HEIDENHAIN TNC 320 (340 55x-03) User Manual
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8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
Set-up clearance
Q200 (incremental value): Distance
between tool tip and workpiece surface.
Depth of counterbore
Q249 (incremental value):
Distance between underside of workpiece and the
top of the hole. A positive sign means the hole will be
bored in the positive spindle axis direction.
Material thickness
Q250 (incremental value):
Thickness of the workpiece.
Off-center distance
Q251 (incremental value): Off-
center distance for the boring bar; value from tool
data sheet.
Tool edge height
Q252 (incremental value): Distance
between the underside of the boring bar and the main
cutting tooth; value from tool data sheet.
Feed rate for pre-positioning
Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min.
Feed rate for countersinking
Q254: Traversing
speed of the tool during countersinking in mm/min.
Dwell time
Q255: Dwell time in seconds at the top of
the bore hole.
Workpiece surface coordinate
Q203 (absolute
value): Coordinate of the workpiece surface.
2nd set-up clearance
Q204 (incremental value):
Coordinate in the spindle axis at which no collision
between tool and workpiece (clamping devices) can
occur.
Disengaging direction (0/1/2/3/4)
Q214:
Determine the direction in which the TNC displaces
the tool by the off-center distance (after spindle
orientation). Input of 0 is not permitted.
Example: NC blocks
11 CYCL DEF 204 BACK BORING
Q200=2
;SET-UP CLEARANCE
Q249=+5
;DEPTH OF COUNTERBORE
Q250=20
;MATERIAL THICKNESS
Q251=3.5
;OFF-CENTER DISTANCE
Q252=15
;TOOL EDGE HEIGHT
Q253=750
;F PRE-POSITIONING
Q254=200
;F COUNTERSINKING
Q255=0
;DWELL TIME
Q203=+20
;SURFACE COORDINATE
Q204=50
;2ND SET-UP CLEARANCE
Q214=1
;DISENGAGING DIRECTN
Q336=0
;ANGLE OF SPINDLE
1
Retract tool in the negative ref. axis direction
2
Retract tool in the neg. minor axis direction
3
Retract tool in the positive ref. axis direction
4
Retract tool in the pos. minor axis direction