Originally Posted by
crocee
Between the bobbin and case for a vintage 15-91 and a modern style class 15 bobbin case?
Boy crocee, don’t you ever think of any easy questions?
OK, the term “modern style of Class 15 bobbin case” can cover a whole range of bobbin cases.
To give you the Reader’s Digest answers to your question:
Straight stitch machines, be them Singer or Japanese, tend to have a narrow needle opening, and be either of the 11-o’clock or 1-o’clock style, indicating that the shuttle race notch is a little left or a little right of straight up.
Zigzag machines, usually Japanese, but others too, tend to have a wider needle opening, and be either of the 11-o’clock or 1-o’clock style, indicating that the shuttle race notch is a little left or a little right of straight up.
The zz guys need more room to allow the needle to fritter about from side to side, whether from movement of the needlebar, or movement of the lower assembly.
Class 15 bobbins can be all different shapes (holes in the sides, no holes in the sides, 1 hole in the side, 2 holes in the side... (you get the idea), but they are all of the same general size dimensions for depth, diameter, and center hole.
Now, can someone else bail me out here???????
CD in Oklahoma