestions on how to make this usable for replicating the ellipse that crosses the holes ±0.05mm?

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[-] IMALlama@lemmy.world 2 points 3 days ago

The scanner will only work if your model is absolutely flat. I spent some time trying to model a baseplate for my camera that I wanted a glove like fit on. In the end I had to iterate a ton. I suspect this was due to

The camera base had a 1mm or so fillet around the edges and the scanner has a very narrow focal plane. This made it hard to precisely place the spline
I was probably a bit too obsessive about the tight fit initially and would have been better off starting with a looser one

Good luck!

this post was submitted on 02 Jan 2025

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