HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 272)

272
8.3 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
POCKET MILLING (Cycle 4)
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 cutter begins milling in the positive axis direction of the longer
side (on square pockets, always starting in the positive Y direction)
and then roughs out the pocket from the inside out.
3 This process (1 to 2) 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
DR+
40
80
55
35
15
100 60 20
DR–
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.
The following prerequisite applies for the 2nd side length:
2nd side length greater than [(2 x rounding radius) +
stepover factor k].
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!