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
It’s also got a wheel thingy feeding thread to make a loop.
https://cdn.theatlantic.com/assets/media/img/posts/just_in_case_you_ever_wonder_how_a_sewing_machine_works-98670.gif
https://i.pinimg.com/originals/8c/1f/e3/8c1fe3b670d08361962f07fa93c52209.gif
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