HEIDENHAIN TNC 426 (280 476) User Manual
Page 250
HEIDENHAIN TNC 426, TNC 430
223
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.
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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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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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Decrement
Q212 (incremental value): Value by which
the TNC decreases the plunging depth Q202.
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Minimum plunging depth
Q205 (incremental value): If
you have entered a decrement, the TNC limits the
plunging depth to the value entered with Q205.
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Upper advanced stop distance
Q258 (incremental
value): Set-up clearance for rapid traverse positioning
when the TNC moves the tool again to the current
plunging depth after retraction from the hole; value
for the first plunging depth
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Lower advanced stop distance
Q259 (incremental
value): Set-up clearance for rapid traverse positioning
when the TNC moves the tool again to the current
plunging depth after retraction from the hole; value
for the last plunging depth
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Infeed depth for chip breaking
Q257 (incremental
value): Depth at which the TNC carries out chip
breaking. There is no chip breaking if 0 is entered.
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Retraction rate for chip breaking
Q256
(incremental value): Value by which the TNC retracts
the tool during chip breaking
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Dwell time at depth
Q211: Time in seconds that the
tool remains at the hole bottom
Example: NC blocks
11 CYCL DEF 205 UNIVERSAL PECKING
Q200=2 ;SET-UP CLEARANCE
Q201=-80 ;DEPTH
Q206=150 ;FEED RATE FOR PLUNGING
Q202=5 ;PLUNGING DEPTH
Q203=+100 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
Q212=0.5 ;DECREMENT
Q205=3 ;MIN. PLUNGING DEPTH
Q258=0.5 ;UPPER ADV STOP DIST
Q259=1 ;LOWER ADV STOP DIST
Q257=5 ;DEPTH FOR CHIP BRKNG
Q256=0.2 ;DIST FOR CHIP BRKNG
Q211=0.25 ;DWELL TIME AT BOTTOM
If you enter Q258 not equal to Q259, the TNC will change
the advance stop distances between the first and last
plunging depths at the same rate.