HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 229)

8-9
8 Cycles
TNC 426/TNC 425/TNC 415 B/TNC 407
Fig. 8.4: Input data for THREAD CUTTING
cycle
Z
X
A
B
8.2 Simple Fixed Cycles
THREAD CUTTING (G86)
Machine and control must be specially prepared by the machine manufacturer to enable thread cutting.
Process
Cycle G86 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 manufacturer can give you further information.
Input data
• THREADING DEPTH A :
Distance between current tool position and end of thread. The algebra-
ic sign determines the working direction: a negative value means
negative working direction.
• THREAD PITCH B :
The sign differentiates between right-hand and left-hand threads:
+ = right-hand thread
(M3 with negative THREADING DEPTH)
– = left-hand thread (M4 with negative THREADING DEPTH)
• The control 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/M4 before cycle call.