HEIDENHAIN 530 (340 49x-07) Pilot - Manual (Page 147)

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Unit 140 Tilt Plane (FCL 2 function)
Unit 140 is used to define tilted working planes in various ways. You can
set the plane definition and positioning behavior separately.
The machine manufacturer must enable the functions for
tilting the working plane!
You can only use the PLANE function on machines that have
at least two tilting axes (head and/or table). Exception: The
PLANE AXIAL
function (FCL 3 function) can also be used if only
a single rotary axis is present or active on your machine