Siemens sinumerik 808d Programming And Operating Manual page 125

DTB (dwell time)
The dwell time must be programmed in seconds. When tapping blind holes, it is
recommended that you omit the dwell time.
SDAC (direction of rotation after end of cycle)
Under SDAC, the direction of rotation after end of cycle is programmed.
For tapping, the direction is changed automatically by the cycle.
MPIT and PIT (thread lead as a thread size and as a value)
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.
RH or LH threads are defined by the sign of the lead parameters:
● Positive value → right (same as M3)
● Negative value → left (same as M4)
If the two lead parameters have conflicting values, alarm 61001 "Thread lead wrong" is
generated by the cycle and cycle execution is aborted.
POSS (spindle position)
Before tapping, the spindle is stopped with orientation in the cycle by using the command
SPOS and switched to position control.
The spindle position for this spindle stop is programmed under POSS.
SST (speed)
Parameter SST contains the spindle speed for the tapping block with G331.
SST1 (retraction speed)
The speed for retraction from the tapped hole is programmed under SST1.
If this parameter is assigned the value zero, retraction is carried out at the speed
programmed under SST.
AXN (tool axis)
By programming the drilling axis via AXN, it is possible to omit the switchover from plane
G18 to G17 when the deep-hole drilling cycle is used on turning machines.
The identifiers have the following meanings:
AXN=1
AXN=2
AXN=3
For example, to machine a center hole (in Z) in the G18 plane, you program:
G18
AXN=1
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
First axis of the current plane
Second axis of the current plane
Third axis of the current plane
Cycles
2.4 Drilling cycles
125