Siemens sinumerik 840D sl Function Manual page 139

Detailed description
2.1 "Gantry axes" function
Application
On large gantry-type milling machines, various axis units (e.g. gantry or crossbeam) are
moved by a number of drives, which are mutually independent. Each drive has its own
measuring system and thus constitutes a complete axis system. When these mechanically
rigidly-coupled axes are traversed, both drives must be operated in absolute synchronism in
order to prevent canting of mechanical components (resulting in power/torque transmission).
Figure 2-1
The purpose of the "gantry axes" function is to control and monitor machine axes which are
rigidly coupled in this way.
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
Example: Gantry-type milling machine with 2 gantry groupings
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