The use of end mills—–face milling

End mills can be used for face milling. However, because the main declination angle is 90°, the force on the tool is mainly radial force in addition to the main cutting force.
It is easy to cause deflection and deformation of the tool bar, and it is also easy to cause vibration, which affects the processing efficiency.
Therefore, except for workpieces with thin bottoms requiring small axial forces or occasional face milling to reduce tool inventory
Outside of these special reasons, end mills are not recommended for machining flat surfaces without steps.

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