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GLOSSARY OF TURNING AND GRINDING TERMINOLOGY

Machine Types

CNC Machine CNC (Computer Numerically Controlled) Machines are programmed and controlled by computer so can offer very short set up times and the flexibility to run batches from one offs to several thousand
Fixed Head Lathe A type of lathe where the headstock remains in a fixed position and the tooling moves backwards and forwards to cut in the desired position.
Multi-spindle Lathe Multi-spindle machines have up to eight spindles. Each spindle moves from tool to tool in turn. Because up to eight operations are carried out simultaneously extremely fast cycle times can be achieved.
Sliding Head Lathe A type of lathe where the headstock both rotates and moves forwards and backwards. This means that machining is carried out at the support position to give optimum cutting conditions. Such machines are particularly suited to long slender parts and large batches of small components.

Machining Operations

Boring Removal of material from the inside diameter of a workpiece. In boring the workpiece rotates and the tool is held.
Drilling Removal of material to create a circular hole in the workpiece. When drilling the workpiece is held steady and the tool rotates.
Milling Removal of material from the workpiece using a rotating tool which passes across the workpiece.
Tapping Specialist form of Turning where a screw thread is cut into the internal diameter of the workpiece.
Threading Specialist form of Turning where a screw thread is cut into the external diameter of the workpiece.
Turning Removal of material from the outside diameter of a workpiece in a lathe. Generally the workpiece is rotated and the tool is fixed. Turning ususally produces a circular section though modern lathes can produce eccentric shapes..
   

 

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