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Remove all the threads.
Replace the needle.
ALWAYS RAISE the presser foot and rethread from the beginning.
Verify each thread is in the correct thread path.
ALWAYS THREAD each in the order specified or you will continue to have problems--for a lot of machines, the order is Upper Looper, Lower Looper, then needles.
Check the tension on that particular thread--too tight, it will break.
Breaking thread after about an inch usually indicates it is mis-threaded--a guide has been skipped or threaded out of order or the thread may be wrapped around something.
When threading a serger, you MUST follow this sequence.
1. Upper looper
2. Lower looper
Then thread your needles. If your thread breaks, you must un-thread your needles before re-threading your loopers.
Could be the result of several things. There could be some gunk or threads stuck in the tension disk. Be sure to remove the thread and rethread from the beginning in the order specified. ALWAYS RAISE the presser foot when threading!!!! If you haven't tried a brand new needle, do so, and make sure it is pushed all the way up and installed with the flat side facing the correct direction. Some machines recommend #90 as the largest needle to use. Also, perhaps the needle eye is too small to accommodate the thread. Watch where the thread is breaking to give you an idea of where the problem may originate. Try a different brand of thread. Sometimes black thread causes issues because the heavy dye affects the thread. Set the tensions at the midway point and then loosen the tension on that one needle. There could also be a burr or rough spot somewhere along the threadpath that is catching the thread. Last idea--could be a timing issue.
5. Is the tension adjusted to accommodate thickness of thread being used?
6. Are you using inferior quality thread?
7. Is the thread feeding of the cone/spool freely?
8. Is the needle size correct for the type of fabric being used?
9. Are the needles being used the correct one for the serger?
10.check in the needle plate area to see if there is a burr
11. Check the looper to see if there is a burr or if it looks damaged
If all of the above suggestions don't help then the serger needs to be checked to see if there is something wrong with the loopers and also see if there is a problem with the tension.
Serger thread breaks
1. Is the serger threaded correctly?
2. Is the needles inserted correctly?
3. Is one of the needles bent or damaged?
4. Is the tension adjusted too tightly?
5. Is the tension adjusted to accommodate thickness of thread being used?
6. Are you using inferior quality thread?
7. Is the thread feeding of the cone/spool freely?
8. Is the needle size correct for the type of fabric being used?
9. Are the needles being used the correct one for the serger?
Serger thread breaks
1. Is the serger threaded correctly?
2. Is the needles inserted correctly?
3. Is one of the needles bent or damaged?
4. Is the tension adjusted too tightly?
5. Is the tension adjusted to accommodate thickness of thread being used?
6. Are you using inferior quality thread?
7. Is the thread feeding of the cone/spool freely?
8. Is the needle size correct for the type of fabric being used?
9. Are the needles being used the correct one for the serger?
some times when you break a needle in a sewing machine or serger it can cause the machine to jump time, it would be a good idea to have the machine checked for a timing problem or to see if when the needle broke it caused a problem with another part in the serger.
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