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Kitcarlson

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Reply with quote  #1 
I recently found need for a couple bobbin winder return springs found on Singer potted motors. Normally I would just order. I had spring stock 0.038", original 0.039", and decided to try. The spring has 3 1/2 turns OD 0.5'
" , with a 1" leg, and short 3/16 tail. The coil ID is about 0.43". When winding coils on rod, coils expand when released, rod needs to be smaller. I guessed at using a 5/16" diameter rod. Rod has cross, start hole. A guide tube was fabricated to hold wire in the bending process. Instead of using lathe power, I turned by hand since only a few turns were required. Guide to rod gap, is wire diameter. I started with a 20" wire, so there would be enough for two springs.

The final bends for leg and tail completed with smooth face pliers.

Here is a YouTube for similar winding process.

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Dave in middle TN

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pgf

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Reply with quote  #2 
Thanks for sharing that.  
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My machines: http://projects.foxharp.net/sewing_machines/by-age
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hwp

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Reply with quote  #3 
For those of us without lathes (ah, how I wish), here's another method.



I wish he were wearing gloves.  You SHOULD if you try this!

Be really careful with piano wire.  That stuff doesn't fool around.

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Kitcarlson

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Reply with quote  #4 
If you have a drill press with vise that will work.

Without that, with wire cutter, file , round nose pliers, a couple smooth flat pliers, just hand bend it all.

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Dave in middle TN
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pgf

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Reply with quote  #5 
Where can one commonly find spring wire? 
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hwp

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Reply with quote  #6 
A good local hardware store will usually have a few sizes or check on line if you need a broader assortment.

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SteveH-VSS

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Reply with quote  #7 
I have made hundreds of thousands of wire rings (chainmail) and this is the tool I use for making the coils that we cut apart.

This is not mine, but is made the same way.  Simple bent crank with 2x4" frame
[image]

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WI Lori

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Reply with quote  #8 
Thanks for sharing. This is a great skill to learn.
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Lori in Wisconsin
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Kitcarlson

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Reply with quote  #9 
Hobby Lobby and local hobby shop has straight spring wire. It is used for landing gear on model planes. Piano wire might be found at music supply stores, or ordered. Mc Master Carr has music wire.
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Dave in middle TN
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