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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.
After you put the bobbin case in, release it, and then pull on it to make sure it is in correctly. The gathering is called a "bird's nest", and is caused by the machine not being threaded correctly. Rethread the machine top and bobbin. Then, sew a test stitch on a scrap of like material.
try changing the needle---flat side goes to the back side of the machine also check the top tension depending on the fabric your sewing on--the needle & thread have to work with the fabric--example light fabric needs a different needle & thread than a heavy fabric check to see if the thread is coming off the thread take up lever when you sew.
Is it getting tangled while you're spooling the bobbin on the top right corner of the Singer 1507 machine? If this is the case, you have to pull the thread through the top tiny hole in the bobbin, and hold on to the thread end. Then click the bobbin to the right to lock it in place, power up your machine. Keep holding the thread as you begin spooling the bobbin. Let go of the thread once the bobbin starts to spin a few rounds and the thread should not get tangled.
try this suggestions
check the needle to see if it's bent-roll it on a flat surface to see if it rolls correctly
check the bobbin to see if it's warped
check the bobbin case to see if there's any lint or loose threads
rethread the machine-upper thread & bobbin too---to make sure the thread is not catching on anything
make sure the upper thread has a thread tail 3-4 inches long
make sure the bobbin has a thread tail 3-4 inches long
make sure the bobbin is inserted correctly in the bobbin case
if you have your operation manual-check the tension settings & see if they are correct
Something is not threaded right on the top, or the thread is tangled. Take the thread completely out and rethread. Also, make sure that no thread is caught in the bobbin area, if necessary take bobbin casing out and clean with a brush. Always turn the handwheel towards you, never away from you because it can mess up the timing, Also google Singer 401a there is a great blog on this machine
I had this same problem yesterday. I took apart the needle tension casing and now it doesn't get tangled or stop. The only thing is the bobbin is not sewing...it looks fine on the top, but the bottom is just loose loops.
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