169
HEIDENHAIN 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 Cy
cle f
or Milling P
o
c
k
ets,
St
uds 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, 07:03
169
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Summary of Contents for TNC 426 B
Page 3: ...BAUSKLA PM6 30 06 2006 07 03 2 www EngineeringBooksPdf com ...
Page 4: ...BAUSKLA PM6 30 06 2006 07 03 3 www EngineeringBooksPdf com ...
Page 6: ...CINHALT PM6 30 06 2006 07 03 2 www EngineeringBooksPdf com ...
Page 16: ...CINHALT PM6 30 06 2006 07 03 12 www EngineeringBooksPdf com ...
Page 17: ...Introduction 1 Dkap1 pm6 30 06 2006 07 03 1 www EngineeringBooksPdf com ...
Page 29: ...Manual Operation and Setup 2 Dkap2_3 pm6 30 06 2006 07 03 13 www EngineeringBooksPdf com ...
Page 83: ...Programming Tools 5 Fkap5 pm6 30 06 2006 07 03 67 www EngineeringBooksPdf com ...
Page 106: ...Fkap5 pm6 30 06 2006 07 03 90 www EngineeringBooksPdf com ...
Page 107: ...Programming Programming Contours 6 Gkap6 pm6 30 06 2006 07 04 91 www EngineeringBooksPdf com ...
Page 165: ...Hkap7 pm6 30 06 2006 07 03 150 www EngineeringBooksPdf com ...
Page 166: ...Programming Cycles 8 kkap8 pm6 30 06 2006 07 03 151 www EngineeringBooksPdf com ...
Page 253: ...kkap8 pm6 30 06 2006 07 04 238 www EngineeringBooksPdf com ...
Page 265: ...LKAP9 PM6 30 06 2006 07 04 250 www EngineeringBooksPdf com ...
Page 266: ...Programming Q Parameters 10 MKAP10 PM6 30 06 2006 07 04 251 www EngineeringBooksPdf com ...
Page 297: ...MKAP10 PM6 30 06 2006 07 04 282 www EngineeringBooksPdf com ...
Page 298: ...Test Run and Program Run 11 NKAP11 PM6 30 06 2006 07 04 283 www EngineeringBooksPdf com ...
Page 312: ...MOD Functions 12 Okap12 pm6 30 06 2006 07 04 297 www EngineeringBooksPdf com ...
Page 332: ...Tables and Overviews 13 Pkap13 pm6 30 06 2006 07 04 317 www EngineeringBooksPdf com ...