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CLASSIFYING MILLING CUTTERS

Most milling cutters are designed to perform specific
machining operations. You should learn to identify common
types by sight and know their capabilities and limitations.
Milling cutters can generally be classified as follows:
1. Material of manufacture
2. Profile-sharpened or form-relieved
3. Arbor-driven or shank types
4. Rotation and helix hand
Material of Manufacture
Many milling cutters are made from high-speed steel (HSS).
Some types have cemented carbide cutting edges. Large cutters
have inserted blades or teeth.

CLASSIFYING MILLING CUTTERS k-12
Arbor-Driven or Shank Types
Milling cutters for the horizontal mill are designed to be
driven by the mill arbor, or they may have their own tapered
shanks for direct mounting in the machine spindle socket.
Although in many instances you will use a tapered shank
mounted cutter in the horizontal mill, probably the most
common cutters you will be using are arbor-mounted types.
Milling cutters are either for right-hand rotation cutting or lefthand
rotation cutting.
The way in which a cutter is mounted
on an arbor determines the hand or cut. Counterclockwise
rotation determines right-hand cutting direction. Clockwise
rotation determines a left-hand cutting direction (Figure K-13).

CLASSIFYING MILLING CUTTERS k-13
Helix hand is determined by looking at the end of the cutter
and determining which direction the flutes twist. Flutes
twisting to the right are right-hand helix, and to the left are
left-hand helix.

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