Hi
I have an AEG 11680 sewing machine. I was sewing a a zig zag pattern on some canvas bags, the needle locked and and the machine stopped. I found the needle was hitting the bobbin housing. It appears that the needle is slightly out of sync with the bobbin.
I have stripped the machine to see if anything may have caused this but found nothing obvious. I am thinking that the cogged drive belt that connects the top needle drive to the bottom bobbin drive may have jumped a tooth.
My question is has anyone had this syncronisity problem?
Also while I am here, when you do a back stitch before sewing to grip the thread how many back stitches is correct? At the moment I do about 5mm/5 stitches is just one or two ok?
Thanks