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What you're describing is commonly called a 'bird's nest' for fairly obvious reasons. There are, unfortunately, a number of things that can cause it.
1. Clean it! I've seen machines that haven't been properly cleaned for years. If there is lint, dust or dirt in the bobbin area especially, the looper won't work correctly and the stitch won't form. Be sure to take out the bobbin when you do this.
2. Oil it. Follow your manufacturer's instructions for this. If you don't have a book, contact Bernina and get one.
3. Change the needle and check the tensioning disks to be sure that no lint, old thread, etc. has got caught in it.
4. Adjust the tension. This can be tricky, so take it in small increments. Here, again, a manufacturer's book is a godsend.
5. If none of this avails, or it only partially fixes the problem, take it to a reputable service center (most fabric, quilting, etc. stores have or know someone) and have them adjust the timing. Most machines need this done every 1-5 years depending upon the usage.
Good luck with it. I wish I had an older Bernina, they're good machines.
try changing the needle--make sure the needle is the correct one for the fabric being sewed. also make sure the needle is turned the correct way in the needle holder and pushed all the way up into the needle holder.
Check the bobbin tension and that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder.
you have your thread tension too tight that's why it is pulling the bottom stitch all the way through it looks good from the bottom but not good on top. Its pulled the stitch all the way through the material. I had my own upholstery shop 18 yrs and tension gets you every time.Just loosen the top tension.
Sorry to say I had the same prob and finally gave up on using 2 needles and 4 threads. Other than that I love the machine but will be replacing it soon due to inability to find replacement parts as it is sooo old. :(
I believe stitch 11 is a zig zag so you are probably decreasing the length to get a satin stitch. You will get a better satin stitch if you select it directly. I think that it is about 29. The machine forms the satin stitch differently than the zig zag and it should look better. If you still get loops on top, you may need to have a qualified technician check the needle to hook clearance. If this distance is too great, the machine skips stitches and you will form loops. Several other adjustments may be needed to get a perfect stitch and a qualified Husqvarna technician should be able to take care of this problem for you.
1) It’s possible the machine is threaded incorrectly. Remove the thread completely and rethread the machine. Be sure to use good quality thread--don't buy the cheapest you can find. A good thread will help your machine perform better and your projects last longer.
2) Poor stitch quality can be caused by the needle. Make sure you're using a new needle that's right for the job. Many times machines are taken in for repairs and all they need is a new needle. Ifyou can't remember the last time you changed the needle--it's past time. Needles should be changed at least every eight hours of sewing.
3) When inserting a new needle, make sure the flat side of the needle faces away from the bobbin area. For example, if your machine has a frontloading bobbin, the flat side of the needle faces the back of the machine. If your machine has a side-loading bobbin, the flat side faces the right side of the machine. Some older sergers require special needles that don't have a flat side. Refer to your owner's manual to properly install a serger needle. 4) Thread that shreds or breaks can be blamed on the needle. Use a good thread and make sure the needle eye is large enough for the thread type. Also use the right type of needle for the fabric; 5) The machine tension adjustments put stress on the thread so it doesn't simply flow through the machine. When the upper and lower tensions are balanced, the stitch forms correctly. Tension is easy to adjust--stitch on fabric samples with a different thread colour for the upper and lower threads. Observe the stitch, adjusting the tension until the stitch is formed correctly. As a general rule, adjust the upper tension first. If the stitch still isn't right, adjust the bobbin tension.