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High Speed Steel (HS): HSS is a baseline tool
steel used for many basic machining applications and for short runs on
older milling machines.
However, it does not offer the speed and feed
advantages of HSS-Cobalt and Carbide tools.
Cobalt: With a typical cobalt content of 8
percent, this tool is usually priced a bit higher than standard HSS.
allows for increased speeds and feeds because of greater hardness,
though it still falls far short of the speed, feed, and durability
advantages of carbide.
Length: Select an endmill that is as
short as possible to minimize tool deflection during the milling
operation. Select stub lengths, if possible, to save on tool cost.
Certain materials respond better to various
flute configurations. Below is a chart to help you decided what number
of flutes is best for the material you are milling.