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Re: upper thread keeps breaking
After you rethread a broken upper looper thread, make sure the needle thread is on top of the thread plate before you start to serge again.
Check to see if your differential feed is on. If it is not supposed to be on set the differential at N. Make sure the cutting blade is at the correct width setting. Check upper and lower looper tension settings. Make sure the machine is threaded properly and the threads are in the tension disks.
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Make sure the thread coming off the spool is not wrapping around the spool spindle. Install a brand new needle. Remove ALL the thread from the machine. Clean bobbin area of any dust, lint, threads. Set upper tension to the midpoint. RAISE the presser foot and then totally re-thread the machine from beginning to end verifying the sequence is correct. Test.
1. While threading put the foot up.
2. Give gentle tugs along the way. It should be without feeling any hangups.
3. Wherever the hangup is you must correct. Usually at the tension disc.
4 Sometimes the tension disc is tightening more than the indicator says. It should be about four. You can lower this tension setting until the stitch looks good.
5. You may have to take the tension assembly off and clean it thoroughly and sand any rusted spots.
My experiences with thread breaking with machine on a quilting frame make me look at the upper tension being set too high, the needle being worn or movement of the machine is too fast. Reduce the upper tension first, then sew in straight lines at first. See if you can sew slowly, in straight lines and reduce the upper tension until the thread stops breaking. If so, try some 1-2 inch circles, again going slowly. If the needle thread is pulling to the back, you will need to increase the upper tension again until the stitches meet in the middle of the fabric. If you can't locate a balanced spot where the needle thread is not pulling to the back side and thread doesn't break, try taking the machine off of the frame and sewing on a table. If it won't sew this way, it needs some professional help. If it does, you will probably save a lot of time taking it in for service, making sure to explain to the repair center that you have problems on a quilting frame, not while sewing normally. When the machine is adjusted to sew normally on a table and you move it to the frame, you will probably need to reduce the tension by 1-2 complete turns of the tension knob.
I'm not sure which thread you are referring to, its either the bobbin thread (under) or the needle thread (above.top) I'm sure you can find some helpful advise here on the baby lock site http://www.babylock.com/support/faq/?FAQ=10
I was having this very same problem with my lower looper . I had been using the one needle stitching all afternoon and I was doing quite nice stitching. then I decided to put the right needle back in and do some overlock stitching and guess what I spent the next two hours fighting the looper problem. I had completely re-thread this machine at least 20 times now. I decided to take the needle out and re-insert it and re-thread it one more time (right lower looper- then upper looper- right needle- then left needle) was careful to pull all threads to the back and under the presser foot for about 6 inches.
Held on to the thread, lowered presser foot and did the chaining stitch. BINGO it didn't break, tried it with a piece of cloth and Perfect stitches. I have a Babylock BL402 and used tension settings left to right
4-3-3-3 and default settings for the rest.
Hope this helps someone someday.
I ended up switching the spools of thread around. Apparently, even though I had purchased good quality threads, one of the spools was wound in a way that made the thread loop and twist around. So I put the offending spool of thread through one of the needles and put the needle thread on the upper looper. That seems to be working. By the way, BabyLoc was very unhelpful dealing with this problem.