Siemens SINUMERIK 808D Function Manual

Function Manual
174 01/2017
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:
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual
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):
● SD42010 = < 0 to -1:
Starting/braking of the feedrate axis at configured acceleration rate. Jerk according to current BRISK/SOFT programming.
● SD42010 = 0:
Abrupt starting/braking of the feedrate axis on thread cutting.
● SD42010 = > 0:
The thread run-up/deceleration distance is specified. To avoid technology alarm 22280, the acceleration limits of the axis
must be observed in case of very small run-in and run-out paths.
Note
DITE acts at the end of the thread a
s an approximate distance. This achieves a smooth change in the axis movement.
Pitch change F with G34, G35
If you already know the starting and final lead of a thread, you can calculate the pitch change F to be programmed according
to the following equation:
The identifiers have the following meanings:
K
e
Pitch of axis target point coordinate [mm/rev]
K
a
Initial pitch (progr. under I and K) [mm/rev]
L
G
Thread length in [mm]
18.1.3
Feedrate for G63 (tapping with compensation chuck)
Feedrate F
In the case of G63 it is necessary to program a feedrate F. It must be suitable for the selected spindle speed S (programmed
or set) and for the pitch of the drill:
Feedrate F [mm/min] = speed S [rev/min] x pitch [mm/rev]
The compensation chuck absorbs possible path differences of the drill axis to a limited extent.
Reference:
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English