Siemens SINUMERIK 808D User Manual page 173

The value for the thread lead can be defined either as the thread size (for metric threads between M3 and M48 only) or as a
value (distance from one thread turn to the next as a numerical value). Any parameters not required are omitted in the call or
assigned the value zero.
If the two lead parameters have conflicting values, alarm 61001 "Thread lead wrong" is generated by the cycle and cycle
execution is aborted.
N o te
Depending on the settings in machine data MD30200 $MA_NUM_ENCS, the cycle selects whether tapping is to be
performed with or without encoder.
The direction of rotation for the spindle must be programmed with M3 or M4.
In thread blocks with G63, the values of the feedrate override switch and spindle speed override switch are frozen to 100%.
A longer compensating chuck is usually required for tapping without encoder.
AXN (tool axis)
The following figure presents the options for the drilling axes to be selected.
With G17:
● AXN=1; Corresponds to X
● AXN=2; Corresponds to Y
● AXN=3; Corresponds to Z
Using AXN (number of the drilling axis) to program the drilling axis enables the drilling axis to be directly programmed.
AXN=1
AXN=2
AXN=3
For example, to machine a hole in the G17 plane with Z axis, you program:
G17
AXN=3
Programming example: Tapping without encoder
In this program, a thread is tapped without encoder at position X35 Y35 in the XY plane; the tapping axis is the Z axis. The
parameters SDR and SDAC for the direction of rotation must be assigned; parameter ENC is assigned the value 1, the value
for the depth is the absolute value. Lead parameter PIT can be omitted. A compensating chuck is used in machining.
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017
1st axis of the current plane
2nd axis of the current plane
3rd axis of the current plane
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