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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
needle is in backwards
tension to tight
needle bent or blunt
thread to coarse for size of needle
needle too long for machine
burr on needle
tension discs worn so that thread works in grove
neele too fine for size of thread and fabric
lint or dirt around bobbin case holder
irregular sewing speed AND THE BIGGEST PROBLEM IS:
threads not properly pulled back under pressure foot when starting to sew
This means, Have enough of the upper and lower thread pulled to the back and hold for the first 2-3 stiches,
Do this every time and it will become second nature and you will do it automatically
hi! this particular problem is common when tension and stiches adjustment does not match and complied to fabrics your trying to sew,there a is hard way to find manual specialy to old ones. but if you want it may help you some i got here on manual sears 1803.if your control look similar to this in figure there are stitch control one for straight stitching and one
on special stitching.the small dial near needle is tension dial.You can set tension on # 3 to 5
stitch dial as in figureif you are
sewing a straight stiches set to # 8 to 12 trial are needed somtimes to acquired smooth sewing,Be sure no mechanical problem regarding in machine operation.try to sew a cotton fabric for trial then if sewing another fabrics sudden adjustment should be done.If your machine is equipted by auto tension just select on the fabrics.well small information can sometime helpfull ...nice sewing
I have a 26 year old Elna and this is the only weakness it has. Before sewing, try this. Turn the wheel manually and watch the upper thread pick up the bobbin thread. Pull both back to the left. Make sure they are plenty long. This helps me prevent the tangling in the dogfeed. My Elna has a universal tension on the bottom and I haven't ever had a problem with it unless the top tension is too tight.