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n/a
deleted
78 Posts |
 Posted - 10/03/2006 : 21:14:23
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Ok, I was thinking...
The way a real coin comparitor (for a vending machine) works is that it rolls coins down a ramp, past a magnet, and uses an optical sensor to see how fast they're going.
A magnet will slow down even a non-magnetic metal by creating eddy currents in it. A classic physics demonstration is to take a copper or aluminium (or some other non-magnetic) pipe, and drop a strong magnet down it. The magnet slowly clangs down the pipe and falls out the end, taking much longer than it should. This is because the magnet creates a current in the pipe, which creates the opposite magnetic field, slowing it down.
Anyway, here's my idea:
Take a fairly long ramp (maybe 3 feet or so), sloped down so a coin can roll and get going fairly fast.
Put some big beefy magnets along it near the end (only one side is OK, if they're on both sides they may squish the ramp). Rare earth magnets would probably be best, but they're expensive. 5 or 10 cheap ceramic magnets would probly work just as well.
So, roll the coins down the ramp, making sure not to give them a "push" or anything, so they're all going the same speed. Then, put two boxes at the end of the ramp, so that the coins going more slowly would fall into one, and the ones going faster would shoot over into the other one. This should theoretically be able to sort coins at a huge rate of speed, hundreds per second, if you can drop them onto the ramp fast enough, and make sure they don't touch eachother.
Even if they have exactly the same magnetic characteristics, the weight differance should affect them. The farther they fall after leaving the ramp, the farther seperated they should be, since they have more time to fall, and one is moving in the X-direction faster than the other one.
It would take some experimentation, but someone should be able to check if it works in a few minutes with minimal materials.
One of those cheap sorting banks they sell for kids should be able to drop the coins from a hopper into the ramp one at a time...
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Edited by - n/a on 10/03/2006 21:30:06 |
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n/a
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42 Posts |
Posted - 10/03/2006 : 23:03:23
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Give it a shot. In theory it sounds good but coins go through a lot of ware and rolling drag is going to come into play.
Now on the comparitor part. I'm holding one now, a CC16 . This one uses a sensor to compare a density signature of a sample coin. When the falling coin goes through another senor and it doesn't equal the sample a small relay move a guide over and redirects the coin into another slot. When I saw it in action it could do many at blinding speed.
I didn't notice an optical sensor, but then I did think to look because the input and output slots are only two inches apart.
I had to may project going to finish my sorter. I to am looking for a change sorter for the feeder, But wallmart is out. Goodwill is next.
Anyone do the 3 piece gold set(s) from the mint. WooHoo, what a killing, up %90 in two weeks. Copper is nice but quick money on limited supply is better.
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CajunCoin
Penny Sorter Member
USA
26 Posts |
Posted - 03/16/2007 : 20:11:39
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Made something with drink can aluminum and a counter balance that will tell the difference between ZINCOLN and MR. LINCOLN with a minumim problems. A small rolling coin scale in the works and it tells the diference every time! If its copper, it weighs too much and if its a zincoln, it drops down the chute!
CajunCoin
Real Money Rings True. |
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just carl
Penny Hoarding Member
USA
601 Posts |
Posted - 03/21/2007 : 09:53:46
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I'm lazy. I take coins to a bank and let them count them, put them in a saving acount, acquire interest, pay taxes on the interest, start collecting coins all over again.
Carl |
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n/a
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1 Posts |
Posted - 03/26/2007 : 20:38:25
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| I'd like to see this machine. |
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home-made coin sorter...
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