12 Functional Descriptions 12.93
12.18.14 Special cases of gearbox interpolation
12.18.14.2 Gantry axes; machines with forced coupling
Several gantry axis pairs can be configured if only the "Gantry axis"
option is set. The selected gearbox interpolation type is subject to the
following restrictions:
– Only one leading axis permitted per following axis
– Fixed coupling ratio of 1:1 or -1:1
– No programming using G commands possible
– Coupling can be defined only via input display or read-in of GIA
data
For gantry axis applications, two mechanically coupled machine axes must be traversed
synchronously by mutually independent axis drives. A gantry milling machine is an example of
a typical application.
Y
XX
1
Gantry axes
Z
With gantry axes, the two axes should be traversed as one. In addition, only one axis (e.g. X)
must be programmed by the user.
The link can be activated immediately after reference point approach or when absolute
encoders are installed and will then be maintained in all operating modes.
The set configuration is stored. Reconfiguration or, if required, switchover of the link factor can
be inhibited for the appropriate following axis by means of machine data settings.
12–170
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SINUMERIK 840C (IA)