screw

screw

screw is something a matter that we we need to assemble the machine . if we don't have screw we couldn't assemblethe iron piece with another in a machine :and then we can't make a good machine,tide,strong,and savety.

a screw is one of the six simple machine.a simple screw is a helical inclined.a screw can convert a rotational force {torque} to a linear force and vice versa. more threading increases the mechanical advantage .a rough comparison of mechanical advantage.a rough comparison of mechanical advantage can be done by taking the circumference of the shaft of the screw and divide by the distance between the threads.