How vending machines sort out fake coins - GIF

How vending machines detect and sort out fake coins.

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Previously:

https://www.homemadetools.net/forum/...565#post136151
https://www.homemadetools.net/forum/...809#post129179
https://www.homemadetools.net/forum/...960#post125012
https://www.homemadetools.net/forum/...2930#post97555
https://www.homemadetools.net/forum/...348#post101352

Back in the 60's, I worked for a vending machine company in R&D. Our coin mechanisms would check for magnetism, diameter, thickness,hardness by bouncing off of a small anvil, and finally a string cutter. There were people who would actually try to cleverly fasten a string to a coin and let it try to validate a purchase, and then pull it back out! They would do the same thing with dollar bill machines by attaching a piece of scotch tape to the bill and feed it in then pull it back out.
The machines of today are much more discriminating and secure with modern electronlcs.

It would be interesting to see what kind of stuff ends up on the reject box in that machine.