How vending machines sort out fake coins - GIF

[Altair]

How vending machines detect and sort out fake coins.




Previously:

1950s whisky vending machine - photo
Stacked coin separating trays - GIF
How to make a coin ring - GIF
Making a coin ring - GIF
Folding coin knife - GIF

[owen moore]

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.

[hemmjo]

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