Rigid Tapping (Cycle 17) - HEIDENHAIN TNC 370 User Manual

8 Cycles
L
8.2 Drilling Cycles
RIGID TAPPING (Cycle 17)
Machine and conrral mw be sps~ialty prepared hy the machine wol builder to snabfe rigid tapping.
Note;
. Prqpm a positioning block far the starting paint [Me center) in the ~3rking plane with radius compensation RO.
* Program B positioning black for the starting paint in the tobl axis lsetup clearance
ztbom
the workpiece surfacef+
* The algebraic- sign for ~+~y~le paramster TOTAL HQLE DEPTH defines the working difemion.
* The control cafcutatas the feed rate from ttte spindle speed and thread pitch. If the splndfe spe@d override is
used
during tapping, the feed fate is automaticatty adjusted.
* The feed rate override knob is disabled.
*
Process
The thread is cut without a floating tap holder in one or more passes.
Rigid tapping offers the following advantages over tapping with a floating
tap holder:
-.-
L-
l
Higher machining speeds possible
l
Repeated tapping of the same thread; repetitions are enabled via
spindle orientation to the 0" position during cycle call (depending on
machine parameter settings)
l
Increased traverse range of the spindle axis due to absence of a
floating tap holder
Input data
l
SET-UP CLEARANCE @ (incremental value):
Distance between tool tip (starting position) and workpiece surface.
l
TOTAL HOLE DEPTH @) (incremental value):
Distance between workpiece surface (beginning of thread) and end of
thread.
l
PITCH 0:
The sign differentiates between right-hand and left-hand threads:
+ = right-hand thread
-
= left-hand thread
1
Fig.
8.8:
Input
data for RIGID TAPPING
cycle
TNC 370
8-13