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DRILLING (Cycle 200)
1 The TNC positions the tool in the tool axis at rapid traverse FMAX
to set-up clearance above the workpiece surface.
2 The tool drills to the first plunging depth at the programmed feed
rate F .
3 The TNC returns the tool at FMAX to the setup clearance, dwells
there (if a dwell time was entered), and then moves at FMAX to
the setup clearance above the first plunging depth.
4 The tool then drills deeper by the plunging depth at the
programmed feed rate F .
5 The TNC repeats this process (2 to 4) until the programmed total
hole depth is reached.
6 At the hole bottom, the tool is retraced to set-up clearance or — if
programmed — to the 2nd set-up clearance in rapid traverse
FMAX.
Before programming, note the following:
Program a positioning block for the starting point (hole
center) in the working plane with RADIUS
COMPENSATION R0.
The algebraic sign for the depth parameter determines
the working direction.
Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface. Enter a
positive value.
Depth Q201 (incremental value): Distance between
workpiece surface and bottom of hole (tip of drill
taper)
Feed rate for plunging Q206: Traversing speed of the
tool during drilling in mm/min
Plunging depth Q202 (incremental value):
Infeed per cut The TNC will go to depth in one
movement if:
the plunging depth is equal to the depth
the plunging depth is greater than the depth
The depth does not have to be a multiple of the
plunging depth.
Dwell time at top Q210: Time in seconds that the tool
remains at set-up clearance after having been
retracted from the hole for chip release.
156
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Z
Q210
Q203
Example NC blocks:
7
Y L DEF 200 DRILLING
Q200=2
;SET-UP
Q201=-20
;DEPTH
Q206=150
;FEED RATE FOR PLUNGING
Q202=5
;PLUNGING DEPTH
Q210=0
;DWELL TIME AT TOP
Q203=+0
;SURFA E
Q204=50
;2. SET-UP
Q206
Q204
Q200
Q202
Q201
X
LEARAN E
OORDINATE
LEARAN E
8 Programming: Cycles
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