Coin mechanism


By Terry1

2 weeks ago


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    NRI2 (resized).jpg
    CM1 (resized).JPG
    FB_IMG_1504461538935.jpg
    Coin mech (resized).JPG


    #1 18 days ago

    Has anyone done any mods to their 5C coin mech to make it
    a bit more forgiving for different styles of coins?
    I am using Canadian nickles and I am getting about 50% rejection.
    I happen to have a stash of 40's and 50's nickles witch I thought
    would be neat to use!
    I don't want to modify my Bikini with a micro switch or the like;
    I would like to keep it like orig.

    Coin mech (resized).JPG

    #2 18 days ago

    If you find out why they're rejecting (speed, weight, thickness, diameter), you can then adjust that part of the mech to be a little more forgiving.

    You will need to identify, first, why they're being rejected.

    #3 18 days ago

    Are they getting stuck, or just fall through?

    If they are getting stuck, it may be they are magnetic (your Canadian quarters are). Or due to diameter (too big or too small). Or not heavy enough.

    If falling through, it's probably metal content. The bounce test at the bottom (if nickel mechs have one) is effected by what kind of metal density the coin has.

    The magnet (if the mech has one) also effects speed as the coin passes by and that can effect the bounce.

    #4 18 days ago

    It seems to reject at random!
    It may reject(coin) it once and then accept it!
    They coins are not getting stuck. They either fall through to the return
    or work.
    I have yet to find a coin that is always rejected!!!

    #5 18 days ago
    Quoted from Terry1:

    It seems to reject at random!
    It may reject(coin) it once and then accept it!
    They coins are not getting stuck. They either fall through to the return
    or work.
    I have yet to find a coin that is always rejected!!!

    You need to take it out, and repeatedly put coins in until you have some reject, and then learn why.

    The basic operation of a coin mech (mechanical, not an electronic model) is -
    - The cradle catches the coin. Too large diameter, and the coin won't be cradled properly. Too small, and the coin will fall through.
    - The cradle rotates, and sends the coin down a chute. This path has one of two magnets in it. Magnetic coins will get stuck here. The magnet *usually* is also a set width apart from the back wall of the channel - coins that are too thick will get stuck. Coins too thin will either fall off the path, OR, gain too much speed.
    - The coin then falls on an adjustable pin. Given the speed and weight, the coin will fall into the Accept path, or to the Reject path.

    Usually, if it's hit and miss, like in your case, then either-
    (1) The magnet or thickness check isn't retarding the coins enough, OR
    (2) The pin isn't adjusted properly, and valid coins aren't gaining enough speed to fall into the Accept side of the pin.

    #6 18 days ago

    If a person wants to adjust the mech for coinage, you can replace or reweight the cradle. This is the swing lever found in the upper left corner that controls acceptance size of the coin, speed of drop, and activation of the credit switch. This assumes all other parts are present such as the side magnet, adjustment screws, string cutters, coin lockout coil, and the game is functioning correctly. This also means cleaning the mech and replacing lubrication on metal on metal parts for older EM mechs.

    This is not a modification, it is a standard coin operated industry function of the mechanism.

    From left to right, quarter-dime-nickel coin mechs. The cradle is also the easiest way to differentiate mechs without markings.

    FB_IMG_1504461538935.jpg

    #7 18 days ago
    Quoted from Terry1:

    It seems to reject at random!
    It may reject(coin) it once and then accept it!
    They coins are not getting stuck. They either fall through to the return
    or work.
    I have yet to find a coin that is always rejected!!!

    Are you testing the acceptor in the game? Is there a coin rejector lock out solinoid? Have you tried testing the acceptor out of the door? Also, if possible please post a picture of the back side of the acceptor.

    #8 18 days ago

    Keeping in mind that this is a 1961 EM bingo.
    Here is a couple of pics of the under side of the mech.
    It is hard to get a picture without glare!
    I have tried to find a common denominator with the rejected
    coins with the mech removed.
    I do not see any electrical stuff except for a coil, which I believe
    stops the pin from adding a replay with a coin when there is games
    remaining.

    CM1 (resized).JPG

    #9 18 days ago

    You could use an any coin mech. accepts any coin

    #10 18 days ago
    Quoted from Terry1:

    Keeping in mind that this is a 1961 EM bingo.
    Here is a couple of pics of the under side of the mech.
    It is hard to get a picture without glare!
    I have tried to find a common denominator with the rejected
    coins with the mech removed.
    I do not see any electrical stuff except for a coil, which I believe
    stops the pin from adding a replay with a coin when there is games
    remaining.

    This mech is a lot older than the ones I've worked on, but it still has a lot of similarities to current ones.
    one thing I'd look at is the piece held in by the screw that I've highlighted:

    NRI2 (resized).jpg
    If it is like modern coin acceptors, it can be moved left or right by loosening the screw. Sometimes after lots of coins have hit that piece it can be moved slightly out of place.
    First, mark the area around that tab with a pen so you know where it was originally.
    Try loosening the screw, and see if it does move, then just slightly move it to the left, tighten it down and test it again.

    #11 18 days ago

    The item you highlighted appears to be a "string cutter". It's an add on part that should not effect the coin in it's travels. It is only there to snag a thread or fishing line if they are stringing coins.

    That older nickel mech appears to have a fixed bounce test (lower "kicker" not there) and therefore the magnet gate may be the only item to effect coin speed.

    #12 18 days ago
    Quoted from CactusJack:

    The item you highlighted appears to be a "string cutter". It's an add on part that should not effect the coin in it's travels. It is only there to snag a thread or fishing line if they are stringing coins.
    That older nickel mech appears to have a fixed bounce test (lower "kicker" not there) and therefore the magnet gate may be the only item to effect coin speed.

    Agreed - I don't see an adjustable bounce piece on that mech.

    @op can try adjusting the screw above the magnet, visible in the first pic - but be very careful. Mark where it currently is, and make VERY small adjustments. (Start with tightening the screw - making the gap larger to give the nickle more speed.

    #13 17 days ago

    Thank you for the input.
    I loosened the screw, at the top of my mech, the first pic, I am not sure what
    it does or doesn't do but it/the mech is accepting about 80 - 90 % of coins.
    I actually removed the screw, but the "thing" that it attaches to seems to rock in
    place, anyway, I tightened it back up.

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