Why do you need two threads on a sewing machine?
But with a sewing machine, the needle’s only purpose is to prick the fabric to push one thread through, so it can make a knot with a second thread before being pulled back up. The knot has become the core. … This bobbin supplies the second thread (also called lower thread).
Why can you use just one thread when sewing?
Double threading your needle will make a stronger seam, but choose single threaded if you want the stitches to be almost invisible.
What is the difference between the single thread and the double thread?
A screw thread whose lead or the distance traveled when the screw rotates once, is equal to the pitch (P) and is called a single start thread. A screw thread whose lead (L) is equal to twice the pitch is called a two start or double thread.
What does the term nap mean in sewing?
Primarily, nap is the raised (fuzzy) surface on certain kinds of cloth, such as velvet or moleskin. … When cloth, especially woollen cloth, is woven, the surface of the cloth is not smooth, and this roughness is the nap. Generally the cloth is then “sheared” to create an even surface, and the nap is thus removed.