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Fused coil sleeves


jagojp

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Hey All,

 

This is not really so much a problem but I thought I'd just start the conversation for conversations sake.

 

Yesterday I pulled apart one of the flippers on my Godzilla for a rebuild. The flippers are fairly strong so I don't think it necessarily needs a rebuild. However, because this is my first machine I've never done it before and I was excited and interested to see how much difference a rebuild would make.

 

When I pulled it apart I was very surprised to find the original Sega flipper arm. Then when I went to remove the coil sleeve it was completely fused to the inside of the coil. After some research I've learnt that it means the coil could possibly have overheated at some stage in its life. The coil itself looks okay, there is no discoloration around the solder joints or anything. But I just couldn't get that sleeve out. So I've ordered some replacement coils.

 

Anyway, I was just wondering if the fact that the coil may have overheated at some point is something which could indicate other issues. I know that usually when coils overheat it is because they are locked in the on position, but my flippers have been working fine. Is there any other way they could overheat?

 

This is no emergency or anything, I'm just really curious more than anything else. And I enjoy talking about the mechanics of pinball.

 

Cheers. :D

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http://tapatalk.imageshack.com/v2/14/12/08/d8f43ef7e21f45df3f7e4a95b7e68929.jpg

 

Using a bobby pin and a nail file I got it haha.

Basically had to get in there and pry it away from thw inside of the coil

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Finished the rebuild. Seems to be working great. As expected the flipper is a lot stronger. It's also quite a bit louder.

 

The coil itself has a bit of play where it sits between the coil stop and the opposite plate (less than 1 mm). Does that matter at all? I could shim it with something so that it cant move around.

 

 

Thanks for your suggestions guys. I should have come and asked before ordering new coils haha. Oh well, now I have a spare set.

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http://tapatalk.imageshack.com/v2/14/12/08/d8f43ef7e21f45df3f7e4a95b7e68929.jpg

 

Using a bobby pin and a nail file I got it haha.

Basically had to get in there and pry it away from thw inside of the coil

 

Yepp.. i've had to resort to tricks like that on many occasions!!

My first implement of choice is usually a screwdriver and prise the sleeve out (in several pieces usually)!!

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Personally I don't like any play/movement of coils.

As toads mentioned you could use a wave washer:

http://www.pinballspareparts.com.au/hardware/washers/4705-00002-00.html and http://www.rtbb.com.au/catalog/product_info.php?products_id=3273

I am not familiar with your coils.....I am assuming they are a 1/2 inch inner diameter.

There are times when even these added there will still be some play. I find they don't give an even resistance to movement. The wave washers with more corrugations should.

An option I use is http://www.bunnings.com.au/abelflex-10-x-100mm-25m-zipped-expansion-jointing_p1060067

I used this under my polycarb sheets on my pergola to stop noise when they expand/contract from changes in the weather so I had some left over. That noise stop tape is crap and expensive.

I am not suggesting spending that amount of $$$ for something so small but it works a treat.

I use a math-o-mat to cut the outer with a scalpel and a 10mm hole punch for the inner.

Using a socket and a clamp I am able to compress the foam between the coil and brackets to tighten it up with a 'no play' result. No movement reduces the chance of a wire coming off.

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