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Screw Machine Product Terms

Acorn Die – A threading die used in screw machines whose cutting portion has a shape similar to that of an acorn.

Broaching – A machining process in which the interior and exterior surfaces of a part are altered to meet design requirements by the pushing or pulling of a cutter, called a broach, through the part surfaces. Broaching is particularly advantageous when machining complex parts.

Button Die – A tiny, adjustable die that is supported in a ring holder. Button dies are used in screw machines and for other work of the same type.

Cams – The components of a screw machine that move the slides and turret in order to feed cutting tools to the work. Cams control the automatic movements, depth and duration of every cut.

Chuck – The part of the lathe of a screw machine that grips the part to be turned, holding it in place while it is rotated and shaped.

Collet – A type of chuck on a screw machine that provides a solid grip on the turned part. A collet holds the part in place during rotation without leaving any defective marks on the part.

Cross Slide – A cam-driven slide that carries tools at right angles to the spindle. Cross slides operate through levers to give each tool the proper feed.

Lathe – A screw machine tool onto which a part is placed and rotated in order to shape it.

Mechanical Safety Clutch – A device that protects the mechanisms of a screw machine by disengaging, in order to stop the main drive shaft in the event of overloading or jamming.

Milling – A machining process that involves the shaving of a layer from the metal part.

Precision Machine Screw – A slotted, machined screw that is milled from bar stock. The thread is then cut and the screw is machine-finished.

Screw Stock – Typically, a free-machining type of alloy, in the shape of a wire or rod, that is used to form screw machine products.

Spindle – A screw machine part that consists of a rotary shaft about which a screw machine part rotates.

Turning – A machining process, used to form screw machined parts, in which a blank is rotated about a stationary piece of equipment.

Turret – A component of a screw machine that is driven by cams to bring each tool into position automatically.