HEIDENHAIN TNC 426 (280 476) User Manual
Page 240
HEIDENHAIN TNC 426, TNC 430
213
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
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Set-up clearance
Q200 (incremental value): Distance
between tool tip and workpiece surface. Enter a
positive value.
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7
Depth
Q201 (incremental value): Distance between
workpiece surface and bottom of hole (tip of drill
taper)
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Feed rate for plunging
Q206: Traversing speed of
the tool during drilling in mm/min
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Plunging depth
Q202 (incremental value): Infeed per
cut. The depth does not have to be a multiple of the
plunging depth. The TNC will go to depth in one
movement if:
n
the plunging depth is equal to the depth
n
the plunging depth is greater than the depth
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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tool remains at set-up clearance after having been
retracted from the hole for chip release.
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Workpiece surface coordinate
Q203 (absolute
value): Coordinate of the workpiece surface
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2nd set-up clearance
Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
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Dwell time at depth
Q211: Time in seconds that the
tool remains at the hole bottom
Example: NC blocks
10 L Z+100 R0 FMAX
11 CYCL DEF 200 DRILLING
Q200 = 2 ;SET-UP CLEARANCE
Q201 = -15 ;DEPTH
Q206 = 250 ;FEED RATE FOR PLUNGING
Q202 = 5 ;PLUNGING DEPTH
Q210 = 0 ;DWELL TIME AT TOP
Q203 = +20 ;SURFACE COORDINATE
Q204 = 100 ;2ND SET-UP CLEARANCE
Q211 = 0.1 ;DWELL TIME AT BOTTOM
12 L X+30 Y+20 FMAX M3
13 CYCL CALL
14 L X+80 Y+50 FMAX M99
15 L Z+100 FMAX M2