Examples; Creating A Gantry Grouping - Siemens SINUMERIK 840D Function Manual

Differences in comparison with the "Coupled motion" function
The main differences between the "gantry axes" and "coupled motion" functions are listed
below:
● The axis coupling between the gantry axes must always be active. Separation of the axis
coupling via part program is therefore not possible for gantry axes. In contrast, the coupled
axis grouping can be separated by means of the part program and the axes then traversed
individually.
● In the "Gantry Axes" function, the difference of the actual position values from the guide axis
and synchronous axis is monitored continuously and the traversing motion is shut down if
there are impermissible deviations. There is no monitoring for the "Coupled motion" function.
● Gantry axes must remain coupled even during referencing. For this reason, special
procedures are applied for the reference point approach of gantry axes. In contrast, coupled-
motion axes are referenced as individual axes.
● For the gantry axes to traverse without mechanical offset, the synchronous axes must be set
like the guide axes from the control dynamics perspective. In contrast, the "coupled motion"
function permits axes with different dynamic control response characteristics to be coupled.
Further information:
Coupled motion (Page 419)
Block search with active coupling
Note
For an active coupling, it is recommended to only use block search type 5, "Block search via
program test" (SERUPRO) for a block search.
9.8

Examples

9.8.1

Creating a gantry grouping

Introduction
Setting up gantry grouping, referencing its axes, aligning possible offsets - and finally,
synchronizing the axes involved, are complicated procedures. The individual steps involved in
the process are explained below by an example constellation.
Constellation
Machine axis 1 = gantry leading axis, incremental measuring system
Machine axis 3 = gantry synchronized axis, incremental measuring system
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
G1: Gantry axes
9.8 Examples
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