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HEIDENHAIN iTNC 530 (340 49x-04) User Manual

Page 384

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384

8 Programming: Cycles

8.5 Cy

cles f

o

r Dr

illing, T

a

pping and Thr

ead Milling

Set-up clearance

Q200 (incremental value): Distance

between tool tip (at starting position) and workpiece
surface.

Thread depth

Q201 (incremental value): Distance

between workpiece surface and end of thread.

Pitch

Q239

Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+ = right-hand thread
= left-hand thread

Workpiece surface coordinate

Q203 (absolute

value): Coordinate of the workpiece surface.

2nd set-up clearance

Q204 (incremental value):

Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.

Infeed depth for chip breaking

Q257 (incremental

value): Depth at which TNC carries out chip breaking

Retraction rate for chip breaking

Q256: The TNC

multiplies the pitch Q239 by the programmed value
and retracts the tool by the calculated value during
chip breaking. If you enter Q256 = 0, the TNC retracts
the tool completely from the hole (to the set-up
clearance) for chip release.

Angle for spindle orientation

Q336 (absolute

value): Angle at which the TNC positions the tool
before machining the thread. This allows you to
regroove the thread, if required.

RPM factor for retraction

Q403: Factor by which

the TNC increases the spindle speed—and therefore
also the retraction feed rate—when retracting from
the drill hole. Input range: 0.0001 to 10

Retracting after a program interruption

If you interrupt program run during thread cutting with the machine
stop button, the TNC will display the MANUAL OPERATION soft key.
If you press the MANUAL OPERATION soft key, you can retract the
tool under program control. Simply press the positive axis direction
button of the active tool axis.

Example: NC blocks

26 CYCL DEF 209 TAPPING W/ CHIP BRKG

Q200=2

;SET-UP CLEARANCE

Q201=-20

;DEPTH

Q239=+1

;PITCH

Q203=+25

;SURFACE COORDINATE

Q204=50

;2ND SET-UP CLEARANCE

Q257=5

;DEPTH FOR CHIP BRKNG

Q256=+25

;DIST. FOR CHIP BRKNG

Q336=50

;ANGLE OF SPINDLE

Q403=1.5

;RPM FACTOR

Z

X

Q203

Q204

Q200

Q201

Q239