Programmable Run-In And Run-Out Path For G33: Dits, Dite - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

See the following example of multi-block thread chaining:
Axis velocity
With G33 threads, the velocity of the axes for the thread length is determined on the basis of the spindle speed and the
thread lead. The feedrate F is not relevant. It is, however, stored. However, the maximum axis velocity (rapid traverse)
defined in the machine data cannot be exceeded. This will result in an alarm.
Information
Important
● The spindle speed override switch should remain unchanged for thread machining.
● The feedrate override switch has no meaning in this block.
8.5.2

Programmable run-in and run-out path for G33: DITS, DITE

Functionality
The run-in and run-out path must also be traversed to the required thread with thread G33. 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 thread lead, 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 into SD42010: THREAD_RAMP_DISP[0] ... [1].
If this path is not sufficient for the traversing with 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 a rounding clearance at the end of the thread. This achieves a smooth change in the axis
movement when retracting.
Programming
DITS=...
DITE=...
Values for DITS and DITE or SD42010: THREAD_RAMP_DISP
-1 ... < 0: Starting/braking of the feed axis is carried out with the configured acceleration.
Jerk according to current BRISK/SOFT programming.
0: Abrupt starting/braking of the feedrate axis on thread cutting.
> 0: The run-in/run-out path of the thread is predefined for G33.
To avoid alarm 22280, the acceleration limits of the axis must be observed in case of very small run-in and
run-out paths.
Note: The value of SD42010 after reset/program start is -1.
78
; Run-in path of thread for G33
; Run-out path of thread for G33
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015