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Repairing a clockwork spring with rivets

 
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I bought an old Victrola Talking Machine the other day. It turns out, one of the motor springs was broken. I believe what happened was after sitting for nearly a century, the grease siezed up and someone started cranking the handle all willy-nilly. The coils of the spring could not slide against one another and it tore apart. There was only one listed on ebay--for over 100 dollars! So fix it I will. There's nothing to lose. Here are the pieces of the offending spring.
20200711_174011.jpg
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Jordan Holland
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Cut off the jagged edges and heat with a torch to soften the temper. I want the repair area to be the most ductile area of the spring to hopefully prevent breaking in the future.
20200711_181949.jpg
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Jordan Holland
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I'm going to need some rivets. Since it is a clockwork spring, I want the rivet heads to be as flat as possible to allow the spring to contract and relax freely without the rived heads rubbing into the spring layers. Some nails will suffice. I soften the head ends with a torch to anneal them.
20200711_174526.jpg
[Thumbnail for 20200711_174526.jpg]
 
Jordan Holland
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Now drill a hole for the first rivet.
20200711_182512.jpg
[Thumbnail for 20200711_182512.jpg]
 
Jordan Holland
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The rivets, cut to a proper length, do not want to cooperate.  It is a law of nature that and item which is difficult to barely fit into a hole will always fall out at the slightest breath. I use the camming action of some locking pliers to upset the rivet a little in the holes to hold it together so I can hammer the rivet.
20200711_183844.jpg
[Thumbnail for 20200711_183844.jpg]
 
Jordan Holland
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The two halves of the spring are...well...springy and do not want to cooperate. I have to hold two springs splayed apart while I hammer the rivet. But I need something to hammer against with this awkward arrangement. This is what I came up with.
20200711_184946.jpg
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Jordan Holland
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For obvious reasons,  I couldn't take pictures of actually heading the rivets. With a ball-peen hammer, you simply use the flat face to upset the rivet to fill the holes tightly. Then you use the ball-peen to round the head and flatten it so there's no sharp edges to dig into the other coils of the spring as they slide against one another. You can see I upset the one rivet one blow too much, and it cracked the spring. The spring's steel was still more brittle than I expected, and had a definite course grain pattern to it. Not good, but I think it should hold. The strain should always be from one direction, which is good. Maybe I should have tried to squeeze in four rivets...who knows.
20200711_185025.jpg
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Jordan Holland
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Success!
 
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Very nice repair Jordan. Thank you for sharing.
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