Well, thinner fabrics require more tension, and thicker ones require less tension, so that the final seam isn't too tight or loose. It hadn't occurred to me before yesterday that when sewing over a folded seam* which is thicker than the rest of the piece, that you should momentarily reduce the tension for that part. But the inner working of sewing machines is mostly a mystery to me. I've now watched a couple of nice animations of how the stitches get made, which I've always been curious about.
*Eg., each pants leg has 2 vertical seams going down. After cutting the legs shorter, when I fold the bottom edge up, and fold it again so that the raw edge is inside, those 2 folded seams have 9 layers of cloth in them.
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chiming
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Date: 2018-11-21 04:37 am (UTC)From:*Eg., each pants leg has 2 vertical seams going down. After cutting the legs shorter, when I fold the bottom edge up, and fold it again so that the raw edge is inside, those 2 folded seams have 9 layers of cloth in them.