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Glossary


Boring

A machining process that produces a round straight hole using a single point tool.


Chamfer

Usually a 45 degree angle machined on the start of a bore or a shaft to allow for ease of assembly.


Computer numerical control (CNC)

The control of a machine tool using coded instructions from a programmer or an operator.


Counterbore

Enlarging the end of a previously created hole.


Countersink

Creating a tapered hole on the end of an existing hole to accommodate a tapered head screw.


Drill press

A machine used to produce holes in workpieces; reaming, tapping, spot facing and countersinking can also be performed on drill presses.


Grinder

A machine that removes material from workpieces using abrasive wheels.


Heat treatment

The heating and cooling of metals to modify their mechanical properties.


Knurling

Using a tool to produce a pattern on the diameter of a workpiece in a lathe.


Lathe

A machine that holds and rotates the workpiece; a cutting tool is moved on slideways to cut cylindrical, tapered or threaded features on a workpiece.


Machinery’s handbook

A reference book used by the mechanical engineering disciplines such as engineers, toolmakers and machinists.


Mill

A machine that holds the workpiece while a rotating cutter with single or multiple cutting edges cut surfaces and contours.


Saw

A machine commonly used to cut off workpieces from bar stock using a multi-tooth blade.


Spot facing

A machining operation that creates a flat surface at 90° to a hole.


Tapping

Cutting threads within a hole using a cutting tool called a tap.


Traverse grinding

Grinding using an automatic feed.


Trepanning

Cutting a groove in the form of a circle or boring or cutting a hole by removing the center or core in one piece.