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treadlecrazy

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I recently got a Singer 115 that came without a bobbin case. The original bobbin cases are pretty rare, so I bought a bobbin case from SewClassic that is listed to work with a Singer 115. This bobbin case would only let me sew a few inches at a time before I got a thread snarl. These cases are designed to fit the Singer 20U and other machines that take L type bobbins, but they are not quite right for the 115.

I figured out there were two problems with the bobbin case, and I was able to fix both of them.

The first problem was that thread was catching on the bobbin in two places. There were some relatively sharp corners on the bobbin in those spots.



I used a diamond file to round off the corners more, then I used 1500 grit sandpaper to smooth the surface. After that I polished it with metal polish until it was shiny again. Now the needle thread slipped smoothly around the bobbin case.



The second problem with the bobbin case was that there is nothing to prevent it from rotating. I could sew OK for a couple of minutes, but the case would eventually rotate and I'd get a thread jam.

I found some blurry, dark pictures of the original Singer 115 bobbin cases, and it looked like there are some sort of things sticking out on the bobbin case at about 10 o'clock and 2 o'clock. I used JB Weld to glue two small bits of metal onto my bobbin case to create stoppers to prevent it from rotating. These sit on either side of a stationary piece on the sewing machine.



She's sewing beautifully now!



You can check out my blog post or Flicker album if you want to see more of this sewing machine.

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Leila
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davevv

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Cool!  I love it when things come together like that.
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David

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Reply with quote  #3 
Nice mod Leila.
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David
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Farmer John

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Good job, Leila.  I have a 115 in my sewing room, so I had to study the bobbin case.  Here are some not so blurry photos.  The bobbin case has two diameters  The larger diameter of the bobbin case that forms the stops is .935" diameter, which goes all the way around the case, except where it is machined away to form the stops.  The smaller diameter of the BC measures .880 ", so those stop steps are only .028" high each.
John
100_0134.JPG 100_0135.JPG 

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treadlecrazy

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Quote:
Originally Posted by Farmer John
Good job, Leila.  I have a 115 in my sewing room, so I had to study the bobbin case.  Here are some not so blurry photos.  The bobbin case has two diameters  The larger diameter of the bobbin case that forms the stops is .935" diameter, which goes all the way around the case, except where it is machined away to form the stops.  The smaller diameter of the BC measures .880 ", so those stop steps are only .028" high each.
John


Thanks for the pictures. The outer diameter of my bobbin case is about the same as your smaller diameter. There is room for the tabs to be thicker (mine are about .04" high). The critical dimension looks like it is keeping them at least 0.2" away from the inside edge of the bobbin case so the bobbin case can be inserted completely.

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Jessi

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Reply with quote  #6 
Really clever mod!

I love your blog about this machine! I wish I had read it earlier tonight, since I just ordered the bobbins from Sew Classic for my 115. I hope they fit on mine. I really don't want to have to file the winder down if I can help it.
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treadlecrazy

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Reply with quote  #7 
My stop latch was not perfectly straight, so that might have been the most of the reason it would not fit into the bobbins. There's a good chance these bobbins will fit on another machine's bobbin winder. I decided filing down the edges of the stop latch was safer than trying to bend it straight.
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Jennifer23

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Reply with quote  #8 
Thanks so much for posting this! I have a 115 that came without a bobbin case, and was having the same problem of the thread catching on the replacement. I will have to try filing it down next week.
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