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HEIDENHAIN TNC 426 B, TNC 430
THREAD CUTTING (Cycle 18)
Machine and control must be specially prepared by the
machine tool builder to enable thread cutting.
Cycle 18 THREAD CUTTING is performed by means of spindle
control. The tool moves with the active spindle speed from its
current position to the entered depth. As soon as it reaches the end
of thread, spindle rotation is stopped. Tool approach and departure
must be programmed separately. The most convenient way to do
this is by using OEM cycles. The machine tool builder can give you
further information.
Before programming, note the following:
The TNC calculates the feed rate from the spindle speed.
If the spindle speed override is used during thread
cutting, the feed rate is automatically adjusted.
The feed-rate override knob is disabled.
The TNC automatically activates and deactivates spindle
rotation. Do not program M3 or M4 before cycle call.
ú
Total hole depth : Distance between current tool
position and end of thread.
The algebraic sign for the total hole depth determines
the working direction (a negative value means a
negative working direction in the tool axis)
ú
PITCH :
Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+
= right-hand thread (M3 with negative depth)
–
= left-hand thread (M4 with negative depth)
8.2 Dr
illing Cy
cles
X
Z
Example NC blocks:
22 CYCL DEF 18.0 THREAD CUTTING
23 CYCL DEF 18.1 DEPTH -20
24 CYCL DEF 18.2 PITCH +1
kkap8.pm6
30.06.2006, 07:03
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Summary of Contents for TNC 426 B
Page 3: ...BAUSKLA PM6 30 06 2006 07 03 2 www EngineeringBooksPdf com ...
Page 4: ...BAUSKLA PM6 30 06 2006 07 03 3 www EngineeringBooksPdf com ...
Page 6: ...CINHALT PM6 30 06 2006 07 03 2 www EngineeringBooksPdf com ...
Page 16: ...CINHALT PM6 30 06 2006 07 03 12 www EngineeringBooksPdf com ...
Page 17: ...Introduction 1 Dkap1 pm6 30 06 2006 07 03 1 www EngineeringBooksPdf com ...
Page 29: ...Manual Operation and Setup 2 Dkap2_3 pm6 30 06 2006 07 03 13 www EngineeringBooksPdf com ...
Page 83: ...Programming Tools 5 Fkap5 pm6 30 06 2006 07 03 67 www EngineeringBooksPdf com ...
Page 106: ...Fkap5 pm6 30 06 2006 07 03 90 www EngineeringBooksPdf com ...
Page 107: ...Programming Programming Contours 6 Gkap6 pm6 30 06 2006 07 04 91 www EngineeringBooksPdf com ...
Page 165: ...Hkap7 pm6 30 06 2006 07 03 150 www EngineeringBooksPdf com ...
Page 166: ...Programming Cycles 8 kkap8 pm6 30 06 2006 07 03 151 www EngineeringBooksPdf com ...
Page 253: ...kkap8 pm6 30 06 2006 07 04 238 www EngineeringBooksPdf com ...
Page 265: ...LKAP9 PM6 30 06 2006 07 04 250 www EngineeringBooksPdf com ...
Page 266: ...Programming Q Parameters 10 MKAP10 PM6 30 06 2006 07 04 251 www EngineeringBooksPdf com ...
Page 297: ...MKAP10 PM6 30 06 2006 07 04 282 www EngineeringBooksPdf com ...
Page 298: ...Test Run and Program Run 11 NKAP11 PM6 30 06 2006 07 04 283 www EngineeringBooksPdf com ...
Page 312: ...MOD Functions 12 Okap12 pm6 30 06 2006 07 04 297 www EngineeringBooksPdf com ...
Page 332: ...Tables and Overviews 13 Pkap13 pm6 30 06 2006 07 04 317 www EngineeringBooksPdf com ...