Keeping hand pressure on the whole tension setup(so everything does go flying off all over the place, Unscrew the knob, take it off, and everything after it until you have the discs off, NOTE: place them in front of you in the order they came off and the way they came off. Clean the discs with rubbing alcohol and check them for damage. After I've cleaned mine, I put a bit of clear machine oil on my finger and rub it on the discs...NOTE: sew on scrap after this until any trace of oil on fabric is gone. Put everything back on and give it a go. Another thing to check is if the tension setup is working at all, lift your pressure foot and pull the thread, does it move easier? If it doesn't, it's another issue. I don't know how to fix the mechanical side, if that is the issue, but it may just be the threading. Unthread your machine completely, take the thread spool off its holder to make sure the thread hasn't wrapped around anything, put it back and re-thread. Hope one of these works for you, good luck!
Make sure that the thread is not getting caught on the handle. I was having the same problem and tried everything only to find that my thread was caught.
SOURCE: How do i set thread tension on a 306W Singer
Top tension about 4 or 5, make sure the presser foot is up when you theread the machine, make sure you can just pull the bobbin thread through with some slight resistence, if it is too tight slacken the screw on the bobbin case a quarter of a turn at a time anti clockwise.
SOURCE: burnette 65 bobbin tangling can't adjust thread tension
Have you replaced the needle with a new one? Your needle may be bent or in wrong, or the wrong size. You may have a bad needle. Check that the upper thread path is running freely and is not tangled or wrapped around anything. Make sure that the bobbin is unwinding in the correct direction as well, most bobbins, this is clockwise as the bobbin faces you. If you are using inexpensive thread, it could be the thread that is the culprit. Uneven thread in the needle will not flow through the needle properly, and cause bunching as well. Save it for the bobbin, and use good thread in the top.
SOURCE: thread balls up in the bobbin/singer sewing machine, also thread
The balance stitch control on this model is below the stitch patterns; to the far right.
If you need a manual you can download a free one at the Singer Company website.
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