HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 86)

TNC 426/TNC 425/TNC 415 B/TNC 407 2 - 2 5
2 Manual Operation and Setup
2.7 Tilting the Working Plane
Machines with swivel heads:
• You must bring the tool into the desired position for machining by
positioning the swivel head, for example with a G00 block.
• The position of the transformed tool axis (like the position of the tool)
changes in relation to the machine-based coordinate system. Thus if
you rotate the swivel head—and therefore the tool—in the B axis by
+90° for example, the coordinate system rotates also. If you press the
Z+ axis direction button in the MANUAL OPERATION mode, the tool
moves in X+ direction of the machine-based coordinate system.
• In calculating the transformed coordinate system the TNC considers the
mechanically influenced offsets of the particular swivel head (the so-
called “translational” components) and the offsets caused by tilting of
the tool (3D tool length compensation).
Traversing reference points with tilted axes
When axes are tilted, the reference points are traversed by pressing the
machine axis direction buttons. The TNC interpolates the tilted axes. Make
sure that the tilting function is active in the manual operating mode and
that the actual angle value of the tilted axis was correctly entered in the
menu (see page 2-26).
Setting the datum in a tilted coordinate system
After you have positioned the tilted axes, set the datum in the same way
as for non-tilted axes: either manually by touching the workpiece with the
tool (see page 2-7), or (much more easily) by allowing the part program to
automatically set the datum with the aid of the HEIDENHAIN 3D touch
probe (see page 2-14).
The TNC then converts the datum for the tilted coordinate system. The
angular values for this calculation are taken from the menu for manual
tilting, regardless of whether the tilting function is active or not.
The angular values entered in the menu for manual tilting (see page 2-26) must correspond to the actual position(s)
of the tilted axis or axes. The TNC will otherwise calculate a wrong datum.
Position display in the tilted system
The positions displayed in the status window (NOML and ACTL) are in
the tilted coordinate system.
Limitations on working with the tilting function
• The touch probe function BASIC ROTATION cannot be used.
• PLC positioning (determined by the machine tool builder) is not
possible.