(Topic ID: 228622)

EM score motor cam missing teeth - ideas?

By n1teowl

1 year ago

Topic Stats

  • 16 posts
  • 9 Pinsiders participating
  • Latest reply 1 year ago by n1teowl
  • No one calls this topic a favorite


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    #1 1 year ago

    I've got a Williams EM that was not scoring right. The 3000 point switch was scoring 2000 and the 5000 point switch was scoring 4000. It turns out that two of the teeth (one on each side) of the impulse score motor cam were broken off. I'd prefer to replace the cam, but I know I will have a hard time finding one. Any ideas for a fix? Should I try to melt something on? I also thought about drilling a hole below and looping some stiff wire around. What's the best approach?

    Score motor cam (resized).jpg
    #2 1 year ago

    No patches will reliably solve this. The best option would be to replace the part. If one can't be found, perhaps a replacement can be fabricated.

    #3 1 year ago

    As Em`s get older, this is something that there might a market for, I thought I had a bunch of G10 around but I think they got tossed.

    I would try to drill the center of the nub with a 1/32nd bit, after filing it flat first, (leave as much material as you can tho), find a small piece of G10 fiberglass or similar, drill the same thru the piece, insert a piece of wire (paperclip) thru the new piece and into the wheel, using epoxy or your glue of choice, then shape to contour of original

    Have never done this, but it is what I would try first

    Good luck

    #4 1 year ago

    Sounds like a great 3D printer project.

    In the mean time, I’d put a chunk of JB weld plastic on it and file it down to form it.

    #5 1 year ago

    Look on ebay for part or buy cheap parts machine..

    #6 1 year ago

    Thanks for the ideas. I have JB Weld as well as some some fiberglass fabric. I figure it's worth a try to fix it - worst case it can be fabricated, 3d printed, or replaced. I might try a combination of drilling, adding wire and then JB weld. I'll post some pics and let you know how it goes!

    #7 1 year ago

    If the broken disc is removable I can fab a replacement. PM me if it comes to that.

    #8 1 year ago

    I used wire and JB Weld, just curing now. LateCenturyMods - thanks a ton for the offer. Fingers crossed that I won't need it.

    #9 1 year ago

    What is the tooth count and diameter? I’m pretty sure I have a replacement

    Mike V

    #10 1 year ago

    Diameter is 2 inches not including teeth. There are two sets of 5 teeth (for a total of 10), with what looks like a 1 tooth space in between.

    #11 1 year ago

    Success! I ended up drilling a small hole and threading some wire through. I twisted it tight and cut it off. I then spread some JB Weld on and let it set. After that I filed it smooth and reinstalled. Working great now, but it remains to be seen how well it lasts. Thanks for chiming in, everyone.

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    #12 1 year ago

    Here’s one if you want it

    652CE2EF-42C0-4C85-9B95-D9089A8EF34D (resized).jpeg1A98EC68-3BCD-4891-ABE4-867F8A93121D (resized).jpeg

    #13 1 year ago

    That's it! I'm sure yours will hold up much better than my hacked one. Thanks a ton for finding it. I'll PM you.

    #14 1 year ago

    I had the same problem with my Big Injun, one of the teeth was missing on the player unit in the backbox so it would always skip a beat and add 2 player game, somehow, but luckily i found the missing tooth in the bottom of the cab (right before i vacuumed it even) so i could just hard glue it back, now the game works fine again.

    IMG_20181024_140056 (resized).jpg
    #15 1 year ago

    definitely doable as a 3d printed part in solid Nylon

    I designed this for a guy and put it up at Shapeways


    1 week later
    #16 1 year ago

    Thanks RacingPin for getting me that replacement part. I appreciate it!

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