Which way do you turn tension dial?
Turn the thread tension dial counterclockwise to loosen the upper thread 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.
What causes bobbin thread to bunch up?
A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.
What are the two adjustments of the sewing machine?
There are two types of tensions on a sewing machine – the upper or top tension and lower or bobbin case tension. The tension of the top thread is controlled by the tension dial. And that is usually the culprit for your sewing tension troubles.