Try taking the bobbin out and putting it back in the bobbin
case if it's a top loading bobbin
if it's a side or front loading bobbin make sure the bobbin case is
inserted correctly
if the bobbin and bobbin case are inserted correctly then
it sounds like the sewing machine could have a timing
problem and needs to be checked at a sewing machine shop
SOURCE: Bobbin problems
Any time you have looping on the bottom, it is almost always related to the upper tension and not anything in the bobbin area.
A good way to troubleshoot this is to turn the machine off, blow out the upper tension disk assemblies with canned air, (the machine needs to be off because most canned air uses butane as a propellant. Butane + electricity = bad;) replace your needle, and rethread your machine. Once you've threaded it to the point where you're about to put the thread through the needle, "floss" the thread forward and backward to ensure that the thread seats correctly into the tension assemblies.
Set your tension to around 4.5 for most applications, and drop your presser foot. Give the thread a gentle tug to see if the tensions have engaged the thread, then thread the needle.
If doing this does not address the problem, you probably need to have your tensions professionally calibrated. This is also true if the needle is in fact hitting something in the bobbin area. This is usually caused by the machine's timing being out of alignment, which is not something that can be fixed at home.
Good luck,
-R
SOURCE: singer 5817c
Hi, actually I can help with your problem but maybe you can help me with mine. A friend gave me the same model...without the instructions. Would you be willing to give me a pdf scan or photocopy of the manual, please? Let me know at [email protected]. Thanks!
SOURCE: On my Singer Scholastic, the thread jams in the bobbin area
It sounds like it is not threaded properly through the tension disc. Try rethreading and make sure the presser foot lever is in the up position. If it continues, once threaded and with the presser foot down, pull on the thread through the needle. If it has resistance, it is threaded properly. If it pulls easily then there is a problem in the tension area. Check to see if there are peices of thread broke off in between the tension disc.
SOURCE: singer quantum cxl sewing machine needle hitting metal
Your needle is probably to long or you need to open it more
SOURCE: threading bobbin for singer 8734
NEW MACHINE, THE NEEDLE WON'T PICK UP THE THREAD. WHAT WRONG?
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