The needle thread breaks
1. The needle thread is not threaded properly
2. The needle thread tension is too tight
3.the needle is bent or blunt
4. The needle is incorrectly inserted into the needle holder
5. The needle thread and the bobbin thread are not set under the presser foot when starting sewing
6. The threads were not drawn to the rear after sewing
7. The thread is either too heavy or too fine for the needle
Bobbin thread breaks
1. The bobbin thread is not threaded properly in the bobbin holder
2. Lint has collected in the bobbin holder
3. The bobbin is damaged and doesn't turn smoothly
SOURCE: buttonhole lever
If you remove the cover on the upper left portion of the machine, while looking from the left to the right.....Above the BH lever area, you will see a round cam with a post through the middle. Rotate the round can ( with fingers on it), and try again. This will change the angle position on the lever, and hopefully correct your problem. You may have to go a couple of clicks in either direction.
SOURCE: problem while sewing buttonhole with a thick thread
You will need to use a size 18 needle or even better a size 18 top stitch needle. It has a larger eye.Tighten the tension to about an 8 and try it. You may have to lengthen the stitch length to make it sew satisfactorily.. If it won't work on 8 go to 9 and if it still won't work, wrap the thread around the bobbin winder guide (on the left top of the machine) for more tension. It is very hard to sew heavy duty thread on a household machine.
sewman7
I've been looking too and I found here http://sewing.patternreview.com/cgi-bin/sewingclasses/board.pl?t=18328that you need to put the bar behind the needle threader down. I think they call it a button hole stop? I don't know, but it worked. I didn't even know it existed. But it solved my problem. On my Kenmore it looks like a black lever and you pull it down. It tells the button-holer that you are at the end of the hole and it needs to backup. nifty, kind of.
SOURCE: bobbin
Hi Sally,
Don't forget to change your needle too. It may not look bent, but it probably is.
SOURCE: i have been trying to
Firstly have you interfaced the material that you are buttonholing on? You will never get a good buttonhole otherwise. Also start each new project with a new needle matching the size to the weight of fabric. Good guide available here http://sewing.about.com/od/sewingmachineindex/ig/Sewing-Machine-Needles/
Top thread breaking is usually because the tension is too tight or the thread is catching somewhere in the thread path from the spool to the needle. Also check that the needle doesn't have a burr on it somewhere, or is blunt.
Thread snarls underneath the fabric is usually caused by top thread tension issues. You will need to rethread top and bottom and CHECK that the thread is in tension correctly. So lower the pressure foot and pull the top thread just before the needle - does it feel hard to pull? If not, then the thread is not in tension. Rethread top again, checking the tension dial is set to 5 and the thread is correctly pulled between the tension discs. And always hold the two thread tails at the back of the sewing area as you start each new seam to avoid these being pulled down into the bobbin area and getting jammed up.
So, rethread, test sew and get the top tension sorted, a nice straight stitch happening, then try the buttonholing sequence again.
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