8 Cycles
8.2 Drilling Cycles
UNIVERSAL DRILLING CYCLE (Cycle
203)
NW?:
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Program a positioning block for the starting point thole center) in the working plane with radius compensation RO.
* The algebtraic sign for cycle parametw DEPTH defines the working dire&an.
Process:
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The TNC positions the tool in the Z axis at rapid
traverse to the programmed setup clearance
above the workpiece surface.
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The tool drills at the programmed feed rate to
the first pecking depth.
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If chip breaking is specified, the TNC moves the
tool back by 0.2 mm. If you are working without
chip breaking, the TNC moves the tool at the
retraction feed rate back to the setup clearance,
dwells there-if this has been specified-and
then moves, again at rapid traverse, to 0.2 mm
above the first pecking depth.
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The tool subsequently drills at the programmed
feed rate by a further pecking depth.
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The TNC repeats this sequence until the pro-
grammed total hole depth is reached.
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The tool dwells at the bottom of the hole-if
Fig. 8.6: Cycle sequence: UNIVERSAL DRILLING CYCLE
this has been specified-to free run and is
withdrawn at the retraction feed rate to the
setup clearance after the dwell time. If a second
setup clearance has been programmed, the TNC
moves the tool there at FMAX.
8-l 0
TNC 370
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