Do These Parts Do What I Assume?

[cleanview]

ok thank you

[cdthayer]

One thing that hasn’t been mentioned is overloading the bobbin with thread. I finally figured out that I was doing that to myself. It’s natural to try getting as much thread on the bobbin as possible to avoid running out of thread or having to load the bobbin more often. But too much thread on the bobbin can cause binding when the thread pays off of the bobbin, and can create havoc with normally balanced thread tension.

Overloaded bobbin means that the thread layers extend out past the rims of the bobbin. I’ve gotten to the point that I make sure they even stop short of being even with the rims, just to make sure the thread won’t contact the bobbin case when the bobbin turns.

I don’t know if this could be any of your problem, but if you’ve got a freshly wound bobbin in and suspect it could be contributing to the problem, simply pull a couple of feet of the bobbin thread out, cut it off, and try sewing again.

CD in Oklahoma

[shoepatcher]

cdthayer,

That is correct. Most bobbins on industrial sewing machines should be filled only about 85% of capacity. That is what I have read from a lot of manufacturers over the years. By only filling a bobbin to that amount, you are less likely to overfill the bobbin and cause any tension issues in the bobbin case.

glenn

[cleanview]

cool