7. IN–FEED MACHINING IN C–AXIS
FACE MILLING PROCESS
C–AXIS FAPT FUNCTION
(b)Cutting order viewed from a side face
TZ (Finishing allowance)
RZ (Cutting allowance)
D1 (Cutting depth)
W1 (Cutting width)
DT/2 (Cutter radius)
TX (Finishing allowance)
Side view of a face milling
The following operations are performed.
1) Portions and to be cut off are subject to the machining
explained in “Tool path viewed from an end face.”
At this time, machining cannot be performed in reverse order.
Cutting must always be executed sequentially, in the direction
toward the face milling.
2) When cutting along the Z axis is performed, the approach and
escape methods are the same.
The approach and escape points along the Z axis are determined
by subtracting the Z–axis clearance (C1) from the position of
the blank where the end face has a maximum size before the
figure is cut off by roughing.
3) When a figure is cut along the Z axis, after the final cutting in
the previous stage ends and the tool retracts in the Z axis
direction, polar coordinate interpolation is canceled. Then, the
first approach point is positioned in the next stage by means of
rapid traverse with the Z–axis coordinate unchanged, and polar
coordinate interpolation is restarted.
4) For portions and , then and , machining is performed
in the same way as shown in the tool path for portions and
5) The number of cuts along the X axis is calculated as follows:
Cutting allowance (RX)
Cutting width along the X axis (W1)
The remainder obtained from the above calculation is assumed
as the amount of the final cut along the X axis.