Hiya, Husqvarna Viking Platinum 715. The underthread is loose, no matter what tension, fabric or thread quality. Further more, when asking for a zig zag, the machine throws a different thread. Help?
Lower thread tension can be adjusted by tightening (clockwise) the small screw in the bobbin case. The specifications call for 12-20 g resistance when pulling the thread slowly. I suggest tightening in increments of 1/8 turn and trying the machine each time. Also, mark the position of the screw in its original position should you need to return to the original setting and start over (use a piece of tape and place a mark where the slot in the screw is). I don't understand what you're saying about the zig zag problem.
SOURCE: bobbin tension
This is an issue of your upper thread tension, so take a look at this generic tension solution
If you are in a pickle with your bobbin case, check top tension and bobbin case are free of lint, reset the top tension to 4, and adjust the bobbin tension to suit......some more detail on how to do that, is here
Bargain Box
SOURCE: How do i set thread tension on a 306W Singer
Top tension about 4 or 5, make sure the presser foot is up when you theread the machine, make sure you can just pull the bobbin thread through with some slight resistence, if it is too tight slacken the screw on the bobbin case a quarter of a turn at a time anti clockwise.
SOURCE: Sewing thick fabric and machine won't send it through
Sergers are not really meant to sew very thick material. The blades have a maximum amount of range, or thickness that they can reach to cut. If you go outside that range, get ready for a big repair bill! You can break loopers and even the needle plate when you "push" a serger. My advise would be to use you sewing machine for the, "pounding" work. The type of material matters too, A thick Quilt like fabric can be sewn becatuse it's not dense material. A thinner harder denim could max out at 3 layers because of it"s hard finish. If the fabric you're sewing isn't dense like, you could just need new knives.
SOURCE: viking husqvarna classica 100, thread tension
I suspect you are correctly threading the machine but the timing of the needle and bobbin hook is off. When the threaded needle goes into the bobbin area, a pointed hook grabs the thread and loops it with the bobbin thread. Something is catching when the needle starts to come up that is not allowing the bobbin thread to be pulled back through the needle plate opening by the upper thread. With machine threaded and bobbin in place, have the bobbin area open if possible and watch the thread interaction when the needle goes down. To set the hook/needle timing, normally covers have to be removed. Suggest taking it to an authorized Husqvarna Viking dealer for service. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.
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,
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