Face milling
The end mill can be used for face milling. However, because its entering angle is 90°, the tool force is mainly radial force in addition to the main cutting force, which is easy to cause flexure and deformation of the toolbar, and also easy to cause vibration, which affects the processing efficiency. Therefore, it is similar to thin-bottomed workpieces. Except for special reasons such as the need for small axial force or occasional reduction of tool inventory for face milling, it is not recommended to use end mills to machine flat surfaces without steps.
Sidewall face milling
Most of the workpieces suitable for end milling have one or more sidewall surfaces perpendicular to the bottom surface (this surface is parallel to the milling machine spindle), which brings about a problem that is not in face milling: sidewall shape and accuracy problems.
