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Old 01 October 2013, 03:15 PM
Troberg Troberg is offline
Join Date: 04 November 2005
Location: Borlänge, Sweden
Posts: 11,580

Originally Posted by snopes View Post
Comment: If you go to a vending machine and enter the code 432112311 and
immediately push the coin return and coins will fall into the tray?
I strongly doubt it. Why? Because once the purchase is done, the money are dropped into a container of some sort. Not uncommonly, this is just any box that happened to be nearby, in the case of my pinball machine, a plastic cookie box in the bottom of the machine.

There simply isn't any way for the machine to retrieve them and hand them out, once they are deposited, they are unreachable.

For machines that can return change, it's usually done with preloaded change, so that the machine won't have to sort the collected money into some kind of dispenser magazine. The money paid still goes to the "bank".

Originally Posted by hoitoider View Post
When I was a teen (1970's) I remember something like if you put a quarter halfway through the slot of a vending machine with your finger on the edge then spun it as it dropped in it would credit a purchase regardless what the price was - probably 50 cents back then. I remember it working on multiple machines but maybe 5% of the time at best. A friend of mine would stand there, spin a quarter in, not get credit, hit the change lever, try again, etc. until he got a credit or got tired of trying and put the full amount in.
Could possibly work, but I doubt it. Why?

Well, the mechanism has the coin roll through a channel which measures the size (diameter, and, sometimes, thickness) using carefully calibrated switches. Theoretically, enough backspin could make the coin roll back, then down again, counting as two extra coins.

Why do I doubt it?

Well, the channel the coin rolls down is pretty steep and shaped a bit like a flat funnel (or, if you prefer, a wedge). A spinning coin would probably either just slide down, with insufficient friction to go back up, or bounce until the spin is lost.

Examples of a coin sieve (Correct word? Just a straight translation from Swedish...). Not perfect photos, but some of the mechanism can be gleamed:
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