HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 269)

HEIDENHAIN TNC 320 269
8.3 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
CIRCULAR POCKET (Cycle 5)
Cycles 1, 2, 3, 4, 5, 17, 18 are in a group of cycles called special cycles.
Here in the second soft-key row, select the OLD CYCLS soft key.
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 “POCKET
MILLING (Cycle 4),” page 263.
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.
X
Y
X
Z
1
2
3
Before programming, note the following
This cycle requires a center-cut end mill (ISO 1641), or pilot
drilling at the pocket center.
Pre-position over the pocket center with radius
compensation R0.
Program a positioning block for the starting point in the
spindle axis (set-up clearance above the workpiece
surface).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH = 0, the cycle will not be executed.
Use the machine parameter displayDepthErr to define
whether, if a positive depth is entered, the TNC should
output an error message (on) or not (off).
Danger of collision!