(Topic ID: 170910)

Flipper coil - What is the purpose of the tape?

By Gorgonzola

5 years ago

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  • 10 posts
  • 5 Pinsiders participating
  • Latest reply 5 years ago by Ballypinball
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    #1 5 years ago

    What is the purpose of the small narrow piece of tape that sits beneath the diodes on a flipper coil?

    To provide context, I'm working on my first restoration (HS2) and noticed when cleaning all of the flipper coils that this piece of tape is very dirty, and lifting. I'd like to clean this up or replace it if required/possible so that it is clean like everything else.

    However, I'm having trouble understanding what its purpose is. On all of the coils I've looked at, the leg with both thick and thin windings, and also the leg with just the thick winding are covered by the tape. The leg with just the thin winding is above the tape. Is it to protect from an accidental short, or heat, or something else altogether?

    #2 5 years ago

    From what your describing it sounds like an after thought on a operators part to help keep the wires from breaking off the coil lugs. Usually there is a small piece of rubber like material about a inch long that covers that area. Some people apply heat shrink tubing. Can you post a picture?

    John P. Dayhuff
    Battle Creek, MI.

    #3 5 years ago

    Used to keep tension on the wires prior to soldering to the terminals during manufacture

    #4 5 years ago

    We are winding flipper coils right now as it happens.

    That narrow piece of tape is to help prevent the small winding from shorting to the larger winding. It provides some mechanical separation between the two windings. It isn't strictly required but I believe coils that have it have had a little additional thought put into their construction.

    *EDIT* and as Ballypinball suggests above it also helps keep the windings in order so the coils can be handled freely prior to the wires being attached to the lugs.

    #5 5 years ago

    It prevents you from getting 48 VDC in your fingers when adjusting the flipper mechanism. Not lethal, but never very pleasant.


    #6 5 years ago

    Thanks for the replies. I hadn't considered the manufacturing angle, but it makes sense. I suppose the main area at risk is the thick winding where it exits towards the centre leg. It'd be possible for the insulation to be damaged while the thin wire is wound, causing a short.

    I've attached a photo just in case anyone stumbles across this thread and isn't sure what I was referring to.

    Would you just peel it off and throw it away in this case (and verify there is no short before reinstalling the coil)? Or would you try to slide some new tape in there? The third option is obviously to just leave it as is. Once I've cleaned everything else though, I don't think I could bring myself to do that!

    IMG_2131 (resized).jpg

    #7 5 years ago

    I would leave it

    #8 5 years ago

    Based on those pics you need a temperature controlled soldering iron

    #9 5 years ago
    Quoted from Ballypinball:

    Based on those pics you need a temperature controlled soldering iron

    I haven't performed any soldering on this coil. One of the previous owners/operators certainly needs one though!

    #10 5 years ago

    That's for sure

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