Siemens SINUMERIK 802D sl Function Manual page 412

Feed (V1)
24.1 Path feedrate F
Information
● The spindle speed override switch should remain unchanged during thread machining
● The feedrate override switch is irrelevant in a block with G33, G34, G35.
Programmable runin and runout path: DITS, DITE
The run-in and run-out path is to be traversed in addition to the required thread. The starting
and braking of the axis (both axes in case of a tapered thread) are performed in these areas.
This path depends on the pitch, spindle speed, and the axis dynamics (configuration).
If the available path for run-in or run-out is limited, it may be necessary to reduce the spindle
speed so that this path is sufficient. In this case, the run-in and run-out paths can be
specified separately in the program to achieve favorable cutting values and short machining
times or to simplify the handling of this issue.
If no values are specified, the values from the setting data (SD) apply. The specifications in
the program are written in SD42010 THREAD_RAMP_DISP[0] ... [1].
If this path is not sufficient for traversing at the configured axis acceleration, the axis is
overloaded in terms of acceleration. Alarm 22280 ("Programmed run-in path too short") is
then issued for the thread run-in. The alarm is purely for information and has no effect on
part program execution.
The run-out path acts as an approximate distance at the end of the thread. This achieves a
smooth change in the axis movement when retracting.
Programming
DITS= ...: Run-in path of the thread
DITE= ...: Run-out path of the thread
Reference:
/BP_/ Operation and Programming
SD42010
Only paths, and not positions, are programmed with DITS and DITE.
With the part program instructions, the setting data SD42010 THREAD_RAMP_DISP[0], ...[1]
defines the following acceleration response of the axis during thread cutting ([0]-run-in, [1]-
run-out):
412
(tapping).
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0