What causes bobbin thread to bunch up?

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?

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. Next, remove all the jammed thread; this may require removing the bobbin, the throat plate, and any other parts to release any jammed threads and get the machine sewing again.

Why is my thread jamming?

The tension could be too tight or too loose. Set the tension to the basic thread tension setting or adjust the tension manually. The combination of the needle size, thread size and fabric is incorrect. Be sure to use the correct size needle and thread for the type of fabric that you are sewing.

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