HEIDENHAIN TNC 310 (286 140) - Manual (Page 126)

8 Programming: Cycles 114
ú Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
ú 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
ú Center in 1st axis Q216 (absolute value): Center of the
stud in the main axis of the working plane
ú Center in 2nd axis Q217 (absolute value): Center of the
stud in the secondary axis of the working plane
ú First side length Q218 (incremental value): Stud
length, parallel to the main axis of the working plane
ú Second side length Q219 (incremental value): Stud
length, parallel to the secondary axis of the working
plane
ú Corner radius Q220: Radius of the stud corner
ú Allowance in 1st axis Q221 (incremental value):
Allowance in the main axis of the working plane
referenced to the length of the stud. This value is only
required by the TNC for calculating the preparatory
position.
CIRCULAR POCKET MILLING (Cycle 5)
1 The tool penetrates the workpiece at the starting position (pocket
center) and advances to the first plunging depth.
2 The tool subsequently follows a spiral path at the feed rate F —
see figure at right. For calculating the stepover factor k, see Cycle
4 POCKET MILLING.
3 This process is repeated until the depth is reached.
4 At the end of the cycle, the TNC retracts the tool to the starting
position.
Before programming, note the following:
Program a positioning block for the starting point (pocket
center) in the working plane with RADIUS
COMPENSATION R0.
Program a positioning block for the starting point in the
tool axis (set-up clearance above the workpiece surface).
The algebraic sign for the depth parameter determines
the working direction.
This cycle requires a center-cut end mill (ISO 1641), or
pilot drilling at the pocket center.
X
Y
Q219
Q218
Q217
Q216
Q207
Q221
Q220
8.3 Cy
cle f
or Milling P
o
c
k
ets,
St
uds and Slots
X
Y