Hi and welcome to Just answer.
May I know what happen to the thread when you sew? Is it tangled under the fabric or loose on top of fabric?
Please let me know,
loose on top of fabric
If loose on the top fabric your lower tension is too loose. Please try to adjust your bobbin tension CLICK HERE.
Or you can try a yoyo/drop test watch this video on how to. CLICK HERE
Hope this initial info helps,
IMPORTANT: RATING IS REQUIRED! If you are satisfied to my answer please don't forget to rate,,GOOD OR EXCELLENT rating and BONUS are greatly appreciated...
I am just following up to see how everything is going. Did my answer help?