Why is my thread bunching underneath?
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.
Why did my sewing machine stop working?
If your upper thread or your bobbin thread gets a knot or snags on something, this can make your sewing machine stop and jam up. … Check your bobbin case to make sure no thread or lint is blocking your hook. Clean your sewing machine frequently to get rid of any lint and thread.