Screw press

It works by using a coarse screw to convert the rotation of the handle or drive-wheel into a small downward movement of greater force.

The weights helps to maintain the momentum and thrust of the tool to make it easier to operate.

[1] A press for metalworking is a machine tool used to shape or cut metal by deforming it with a die.

The wheel can either be cranked by hand or driven by a motor using a friction coupling.

A fly press which is operated by hand is the simplest of all presses, it consists of mass, handle, body, arm, screw, ram, stop collar, treads, and guides.