HEIDENHAIN TNC 426 B User Manual page 197

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Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.
Depth Q201 (incremental value): Distance between
workpiece surface and bottom of slot
Feed rate for milling Q207: Traversing speed of the
tool in mm/min while milling.
Plunging depth Q202 (incremental value): Total extent
by which the tool is fed in the tool axis during a
reciprocating movement.
Machining operation (0/1/2) Q215:
Define the extent of machining:
0: Roughing and finishing
1: Roughing only
2: Finishing only
Workpiece SURFACE COORDINATE Q203 (absolute
value): Coordinate of the workpiece surface
2nd set-up clearance Q204 (incremental value): Z
coordinate at which no collision between tool and
workpiece (clamping devices) can occur.
Center in 1st axis Q216 (absolute value): Center of the
slot in the main axis of the working plane
Center in 2nd axis Q217 (absolute value): Center of the
slot in the secondary axis of the working plane
Pitch circle diameter Q244: Enter the diameter of the
pitch circle
Second side length Q219: Enter the slot width. If you
enter a slot width that equals the tool diameter, the
TNC will carry out the roughing process only (slot
milling).
Starting angle Q245 (absolute value): Enter the polar
angle of the starting point.
Angular length Q248 (incremental value): Enter the
angular length of the slot
182
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Y
Q248
Q219
Q217
Q216
Example NC blocks:
52
Y L DEF 211
IR ULAR SLOT
Q200=2
;SET-UP
Q201=-20
;DEPTH
Q207=500
;FEED RATE FOR MILLING
Q202=5
;PLUNGING DEPTH
Q215=0
;MA HINING OPERATION
Q203=+0
;SURFA E
Q204=50
;2. SET-UP
Q216=+50
; ENTER IN 1ST AXIS
Q217=+50
; ENTER IN 2ND AXIS
Q244=80
;PIT H
Q219=12
;2ND SIDE LENGTH
Q245=+45
;STARTING ANGLE
Q248=90
;ANGULAR LENGTH
Q245
X
LEARAN E
OORDINATE
LEARAN E
IR LE DIAMETER
8 Programming: Cycles

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