Siemens SINUMERIK 840D sl Function Manual page 1736

Detailed description
2.1 Path feedrate F
2.1.4.2 Programmable run-in and run-out path for G33, G34 and G35
Application
Figure 2-2
• Short run-in path
• Short run-out path
The programmed runin and runout 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.
Activation
The DITS and DITE functions are always active during thread cutting.
Example:
N...
N59 G90 G0 Z100 X10 SOFT M3 S500
N60 G33 Z50 K5 SF=180 DITS=1 DITE=3
N61 G0 X20
20
Runin or runout path too short
Due to the collar on the thread runin, little room is left for the tool (T) start ramp.
This must therefore be set shorter via DITS.
Due to the collar on the thread run-out, little room is left for the tool deceleration ramp,
leading to the risk of collision between the workpiece and the tool edge. The tool braking
ramp can be set shorter via DITE. Due to the inertia of the mechanical system, however,
a collision can nevertheless occur.
Remedy: Program a shorter thread, reduce the spindle speed.
; Start of corner rounding with
Z=53
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0