What size is that bobbin?
If you have trouble understanding all the different types of bobbins, you're not alone. There are such subtle differences between many of them that's it is easy to become confused.
Most of today's embroidery machines use either a Class L or Class 15 bobbin. Many can use both. So what's the difference? Class L and Class 15 bobbins are the same diameter. The difference between the two is thickness and how much bobbin thread they can hold.
In this drawing you can see what I mean. Both bobbins are 3/4" in diameter, but the Class 15 is about 1'8" thicker, thus it holds more bobbin thread.
Most of the newer embroidery machines today are designed to use the Class 15 bobbin. Using the Class L bobbin is OK, but a center pin or spacer may be required to take up the remaining space in your bobbin case. Without this spacer the Class L bobbin may bounce around and cause problems when sewing.
Here's a tip: If you use any cardboard sided bobbins, two or three sides removed from empty spools make really good spacers.
Another term you may hear is Class M. The Class M bobbin differs greatly from the Class L bobbin. It is considerably larger, about 1/4" in diameter, and can not be used in a Class L machine.
Both the Class L and Class M bobbins are the same thickness.
For the most part Class M bobbins are used in longarm quilting machines and other large commercial embroidery machines.
There are many other less common bobbin sizes, but for the most part these are the terms you'll hear most often. Check your owners manual to be certain of the type bobbin your machine is designed to use.
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