I can’t get my head around how a sewing machine sews a hem on material when it just a needle with some thread poked through it stabbing the material in a line. How does that then make the thread loop back under the material to create a hem on both sides?
In: Engineering
This blew my mind when I first figured it out, because it’s so not clever. Imagine you want to see something using two threads, top and bottom. But you don’t want to cut the thread yet, you don’t want extra knits and you don’t know how much you need. So you take your two spools, use a needle to get a loop of the top down through, then you pull out a big loop, **big enough to get the entire other spool through**. Then you pull the stitches tight, and do it again.
That’s all a sewing machine does. They make you put some of the thread on a small spool (the bobbin), so the machinery can be smaller, but that’s pretty much it.
The clever bits are the timing and calibration to make the stitches neat.
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