Contour Milling (Cycle 16) - HEIDENHAIN TNC 370 User Manual

8 Cycles
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8.5 SL Cycles
CONTOUR MILLING (Cycle 16)
4 Program a positictning blrxk -IOF the starting point in the tool axis
(setup
cfearance above
the wrJrkpiece
surQBxd.
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The algebraic sign for cycle parameter DEPTH defines the working direction.
* This cycle requires a can&r-cut and mill fish 1641).
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Cycle 16 CONTOUR MILLING is used to finish-mill the contour pocket.
This cycle can also be used generally for milling contours.
Process
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The TNC positions the tool above the first infeed point.
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The tool then penetrates at the programmed feed rate to the first
pecking depth.
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On reaching the first pecking depth, the tool mills the first contour at
the programmed feed rate and in the specified direction of rotation.
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At the infeed point, the tool is advanced to the next pecking depth.
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This process is repeated until the programmed milling depth is
reached. The remaining subcontours are milled in the same manner.
Input data
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SET-UP CLEARANCE @ (incremental value):
Distance between tool tip (starting position) and workpiece surface.
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MILLING DEPTH 0,: (incremental value):
Distance between workpiece surface and bottom of hole.
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PECKING DEPTH 0: (incremental value):
lnfeed per cut. The TNC moves in one operation to the DEPTH if:
- PECKING DEPTH and DEPTH are identical
- the PECKING DEPTH is greater than the DEPTH.
Enter a positive value.
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FEED RATE FOR PECKING:
Traversing speed of the tool during penetration.
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ROTATION CLOCKWISE: DR- ?
The following is valid for M3:
DR+: Climb milling for pocket and
island
DR-: Up-cut milling for pocket and
island
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FEED RATE F:
Traversing speed of the tool in the working plane.
)X
Fig. 8.56: Finishing allowance
Fig. 8.57: lnfeeds and distances for
CONTOUR MILLING
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TNC 370
8-51