6.5.2 Describing the Mechanical Offset
Describing the
mechanical offset
6 – 62
Determine the mechanical offset of the axes in the home position. For swivel
heads, the starting point is the tool datum; for tilting tables, the starting point
is the center of rotation of the first axis (as seen from the workpiece):
7 7 7 7
Only for tilting tables: Define the center of rotation of the first tilting axis with
respect to the machine datum.
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Determine in sequence the linear or rotary offset to the next tilting axis until
you reach a point that is not separated from the machine frame by any free
tilting axis.
7 7 7 7
In MP7510.x, enter the sequence of the transformed axes, in MP7520.x the
type of axis and dimensional data, and in MP7530.x enter the value of the
offset. See the examples on the following pages.
7 7 7 7
In MP7550.x, enter the home position of the tilting device in the machine
coordinate system.
If a rotation has been entered, it must be canceled again in an additional
transformation.
Compensation of mechanical offset when exchanging the spindle head:
7 7 7 7
With MP7500 bit 4 = 0, the mechanical offset is only compensated when
M128, M114 or "tilted working plane" is called.
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With MP7500 bit 4 = 1 you must compensate the mechanical offset by
means of a PLC datum shift. This allows the mechanical offset to be
compensated during all tilting axis movements, and not just when M128,
M114 or "tilted working plane" is called. You can also use functions M144
or M145; (See "Miscellaneous function M144/M145" on page 6 – 84).
HEIDENHAIN Technical Manual TNC 426, TNC 430