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A milling cutter that is used mainly to machine on the side of the cutter and so used to profile a part.
End mills do not tend to have a clearance cutting edge on the end and so are not great to use in a plunge type of cutting ie like a drill.
On the left is a 2-flute slot drill and on the right a 4-flute end mill.
The end mill is used by moving the mill into the material sideways, ie at right angles to the axis of rotation.
This shows an end mill being used to machine an aluminium crankcase. The outer surface is being profiled with the end mill and a rotary table.
The depth of cut is greater than the depth of cut available for this end mill and so the machining is being done in stages.
Review - Maykestag End Mill - An exceptional end mill. These are not cheap, except if you find one on a car boot sale.
Review - Solid carbide End Mills - These are not cheap, but if you need to machine very hard materials then this is one of the options
Review - TiN End Mills - Great price and must admit that I wouldn′t buy any milling bits without the TiN coating.