themadpatter

Does anyone know if this information is available? It seems to me like class 15 look like they hold more, but I've never measured it. Oh! I could weigh empty and full ones, and compare the weight of thread they hold. If no one knows where this info is, I'll try this.

quiltedsunshine

Yes, a 15 class bobbin will hold more than a standard rotary bobbin, featherweight bobbin, 66 class bobbin. But I think a White Rotary will hold more, and a Bernina 7 Series machine will hold 75% more than the 15 class bobbin. M class bobbins hold about the same as a Bernina 7 Series bobbin. Don't have any charts with measurements, but I'm a sewing machine tech, and work with all kinds of bobbins.

Just a reminder...only use the bobbins that were intended for your machine.

petthefabric

The length of thread in each bobbin also depends upon the weight of the thread

Rhonda K

It depends on if the bobbin is pre-wound or self wound according to this link.

https://www.superiorthreads.com/educ...obbin-capacity

I use pre-wound bobbins all the time for regular piecing. There is a lot of thread on them. Totally worth my time to use these. Yes, I also wind about 5 or 6 bobbins at a time when I feel like it. Lazy stitcher!

bearisgray

Another link to which bobbin to use in which machine is in this thread:

https://www.quiltingboard.com/links-...n-t266129.html

Aurora

It seems to me that my Viking 6430 bobbins hold more than some of my other bobbins.

Onebyone

I'm a fan of prewounds too. I take the cardboard sides off before using. The bobbins are wound so precise and even and I rarely have bobbin thread issues.

caspharm

I agree. I have started using the prewound Superior bobbins in my Janome and love them. I have been using the Magna-Glides for my LA.

Peckish

I agree, I think the size/weight of the thread is actually a bigger variable than the bobbin itself. I've used Bottom Line (60 wt) for several years and just recently bought a cone of MicroQuilter, which is 100 wt. I wound a bobbin full and it took forever to fill, quite a bit longer than it takes me to wind a bobbin with Bottom Line.

themadpatter

See, now, I knew some one here would know this info. And of course, the type of thread would make a difference, that's why I said, "Comparatively."

The reason I was thinking about this is that if one had 2 different machines to use for, say, FMQ, the type of bobbin, and therefore the amount of thread it holds, could be a deciding factor. So, I will try one of my 15 class bobbin machines instead of one that uses the 66 class bobbins. That way, I won't have to run out of bobbin thread as much. Its too bad that new Lydia uses 66's.