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Special case:
Reference-point
setting with the
PLANE function,
Hirth axes and
M114
Spatial angle C ≠ 0
July 2013
Open-loop axes:
The user must enter the current positions of the tilting axes by using the 3-D
ROT soft key.
Note
In the combination of coordinate transformation cycles, note the sequence
of activation and deactivation.
If rotary axes with Hirth coupling are positioned via PLC or NC, then as
mentioned above, angles can only be entered according to a certain grid.
Machining can be performed in any plane by tilting the plane with the PLANE
function and programming the rotary axis grid coordinates with M114
(automatic compensation of the machine geometry when working with tilting
axes).
It is possible to save and set reference points in this state.
The iTNC then uses the nominal positions of the rotary axes programmed in
M114 to calculate the reference point. With MP7493 the machine
manufacturer can enter a maximum deviation of the rotary axes based on the
nominal position resulting from the orientation of the working plane. The
control accepts this deviation when setting reference points and when
measuring with M114. The default value for this machine parameter is 0.005.
The iTNC uses the current ACTUAL/NOMINAL positions (MP7682, bit 1) of
the rotary axes to calculate the reference point.
Note
Please note that in this procedure the tool might not be perpendicular to the
tilted working plane.
MP7493
Maximum deviation of the current tool orientation relative
to the tool axis when setting a reference point with the
PLANE function with M114
Input:
0.0000 to 30.0000 [degrees]
Default: 0.005
On machines with C tables and tool axis Z, the spatial angle C ≠ 0 (with A = 0
and B = 0) can be realized through a rotation of the coordinate system or a
rotation of the table:
With MP7500 bit 6 = 0, the spatial angle C is realized through a rotation of
the coordinate system.
With MP7500 bit 6 = 1, the spatial angle C is realized through a rotation of
the table. At the same time, the angle is saved in Q122. This makes it
possible, for example, to machine a workpiece in the X/Y plane by always
using the same axis for paraxial linear blocks.
6.5 Tilting and swivel axes
763
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