My Brother has worked fine up till today. Took it out to work on some crushed velvet (zig-zagging) and the upper thread kept snapping in the tension wheel and the lower thread kept bunching up. Now it won't sew properly at all, straight stitch or zig-zag. The thread continues to keep on snapping, getting caught really tight in the tension wheel (although I had checked before I started sewing that it was running through fine) and the bottom stitch keeps on looping and bunching up. Have looked through my manual, but no help offered there. Please help!
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Your tension sounds too tight, try lowering it on the upper thread. Or you may be using a cheap thread which frays easily and frays in the needle. Try using a longer zigzag to see if that works. Is straight stitch smooth?
I can't find an image clear enough to actually see the stitch selection on the front of this machine.
Does it have a stitch that looks like three or 4 straight stitches, then one zig zag, then more straight stitches? This is the stitch you want to select to do a shell tuck.
Then hold your fabric with right side up and turn edge under about 8mm and seam along the edge using this stich so that the zig zag stitch goes over the folded edge each time to the right. This should pull in the folded edge a little giving a scalloped edge.
Just do a couple of trials to work out the best position for the folded edge on the needle plate to get the effect right, probably just the edge of the normal straight stitch but it varies for each machine. If your machine does this stitch with a variable adjustment on the width of the zig zag part, then you could finesse it with this too.
The loopy stitching is usually do to threading the machine with the presser foot down.
Raise the presser foot and re-thread or pull about 8" of thread through the needle and see if the loopy stitches go away.
This may also be the issue with the zig-zag stitch.
When the machine is threaded with the presser foot down, the tension is closed and the thread cannot enter as it should for the tension to control the flow of thread to the needle. The thread then feeds too fast and the stitching is distorted.
It sounds like your tensions are out of adjustment. Your upper tension should be between 3-5 and make sure the tension in your bobbin case is not too tight as well. Pull the thread through the bobbin case and make sure it comes out with a small amount of resistance. If no resistance, tighten the tension just a bit, if too much resistance, loosen it just a small bit at a time.