What causes bobbin thread to break?
Your Thread Tension Is Too Tight
Make sure that you are using the same weight thread in both your bobbin and upper thread. If you don’t, the tension can be uneven and cause one of your threads to break. … If your bobbin tension is too tight, it can pull your thread and break it.
How do you fix bobbin tension?
Bobbin tension or bottom tension is fixed by adjusting a small screw next to your bobbin case’s thread opening.To adjust, use a tiny screwdriver and turn the tiny screw to the right for tighter tension or the left to loosen bobbin tension.
Why does my sewing machine keep jamming underneath?
However certain you are that the problem with the machine is most likely due to a huge tangled mess of thread in the bobbin underneath the fabric, the most common reason for the jamming is usually the lack of sufficient tension in the upper thread.
How do you fix a sewing machine that keeps jamming essay?
As dramatic as it may be, jamming is a very common problem for a sewing machine. Your first step toward a remedy is to remove any fabric you were trying to sew. This may require gently tugging at the fabric and lifting it enough that you can snip at the threads and pull the fabric free of the machine.