HEIDENHAIN TNC 620 User Manual page 116

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Another feature is OEM-OFFSET, which is available only
to the machine tool builder. OEM-OFFSET can be used to
define additive axis shifts for rotary and parallel axes.
The sum of all OFFSET values (from all the above
OFFSET input options) results in the difference between
the ACTL. position and the RFACTL position of an axis.
The control converts all movements in the machine coordinate
system, independent of the reference system used for value input.
Example of a 3-axis machine tool with a Y axis as oblique axis, not
arranged perpendicularly to the ZX plane:
In the Positioning w/ Manual Data Input operating mode, run an
NC block with L IY+10
The control determines the required axis nominal values from the
defined values.
During positioning the control moves the Y and Z machine axes.
The RFACTL and RFNOML displays show movements of the Y
axis and Z axis in the machine coordinate system.
The ACTL. and NOML. displays only show one movement of the
Y axis in the input coordinate system.
In the Positioning w/ Manual Data Input operating mode, run an
NC block with L IY-10 M91
The control determines the required axis nominal values from the
defined values.
During positioning the control only moves the Y machine axis.
The RFACTL and RFNOML displays only show one movement of
the Y axis in the machine coordinate system.
The ACTL. and NOML. displays show movements of the Y axis
and Z axis in the input coordinate system.
The user can program positions related to the machine datum, e.g.
by using the miscellaneous function M91.
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HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022
Fundamentals | NC fundamentals