HEIDENHAIN TNC 426 PB/M Technical Manual page 678

Table of Contents

Before the probing process is started, the NC sets M4055. Before executing

the function, the NC waits until you reset M4055. This allows you to take a

break, for example to clean the measured object before starting the probing

M4051 is set if the stylus is deflected before the probe block has been started.

If it is, the probing block start is delayed by 1 second

The NC takes over control of the probing process. Certain conditions are

indicated in M4050 to M4054.

If you set M4056, the NC stops the machine in all operating modes as soon as

the stylus is deflected. The maximum feed rate is limited to the value specified

in MP6150 or MP6361. If M4056 is set and the infrared touch probe does not

provide a ready signal, the feed-rate enabling is reset.

If you do not set M4056, the control detects a deflection of the stylus only if

the probing function has been started.

HEIDENHAIN recommends:

Set M4056 as soon as the touch probe is in the spindle.

Specify with MP7411 bit 0 whether a probing block is to use the tool data

(length, radius, axis) from the last TOOL CALL block or from the calibrated

data of the touch probe. If MP7411 = 1, you can use soft keys to take the

effective length and effective radius over into the tool table.

In the operating modes MANUAL and ELECTRONIC HANDWHEEL, enter

the tool number in the menu for touch probe calibration.

The TNC can save the calibration data for up to three touch probes at once:

Set MP7490 bit 2.

Use the traverse range switching function to activate the current data with

M4574/M4575.

If you are using a horizontal/vertical swivel head, the compensation values of

the touch probe must be accounted for in different axes:

With Module 9153, switch the touch probe axis in order to correctly account

for the compensation values.

As of NC software 280 476-01, several blocks of touch probe data can be

managed through the tool table. Use the tool table columns CAL-OF1 (touch

probe center offset in the reference axis), CAL-OF2 (touch probe center offset

in the minor axis) and CAL-ANG (spindle angle when calibrating). In the

standard setting, these columns are hidden. They can be shown, however,

with MP7266.28, MP7266.29 and MP7266.30. The current touch probe

calibration data can be viewed and edited in the calibration menu for manual

measurement:

With MP7411 bit 1, activate the probe calibration management function in

the tool table. If bit 1 = 1, bit 1 has no function.

HEIDENHAIN Technical Manual TNC 426, TNC 430