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The problem most likely is not the bobbin. The problem is the top thread. If thread is knotting, tangling under the fabric, it is a top thread problem.
Remove the top thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning.
If there are still thread clumps under the fabric, you will need to increase the top tension. (The extra thread appearing under the fabric is excess top thread hanging up under the fabric.) You may need to keep adjusting the top tension until both top & bobbin threads meet in the middle of the fabric.
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.
1)Check that your bobbin does not have a nick in it where the thread can catch and won't feed smoothly.2) make sure the upper and bobbin threads are the same.3) pull out the bobbin case and chect to see if there is a clump of lint.4) make sure the feed dogs are moving the fabric through smoothly,some fabrics can get caught on the dogs and make the bottom thread get loopy.5) check your needle,if it's bent or has a bad tip,it can mess up the stitch.
Are you using a large needle, size 110 probably would be required. However, this does sound like a tension issue, although it is appearing on the bottom, its probably your top tension device that is causing it, check tension is set to 4 or 5, and that your top thread is threaded into all the eyelets correctly.
Clean your top tension device if you can get to it, these do gunk up with dye particles and dust with time and this can affect performance. To clean, turn dial to zero and "floss" between the metal tension discs with selvage edge of a clean piece of waste cotton fabric, if some black stuff comes out, keep cleaning. Set tension back to normal setting when done.
Also, I am assuming that you are using a good quality thread, polyster, or a cotton wrapped polyester. Gutterman, Sylko, Mettler, Metrosene are all good.
Ensure that the needle is installed correctly. If the needle moves down in the needle socket (only a little bit) it causes these clumps. Loosen the needle securing screw - push the needle up as far as it will go and tighten the screw again. Try again.
looping the material ( bird nesting) is an indication of incorrect needle thread tension before threading the needle pull the thread and there should be resistance to the pulling
Hi: You have threaded the machine incorrectly. Rethread the machine with the presser foot up to the needle, pull the thread (loose) and drop the presser foot while pulling thread, thread should get tighter, then thread needle and machine will work fine. Make sure the top tension is set at where you normally have it, probably about #4 or #5
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