MILL TECHNICAL INFORMATION
MILL SELECTION BASICS
END MILLS have cutting
teeth on both end and side, permitting end cutting and
peripheral cutting. Center cutting types permit plunge
and traverse milling.
CUTTING EDGE: Select sharp
edged for faster speeds. Select radial edged
for longer tool life.
SHANK DIAMETER: Select
largest diameter available to maximize rigidity
and minimize axial deflection and chatter.
NUMBER OF FLUTES: Select
fewer flutes for milling softer materials at
higher speeds and feeds where more chip space is required
or when machine horsepower is limited.
Select more flutes for milling tougher materials
at reduced speeds and feeds or for increased table feeds
using the same cutting speeds.
CUTTING DIAMETER: Select
largest practical diameter to maximize rigidity, minimize
chatter and improve tool life. If machine spindle speed
is limited, the largest practical diameter permits higher
FLUTE AXIAL RELATIONSHIP:
Select straight flutes for usual general purpose.
Select right spiral flutes for improved cutting
action and easier chip removal.
Select left spiral flutes for use in absorbing
impact shock when entering steel workpiece--maintains
constant hold down pressure, and minimizes chatter.
Select high spiral (15 ° or more) to dramatically
improve cutting action, finish, chip removal and tool
life. High spirals distribute impact load more evenly
throughout the tool's entire revolution.
COATINGS are especially effective.
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