Siemens SINUMERIK 840D sl Programming Manual page 229

The thread axis is accelerated or braked along the specified path.
①
Short run-in path
Due to the collar on the thread runin, little room is left for the tool start ramp.
This must therefore be specified shorter via DITS.
Short run-out path
Because of the shoulder at the thread run-out, there is not much room for the tool braking ramp,
introducing a risk of collision between the workpiece and the tool cutting edge. The deceleration
ramp can be specified shorter using DITE. Due to the inertia of the mechanical system,
however, a collision can still occur.
Remedy: Program a shorter thread, reduce the spindle speed.
Note
DITE acts at the end of the thread as a rounding clearance. This achieves a smooth change in
the axis motion.
Effects
The programmed run-in and run-out path only increases the rate of acceleration on the path. If
one of the two paths is set larger than the thread axis needs with active acceleration, the thread
axis is accelerated or decelerated with maximum acceleration.
Syntax
DITS=<Value> DITE=<Value>
Meaning
DITS:
DITE:
<value>:
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Run-in/run-out path, depending on the machining direction
Define thread run-in path
Define thread run-out path
Only paths, and not positions, are programmed with DITS and DITE.
The programmed run-in/run-out path is handled according to the current dimension
setting (inches, metric).
Fundamentals
2.9 Motion commands
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