coin tester
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used to resonate coins for fake detection (can be used in combination with phone app for frequency analysis to verify).
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- 5 / 5
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- 20
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- 322
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- 4
- Wyświetlenia
- 1463
- Oceny
- 4
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- Creative Commons — Attribution — Noncommercial — Share Alike
This is a clothes-pin like device to hold the center of a coin so it can be tapped with something such as a Bic pen to ring the coin to analyze whether or not the resonant frequency response matches a real coin. You can listen to the sound or leverage one of the coin pinger phone apps to do the spectrum analysis and resonant frequency correlation to known coin profiles as well.
There are two small versions (v3 and v17) at approximately 96.5mm long. Both the v3 and the small and large v17 seem to work fine even though the curves go in different directions. V3 is a little stiffer perhaps than v17. I'm not sure which I like better yet for the small version. I also scaled the v17 up to 130% in x,y, and z to accept M4 screws instead of M3 screws and posted that stl as well. I found that v17 was the best model for scaling up to the larger size so that is what I posted. I also designed some slip-on tips. I am considering printing the tips using TPU to help avoid damaging coins.
I printed out of eSun PLA+ which has more flexibility than regular PLA. If the springiness starts to go away, I found that pinching the jaws shut and running it over my propane burner for a few seconds to soften (without burning fingers) then cooling it under water restored the springiness. Be gentle.
I like the large v17 best.