Screw - mechanical advantage
A screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force. It is one of the six classical simple machines. The most common form consists of a cylindrical shaft with helical grooves or ridges called threads around the outside.
The mechanical advantage MA of a screw is defined as the ratio of axial output force Fout applied by the shaft on a load to the rotational force Fin applied to the rim of the shaft to turn it.
The MA can be calculated from the shown formula.Related formulas
|MA||mechanical advantage (dimensionless)|
|η||efficiency of the screw (dimensionless)|
|r||radius of the shaft (m)|
|l||lead of the screw (m)|