When sewing the thread coming of the bobbin bunches up and jams the machine it even does the same thing on my digital brothers ce1100prw project runaway limited edition computerized sewing machine

SOURCE: Brother Sewing Machine model:CS8150 bobbin thread problems

The top of the machine is not threaded correctly. First raise the presserfot then rethread the machine. Bottom looping is usually caused by a lack of top tension. There could allso be a bur on the hook.

SOURCE: Bernina Bernette 65 sewing machine

Presumably neither of you has or knows how to adjust your bobbin tension so, I'm going to presume it's your hook. Make sure you are threading the machine coorectly then you'll need to remove your needle plate by removing the two screws, pull out your hook (this is the part your bobbin sits in) but make sure you note which way it sits inside your machine. Have a look at the plastic hook for any sharp edges or burs, you may need to replace your hook or try and gently sand (400grit) the plastic if possible. The key part of the hook is the small blunted point as this is what catched the loop of thread behind the needle. Please make sure that when you put your hook back in, that it is on the left side of that little guard sticking out on the lower right of your machine.

SOURCE: The machine won pick up the bobbin thread, it jams when starting

wont pick up thread from bobbin

SOURCE: Sewing machine is jamming

The UPPER thread is not threaded through the machine correctly.

Testimonial: "That was part of the solution. I also adjusted the bobbin tension, together that solved the problem. thanks for your advice! "

SOURCE: Shirring fabric?

When putting your shirring elastic on the bobbin, don't thread the elastic through the bobbin holder,adjust the stitch length longer,and loosen the tension, other wise if you want to put it through the bobbin holder you have to loosen the tension screw on the bobbin holder, and then you have to adjust it back for ordinary sewing,