G1: Gantry Axes; Brief Description - Siemens SINUMERIK 840D sl Function Manual

G1: Gantry axes

3.1

Brief description

For gantry machines, each of various machine elements, such as the gantry and the transverse
beams, are moved by several axes that operate in parallel. The axes that together move a
machine part, are designated as gantry axes or gantry grouping. Because of the mechanical
structure, the gantry axes are rigidly connected with each other and so must always be
traversed synchronously by the control.
Figure 3-1
Guide axis
The guide axis of the gantry grouping is the axis that represents the gantry grouping. Only this
axis is programmed to perform the traversing movements of the gantry grouping.
Synchronous axes
The synchronous axes of the gantry grouping are the axes that because of their coupling with
the guide axis are also automatically traversed by the control. A guide axis can be assigned
any number of synchronous axes.
Synchronization difference
The synchronous operation difference is the deviation of the axial actual value of a
synchronous axis from its ideal position referred to the actual value of the guide axis. The
control continually monitors the synchronous operation difference. A message is displayed if
the alarm limit is exceeded. The complete gantry grouping is stopped when the alarm limit is
exceeded. The limit values can be parameterized as machine data.
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Example: Gantry-type milling machine with gantry and transverse beams
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