HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 228)

8-8
8 Cycles
TNC 426/TNC 425/TNC 415 B/TNC 407
8.2 Simple Fixed Cycles
RIGID TAPPING (G85)
Machine and control must be specially prepared by the machine manufacturer to enable rigid tapping.
Process
The thread is cut without a floating tap holder in one or several passes.
Rigid tapping offers the following advantages over tapping with a floating
tap holder:
• Higher machining speeds possible
• Repeated tapping of the same thread; repetitions are enabled via
spindle orientation to the 0° position during cycle call (depending on
machine parameter 7160; see page 11-13).
• Increased traverse range of the spindle axis due to absence of a
floating tap holder
• The control calculates the feed rate from the spindle speed. If the spindle speed override is used during
tapping, the feed rate is automatically adjusted.
• The feed rate override knob is disabled.
Input data
• SETUP CLEARANCE A :
Distance between tool tip (at starting position) and workpiece surface.
• TAPPING DEPTH B :
Distance between workpiece surface (beginning of thread) and end of
thread. The algebraic sign determines the working direction: a negative
value means negative working direction.
• THREAD PITCH C :
The sign differentiates between right-hand and left-hand threads:
+ = right-hand thread
– = left-hand thread
Fig. 8.3: Input data for RIGID TAPPING
cycle
C
Z
X
A
B