Screw press

A screw press is a special kind of machine press where a ram moves up and down using a screw. You can turn the screw by using a handle or a wheel. This works because the screw changes the turning motion of the handle or wheel into a small, strong push downward. Often, the handle has balls called flyweights that help keep the tool moving smoothly.

The screw press was first made and used by the Romans a long time ago, in the first century AD. They mainly used it to make wine and olive oil. Later, it was also part of Gutenberg’s printing press in the mid-1400s.

In making metal things, a screw press can shape or cut metal by pressing it with a special block called a die. It is often used to make holes in thin metal sheets all at once. When used for making books, a screw press helps keep the covers flat while the glue dries in hand book binding.

If the screw press is used to punch, it has a punch and a matching block that fits very closely. Both are carefully made and hardened. The material to be cut is placed between them, and when the machine runs, the punch cuts through the material by shearing it. The punch and block can be any shape, allowing for unusual holes or cutouts.

When used for shaping metal in a process called forging, the blocks can be many different shapes—from flat to complex designs—to mold the metal into the wanted form.

Fly press

A fly press is a kind of screw press where the screw shaft is moved by a flywheel or a pair of fly weights on a bar. You can turn the wheel by hand or use a motor with a friction coupling. The wheel is weighted so its movement keeps the shaft going. A hand-operated fly press is the simplest type of press. It includes parts like mass, handle, body, arm, screw, ram, stop collar, treads, and guides.

Improvements

A planetary roller screw can create about twice the force of a screw press using the same materials. This means it can do more work with the same parts.