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» EM score motor cam missing teeth - ideas?

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EM score motor cam missing teeth - ideas?

By n1teowl

5 years ago

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16 posts
9 Pinsiders participating
Latest reply 5 years ago by n1teowl
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#1 5 years ago

OWL

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 5 years ago

DAV

wayout440

Pinside member

Berea, OH

11y 113K 11,264 3 12

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 5 years ago

CHS

Chuck_Sherman

Pinside member

Vancouver, WA

11y 77,050 873 12 9

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 5 years ago

MDM

Black_Knight

Vertigo

Blue Ridge, GA

9y 115K 3,065 109 33

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 5 years ago

HRG

poppapin

Pinside member

12y 135K 11,309 6 7 1

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

#6 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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!

-1

#7 5 years ago

CRP

LateCenturyMods

Pinside member

Houston, TX

8y 55,150 304

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

#8 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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 5 years ago

MEV

RacingPin

Pinside+ Frequent

Marietta, GA

11y 70,050 848 48 1

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

Mike V

#10 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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 5 years ago

MEV

RacingPin

Pinside+ Frequent

Marietta, GA

11y 70,050 848 48 1

Here’s one if you want it

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

#13 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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 5 years ago

HBO

Luzur

Pinside member

8y 53,700 1,276 5

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.

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#15 5 years ago

JDS

swinks

Swinks Pinball

12y 136K 10,561

definitely doable as a 3d printed part in solid Nylon

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

https://www.shapeways.com/product/E2ES3LJ4Z/pinball-drive-wheel-03-8476-tz-bop?optionId=55148176&li=marketplace

1 week later

#16 5 years ago

OWL

n1teowl

Pinside member

9y 61,300 544

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

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