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Re: Problem with Bernina 630
Sounds like one of your thread sensors is misaligned, covered in lint or broken, get a can of canned air and clean out your bobbin case area and you top tension area to ensure no lint/thread is blocking the sensors. If you still are having problems, find your local independent sewing store in your town that gives free estimates and see what they say.
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Berninas can use double or triple needles, just be sure the needle is set in the center position and the stitch width is set to zero. If your machine does not have dual spool pins, you can put one spool in a drinking glass on the table behind the sewing machine. You can also probably fashion a spool holder out of a small dowel on a base or even find a standalone spool holder. Instead of using two thread spools, some people will use a thread spool and load thread on a bobbin and put both on the spool pin.
Be sure to thread each separately so the two threads do not become twisted. Your machine may also have dual tension disks, so each thread should be separated when going through the tension unit.
Have you tried re-threading the top thread? Sometimes the stitches get small and pull tightly because the thread is looped around a guide or the thread spool. Just a thought as that happens frequently with my machine.
It may be that the upper thread sensor flag has come off the check spring at the bottom of the takeup arm cover - unfortunately this is not user-fixable and needs Bernina agent action. This happens frequently with people who, when finishing with a spool of thread, pull the thread backwards out of the machine - you should never do this. You can turn the sensor off by going into the menu that has an arrow with a box around it, but this is only a temporary fix and you should have the machine looked at.
You need to take your machine in for service. The 8 series machines have new upper tension parts that can be installed under manufacturer warranty and MAKE SURE your Bernina dealer is well trained on the 820 and 830 or they'll never get it adjusted right. The 8 series are just all around buggars when they're out of whack.
Thread the machine with the presser foot up. This opens the tension so the thread can enter. Threading with the foot down closes the tension and the thread cannot enter as it should. When you sew, the top thread is loose and cannot properly connect with the bobbin thread to form a tight stitch. The stitching does not hold and pulls right out.
Thread breakage - top thread? Check the thread spool to be sure there aren't any nicks to catch the thread.
When the thread breaks, check the spool pin to see if the thread is unwinding too fast and wrapping around the pin. Thread nets can help stop this. You can find them at sewing machine dealers.
Try threading the machine with the presser foot up and see if this helps.
When the foot is down during the threading, the thread does not enter the tension control as it should, then when you start to sew, the upper thread has no tension and does not form a stitch with the bobbin thread.