Virtual Tool Axis; Tilting Functions With Open-Loop Rotary Axes; Inclined Milling With Open-Loop Rotary Axes (Counter Axes) - HEIDENHAIN iTNC 530 HSCI Technical Manual

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6.5.8 Virtual tool axis

Inclined milling

with open-loop

(counter axes)

When moving the axes in the manual operating modes, and when re-

approaching the contour after a program interruption, you can select via the 3D

ROT and TOOL AXIS soft keys the coordinate system of the tool. The axes can

be moved in the current tool axis direction even before traversing the

reference marks. To accomplish this, the last position of the rotary axes before

power-off is stored in non-volatile memory for incremental encoders. These

non-volatile axis values are shown in a pop-up window when the control is

started, and must be acknowledged by the machine operator with ENT

(confirmation of the values) or NO ENT (values deviate, reference run must be

performed first).

With the iTNC 530, handwheel superimposed traverse in the active tool axis

system "Virtual Tool Axis VT" is possible when TCPM is active , see page 772.

Virtual tool axis – Reapproaching the contour and manual

traverse in the current tool-axis direction

Machines with rotary axes that only have open-loop axes (counter axes,

MP120.x = 0, are not controlled) can be used for inclined milling. The following

procedure is necessary:

With M128 inactive (TCPM: the position of the tool tip remains constant

when positioning tilting axes), the machine operator sets the rotary axes to

the required nominal values.

When M128 is activated, the control assumes the actual values of the non-

controlled rotary axes, and uses them to calculate the changed position on

the tool center point (TCP).

The display of axes X/Y/Z is updated with the newly calculated values, and

the compensating movement is performed with the next positioning.

As long as M128 is active, the positions of the non-controlled rotary axes are

monitored. If the positions of these axes deviate by more than the values

defined in MP1110.x (standstill monitoring), then an error message is output

and the momentary machining is interrupted.

This function is even permitted after a program interruption with the MANUAL

TRAVERSE soft key. In this case the new compensating movement is

determined after switching with the APPROACH POSITION soft key.

HEIDENHAIN Technical Manual iTNC 530 HSCI