8 Programming: Cycles
158
BORING (Cycle 202)
Machine and control must be specially prepared by the
machine tool builder to enable Cycle 202.
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 programmed depth at the feed rate for
plunging.
3 If programmed, the tool remains at the hole bottom for the
entered dwell time with active spindle rotation for cutting free.
4 The TNC then orients the spindle to the 0° position
with an oriented spindle stop.
5 If retraction is selected, the tool retracts in the programmed
direction by 0.2 mm (fixed value).
6 The tool then retracts to set-up clearance at the retraction feed
rate, and from there — if programmed — to the 2nd set-up
clearance in 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 cycle parameter TOTAL HOLE
DEPTH determines the working direction.
After the cycle is completed, the TNC restores the
coolant and spindle conditions that were active before
the cycle call.
ú
Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.
ú Depth Q201 (incremental value): Distance between
workpiece surface and bottom of hole
ú
Feed rate for plunging Q206: Traversing speed of the
tool during boring in mm/min
ú
Dwell time at depth Q211: Time in seconds that the
tool remains at the hole bottom
ú
Retraction feed rate Q208: Traversing speed of the
tool in mm/min when retracting from the hole. If you
enter Q208 = 0, the tool retracts at feed rate for
plunging.
ú
Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
ú 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
X
Z
Q200
Q201
Q206
Q211
Q203
Q204
Q208
8.2 Drilling Cycles
Example NC blocks:
9 CYCL DEF 202 BORING
Q200=2 ;SET-UP CLEARANCE
Q201=-20 ;DEPTH
Q206=150 ;FEED RATE FOR PLUNGING
Q211=0.5 ;DWELL TIME AT BOTTOM
Q208=500 ;RETRACTION FEED TIME
Q203=+0 ;SURFACE COORDINATE
Q204=50 ;2. SET-UP CLEARANCE
Q214=1 ;DISENGAGING DIRECTN
kkap8.pm6 30.06.2006, 07:03158
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