Slot Milling (Cycle 3) - HEIDENHAIN TNC 370 User Manual

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Finishing process:
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8 Cycles
8.3 Cycles for Milling Pockets, Studs and Slots
SLOT MILLING (Cycle 3)
Process
Roughing process:
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The tool penetrates the workpiece from the
starting position and mills in the longitudinal
direction of the slot.
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After downfeed at the end of the slot, milling is
performed in the opposite direction.
These steps are repeated until the programmed
milling depth is reached.
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The control advances the tool in a quarter circle
at the bottom of the slot by the remaining
finishing cut. The tool subsequently climb mills
the contour (with M3).
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At the end of the cycle, the tool is retracted at
rapid traverse to the setup clearance.
If the number of infeeds was odd, the tool
returns to the starting position at the level of the
setup clearance.
Fig. 8.27: SLOT MILLING cycle
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 @I: (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:
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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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FIRST SIDE LENGTH @l :
Length of the slot, parallel to the first main axis of the working plane.
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SECOND SIDE LENGTH @ :
Width of the slot.
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FEED RATE F:
Traversing speed of the tool in the working plane.
Fig. 8.28: lnfeeds and distances for the
SLOT MILLING cycle
Fig. 8.29: Side lengths of the slot
TNC 370
8-27