Milling operations may be classified under four general headings as follows:

 

• Face milling. Machining flat surfaces which are at right angles to the axis of the cutter.

   

• Plain or slab milling. Machining flat surfaces which are parallel to the axis of the cutter.

   

• Angular milling. Machining flat surfaces which are at an inclination to the axis of the cutter.

   

• Form milling. Machining surfaces having an irregular outline.

Explanatory names, such as sawing, slotting, gear cutting, and so forth have been given to special operations.

• Routing is a term applied to milling an irregular outline while controlling the workpiece movement by hand feed.

• Grooving reamers and taps is called fluting.

• Gang milling is the term applied to an operation in which two or more milling cutters are used together on one arbor.

• Straddle milling is the term given to an operation in which two milling cutters are used to straddle the workpiece and mill both sides at the same time.

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