169HEIDENHAIN TNC 426 B, TNC 430
POCKET MILLING (Cycle 4)
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.
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.
The following condition must be met for the second line
length:
2nd side length greater than [(2 x rounding-off radius) +
stepover factor k].
ú
Setup clearance (incremental value): Distance
between tool tip (at starting position) and workpiece
surface
ú
Milling depth (incremental value): Distance between
workpiece surface and bottom of pocket
ú
Plunging depth (incremental value):
Infeed per cut. The tool will advance to the depth in
one movement if:
■
the plunging depth equals the depth
■
the plunging depth is greater than the depth
ú
Feed rate for plunging: Traversing speed of the tool
during penetration
ú
1st side length : Pocket length, parallel to the main
axis of the working plane
ú
2nd side length : Pocket width
ú
Feed rate F: Traversing speed of the tool in the
working plane
8.3 Cycle for Milling Pockets, Studs and Slots
X
Z
Example NC blocks:
27 CYCL DEF 4.0 POCKET MILLING
28 CYCL DEF 4.1 SET UP 2
29 CYCL DEF 4.2 DEPTH -20
30 CYCL DEF 4.3 PLNGNG 5 F100
31 CYCL DEF 4.4 X80
32 CYCL DEF 4.5 Y60
33 CYCL DEF 4.6 F275 DR+ RADIUS 5
kkap8.pm6 30.06.2006, 07:03169
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