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Original coin slots used a system of weight and thickness tests to check to see if a coin was valid.

In a vertical mechanical slot a coins initial size is tested by the slot guard which is a metal plate keyed to he vertical size of the coin. It then drops into a cradle which has a counter balance which tilts at a calculated speed dependant of the weight of the coin. After this it rolls down a guide which has a gap which is slightly smaller than the width of the coin passing a magnet on the way. The magnet will pick up iron based slugs but will also slow coins of other materials as well. Then the coin rolls off the end of the guide jumping a gap and hitting a nylon angle. The speed at which this impacts determines how far it bounces off the nylon into one of two slots. the closest slot is the reject return and the farthest the accept slot. If the coin is to light it won't bounce far enough to be accepted. Once the coin has been accepted it will pass by an anti-strimming latch which prevents the old coin on a string trick. Further to this some slots use dual micro-switches that time the decent of a coin and trip an alarm if the coin drop is too fast or slow. Finally the coin drops through a microswitch to register the coin to the CPU. There are various other designs of mechanical slot but the vertical type are the most frequently used.

On a modern electronic slot this process is more simple and more complex at the same time. On these slots weight and size are irrelevant. what is important here is metal composition. Using the principle of back EMF effect a coin is passed down a slope at a known speed determined by its mass past a number of coils. The interaction of the coin and the coil creates a voltage which is read by a ADC and compared by a microprocessor to a set of known values stored in a ROM. If the coin does not produce the correct values a signal is sent by the microprocessor to open a section of the rail and drop the coin out of the reject slot. If the coin is accepted it continues down and past a pair of opto-sensors which look for strings, nylon strimmers etc. If the second opto is tripped and the drop time between the pair is right for that coin it will be registered as accepted.

Needless to say that the electronic slot is very resistant to fraud since it not only tests the size & mass of the coin but also its metal composition as different metals produce different back EMF values. It also has the advantage of being able to accept any size or shape of coin made in any country through a quick ROM change.

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How does a vending machine know the difference between a dollar bill?

A vending machine uses sensors to detect the physical characteristics of a dollar bill, such as size, shape, and special security features like watermarks or magnetic ink. The machine then compares this data to a database of valid currency to determine if the bill is genuine.


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You can calculate the mechanical advantage of the machine.


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To calculate the mechanical advantage of a compound machine, you need to know the input force applied to the machine, the output force produced by the machine, and the distance over which the input and output forces are exerted. By comparing the input force to the output force, you can determine the mechanical advantage of the compound machine.


What do you need to know to calculate the efficiency of a machine?

To calculate the efficiency of a machine, you need to know the amount of useful work output produced by the machine and the amount of total energy input supplied to the machine. Efficiency is calculated by dividing the useful work output by the total energy input and multiplying by 100 to express it as a percentage.


What must you know in order yo calculate a machine's efficiency?

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Related Questions

How does a vending machine know to give change?

the machine has a calculator and can tell coins apart


How does a vending machine know what items sell the best?

it has a scanner


Where can I learn the ins and outs of having my own vending machine business?

It is important to do a great deal of research before starting any business. For a vending machine business, gumballs.com has a good starting guide for people considering vending machine routes. One might also talk to other vending machine operators to get experienced advice. If you don't know any owners, try calling the number on a vending machine to see if anyone will talk to you. Many vending machine businesses are run by individuals rather than large chains, so you might get the owner directly. Before starting a route, be sure to know how well traveled it is and by whom so that you know if you're likely to earn sufficient income from it.


I live in the philadelphia area and I need my standard change machine repaired. Where can I go, they moved to Indiana?

Didnt know if you meant vending machine change machine, cash register etc.. I assumed a standard vending change machine service. Give these folks a try. http://www.superpages.com/yellowpages/C-Vending+Machines+Service+&+Repair/S-PA/T-Philadelphia/


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It recognizes the type of cion or bill by the ink or kind of metal.


looking for used coke vending machine at out of business sale?

I cannot say specifically if I don't know where you are located.


For so random scavenger hunt where is the bink boot and last script page for beauty boot camp?

the last pink boot is on top of a black vending machine on the set with all the food in it. It is the vending machine near the exit, where there is a door leading into the chicken set. I dont know where the script page is.


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Yes. Although many opportunists would take advantage of the situation you would be stealing.


What if your drink doesn't come out of a vending machine?

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Well, honey, that vending machine ain't no mind reader. It's got a fancy little sensor that detects the coins you put in and calculates if you've overpaid. If you're due some change, it'll spit it out faster than you can say "snack time." Just don't expect it to give you a friendly wave goodbye afterwards.


How do you know a 1980 south African krugerrand 1 oz coin is real and are there fake ones?

Yes, there are most definitely fake krugerrands in circulation. The best way to verify a fake or real krugerrand is to go to a reputable coin dealer. You can also do some measurements of the coin, a real 1 oz. krugerrand will weigh 33.930g. its diameter will be 32.77mm, and its thickness will be 2.84mm.


How does a vending machine know the difference between a dollar bill?

A vending machine uses sensors to detect the physical characteristics of a dollar bill, such as size, shape, and special security features like watermarks or magnetic ink. The machine then compares this data to a database of valid currency to determine if the bill is genuine.