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This likely is related to thread tension. You might increase that adjustment a bit higher than the book settings. If that does not fix the problem, here are some additional considerations?
First thing--change to a new needle in case it was bent when the threads got tangled. Now un-thread the machine all the way and re-thread it, making sure your thread is going through the needle in the proper direction. You have to have a top thread in order to get the machine to pick up the bottom thread.
Hmmm, could be several things.
Try a brand new needle. Try a different brand of thread.
Remove the top thread from the machine. RAISE the presser foot and rethread from the beginning. Verify the thread path is correct.
If it still will not pick up the bobbin thread, the machine could be out of time.
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
If the thread is bunching or tangling when winding a bobbin, check that you have properly threaded the winder. Especially make sure you are running the thread through the bobbin tension assembly.
try changing the needle rethread the machine top & bobbin clean under the needle plate & in the bobbin area for lint or thread make sure the bobbin is inserted correctly into the bobbin case if none of these suggestions help then it's possible that the machine is out of time & needs to be serviced
Clean out the bobbin area if there are any thread tangles there.
Refer to the maintenance section of the manual - see the configuration of the bobbin case and shuttle race? The bobbin case as an extending arm and the race a notch. When inserting the bobbin case into the shuttle, turn the handwheel so the needle is at it's highest position. Then lift the lever on the back of the bobbin case and insert the cast into the shuttle, arm pointing straight up toward the bed of the sewing machine.
Now thread the machine with the presser foot up - always - and see if the tangling stops.
When you forget to lift the presser foot before threading the machine, the tension control does not open to capture the thread. Then when you begin to sew, the top thread has no tension, and the bobbin thread, which does have tension, pulls the top thread to the bottom in messy loops.
Make sure before you close the bobbin case, that the whole piece of thread is pulled out and put towards the back of the machine, if its bunching up dont worry about it, it might just be the way the machine is. But if it is causing problems while sewing then check the bobbin thread is not tangled inside :) Hope i helped
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