Sounds a lot like sewing to me. The tension can be loosen or tightened.
a needle does is a machine
holds the needle
holds the needle
The motion of the needle in a sewing machine is vertically, rapidly up and down.
Wedge
motion of the needle of a sewing machine is what is the motino is this?
The needle bar is a component of a sewing machine that holds the needle in place and controls its up and down movement. It is connected to the machine's mechanism that creates the stitch by moving the needle in synchronization with the fabric being sewn.
The screw that tightens to hold the needle in place, and loosens when you want to change the needle.
NEEDLE
Wedge
zigzag machine
The machine that has a needle that goes from side to side is an overlock serger. It is used to prevent fabric from fraying.