Maximum Velocity For Thread Cutting - Siemens SINUMERIK 840C Installation Instructions Manual

06.93
The maximum path velocity (defined with the input resolution) and the maximum axis velocity
together define the maximum velocities.
The interpolator breaks down the path velocity into its axis specific velocity components (axis
velocities). Then these values are converted to position control resolution. This conversion is
only possible if the relevant maximum velocities and their correlation to interpolation are
observed during programming. Alarm 2038, "Path feed too high" (reset alarm) is output if the
velocity is not possible. The alarm disables processing and NC Start.
Setting data item in "Dry-run feedrate" is still entered in 1000 IS units/mm. A maximum of 5
places can be displayed or entered via the keyboard (e.g. input resolution of 10
dry-run feedrate 9.999 m/min).
If more than 5 places are programmed using the CL 800 command in "SEN" or the command
@ 410, alarm 3040 "Field/variable cannot be displayed" is issued.

10.2.7 Maximum velocity for thread cutting

In the case of threading blocks G33, G34 and G35, the feedrate is calculated from the spindle
speed and the pitch rather than being based on the programmed (linear) feedrate. This
feedrate determines the tool path feedrate for the threading block.
Constant pitch thread cutting (G33)
For this type of threading, the tool path feedrate must not exceed the following limiting values.
-2
Input resolution: 10 mm :
-3
10 mm :
-4
10 mm :
-5
10 mm :
When programming thread cutting blocks, not only the maximum path velocity but also the
maximum axis velocity must be taken into consideration (see tables in Axis installation
Section).
Thread cutting with variable pitch (G34/G35)
Please follow the permissible limiting values for this type of thread cutting. This applies to path
velocity, axis velocity, pitch and spindle speed (see NC Programming Guide).
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
10.2.6 The influence of resolution on speed
< 1000 m/min
< 1000 m/min
< 1000 m/min
< 100 m/min
6FC5197- AA50
10 Axis and Spindle Installation
-4
mm max.
10–11