The upper thread tension could be set too tight. Set the tension to the best thread tension setting or less. Make sure the spool of thread is installed correctly using the correct size spool cap for the size of spool. Check that the bobbin is wound so that it about 80% full and that the thread is evenly wound.Furthermore, why does my top thread keep snapping?
The most common reason why thread shreds, frays, or breaks at the needle is because the eye is too small to accommodate the thread, causing stress and friction, which results in shredding or breaking the top thread.
Also, why does my needle keep breaking on my sewing machine? Your Sewing Machine Is Threaded Incorrectly If your thread does not line up through the tension and thread guides properly, it can tighten up as you sew. This can pull on the eye of the needle and cause it to break. A poorly threaded sewing machine is one of the most common reason for breaking a needle.
Subsequently, one may also ask, why is my thread breaking on my Singer sewing machine?
If Upper Thread Is Breaking Be sure that the machine is correctly threaded and there are not obstructions (for example, thread getting caught behind the spool cap or a “rough spot” on the spool itself). Check also that the upper thread tension control is set correctly (consult your machine manual).
How do you adjust the bobbin tension on a sewing machine?
To adjust the tension, turn the large screw in short, quarter-turn increments. To loosen the tension, turn to the left (counter-clockwise). To tighten the tension, turn to the right (clockwise). If you think of the screw like a face of a clock, you should be turning the screw no more than 10-15 minutes.
Why is my sewing machine not picking up the bobbin thread?
Machine will not pick up bobbin thread. - Your thread could be caught on something between the needle and your spool of thread if so, your thread will be too tight for the needle to pick up the bobbin thread. - Make sure that the upper thread is threaded properly. - Re-thread your machine, if necessary.What tension should I use for cotton?
Cotton requires a moderate tension setting, usually between three and four. Always start adjusting your tension settings with your upper tension.What should the tension be on a Brother sewing machine?
Correct thread tensionThe upper thread and the bobbin thread should cross near the center of the fabric. Only the upper thread should be visible from the right side of the fabric, and only the bobbin thread should be visible from the wrong side of the fabric.Why does my sewing machine not stitch?
Machine is skipping stitchesFirst, check that your needle is installed correctly, not bent or otherwise damaged, and that you're using the right type of needle for your project. If the top thread is not reaching the bobbin, the threads will not lock properly, resulting in a skipped stitch.What causes birds nests in sewing?
Bird nests occur when thread bunches up underneath the needle plate, causing broken threads, skipped stitches, and uneven tension. This is typically caused by the tension balance being out of whack or the top thread is not threaded correctly.What tension should I use when sewing jeans?
Regular thread, top thread view. Tension is ideal up to 6, but is too high after that and pulls the top stitch into a flat line. Regular thread, bobbin thread view. The bobbin stitches clear up around 6 but don't improve much after that.How do you adjust the bobbin tension on a Brother sewing machine?
To adjust your bobbin thread to the correct tension, there's a bit of trial and error to be done. First, thread your machine with a thread of normal thickness. Next, set your upper thread tension to 4 (the normal setting). Then, tighten your bobbin case tension screw. 
John Peck 
