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Caroline

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Reply with quote  #1 
I know these should both be Class 66 bobbins, but there seems to a discrepancy between them.

The bobbin on the left has a top surface that is not as rounded as the one on the right (nor is it as rounded as the five Class 66 bobbins included with some 401A accessories.)

The bobbin on the left also has a “seam” where metal was rounded to make the center “core.” The bobbin on the right shows no such seam; it appears to be a seamless tube of metal.

Should I just toss the bobbin on the left?

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1974 Singer 252 Fashion Mate;  1954 Singer 15-91;  1952 Pfaff 130-6;  1951 Singer Centennial 201-2; Bernina 230PE, and  Pfaff Serger 4874.

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penny

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Reply with quote  #2 
I've also found a bobbin that was similar to a class 66 but assume it belongs to another brand. I kept mine because I hate throw away something that could be useful. Some day I might donate it to a thrift store.
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Zorba

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Reply with quote  #3 
Do both bobbins work? There's your answer...
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Kitcarlson

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Reply with quote  #4 
I found inferior 66 bobbins have trouble fitting the drive pin on bobbin winder. My wife was given an assortment. A digital caliper was used to measure ID, OD and thickness Ok, drive pin hole off location a problem. Sometimes one side worked. Rejects were saved as tatting only bobbins.
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Jim/Steelsewing

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Reply with quote  #5 
Quote:
Originally Posted by Caroline


Should I just toss the bobbin on the left?



Absolutely not. The only right answer here is to find a nice antique 66 bobbin machine. Say a Singer 101, or 201, or a red eye 66. Maybe even a Lotus Flower treadle 66. That bobbin would work fine in any of those. That's the reason that bobbin came to you. You just haven't been open to what the cosmos is trying to say. You don't have the 'wrong' bobbin, you just don't have the right machine.

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Farmer John

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Reply with quote  #6 
I'm with Jim... A lady friend of mine bought a dozen strange needles at a thrift store, which I identified as for a Willcox & Gibbs chain stitcher.  What to do but go out and buy a W&G sm to fit the needles.
There are lots of variety in class 66 bobbins,  one hole, four hole, solid steel blackened, and plastic, to name a few.  The third one is stamped USA.
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OurWorkbench

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Reply with quote  #7 
I always thought maybe different manufacturers did it differently. I've read of new class 15 class bobbins will not work on some of the vintage machines.

I have a Pfaff 1471 and it uses bobbins that at first look, are like 66 class bobbins, however, there are some differences. I took calipers to them but don't remember what the differences are. I should have put it on the computer and maybe I could find it. I actually did a hard copy of the measurements.

Janey

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Farmer John

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Reply with quote  #8 
I have a chart of bobbin sizes...

Mfg                OD         ID            Width      Drive
66                .805       .244           .415      flange hole
Pfaff             .860       .236           .345      Notch          H bobbin
Necchi          .808       .238          .465       Notch
Singer 115   .827       .235          .358       Notch          L bobbin  also Singer 206 & 306
221 & 301    .865       .235          .296       friction

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OurWorkbench

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Reply with quote  #9 
Quote:
Originally Posted by Farmer John
I have a chart of bobbin sizes...

Mfg                OD         ID            Width      Drive
66                .805       .244           .415      flange hole
Pfaff             .860       .236           .345      Notch          H bobbin
Necchi          .808       .238          .465       Notch
Singer 115   .827       .235          .358       Notch          L bobbin  also Singer 206 & 306
221 & 301    .865       .235          .296       friction

Farmer John


Thank you, very much. Now hopefully I will be able to find on my computer.

Janey


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Farmer John

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Reply with quote  #10 
I have a bunch more dimensions if someone wants to make a spreadsheet.  The Pfaff dimensions are for the 130 & 131, perhaps more.  The Necchi dimensions are for the BU.  Also have dimensions for Elna Supermatic, National and White Family Rotary.
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seb58

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Reply with quote  #11 
Quote:
Originally Posted by OurWorkbench


I've read of new class 15 class bobbins will not work on some of the vintage machines.

Janey


That's right, the newer (and low quality) class 15 bobbins don't always work on mid-century or earlier singers: they fit just in the bobbin case but the width between the two plates (if you see what I mean) is often too narrow for the bobbin winder tongue. 

I think it is more a question of inconsistance in manufacturing than a change in the measurements of the bobbins

In my experience, same goes with class 66 bobbins, especially plastic ones: some wobble dreadfully in the bobbin case of my Singer 354 Genie / Starlet and some are fine (even from the same pack)
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