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
As others mention, it’s much easier to understand by looking at a video that shows it in action, but the key is that the machine sews with two threads: one from above the fabric and over from below, and when the needle goes under the fabric the threads are looped together.
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