beautypg.com

4 special cy cles – HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles User Manual

Page 119

background image

HEIDENHAIN TNC 426, TNC 430

107

3.4 Special Cy

cles

U

U

U

U

Direction: 0=Calibrate, 1=Measuring?

: Definition of

whether you want to calibrate or make a control
measurement:
0: Calibrate
1: Measure

U

U

U

U

Probing directions

: definition of probing direction(s)

in the working plane:
0: Measuring only in the positive direction of the
reference axis
1: Measuring only in the positive direction of the
minor axis
2: Measuring only in the negative direction of the
reference axis
3: Measuring only in the negative direction of the
minor axis
4: Measuring in the positive directions of the
reference axis and the minor axis
5: Measuring in the positive direction of the reference
axis and in the negative direction of the minor axis
6: Measuring in the negative direction of the
reference axis and in the positive direction of the
minor axis
7: Measuring in the negative directions of the
reference axis and the minor axis

U

U

U

U

Setup clearance

(incremental): additional distance

between measuring point and probe contact. Q320 is
added to MP6540.

U

U

U

U

Clearance height

(absolute): coordinate in the touch

probe axis at which no collision between tool and
workpiece (fixtures) can occur (referenced to the
active datum).

Before programming, note the following:

Before you perform a measurement, you must have made
at least one calibration, otherwise the TNC will output an
error message. If you are working with several traverse
ranges, you have to make a calibration for each of them.

Each time you run cycle 440, the TNC resets the result
parameters Q185 to Q187.

If you want to set a limit for the axis shift in the machine
axes, enter the desired limits in the tool table TOOL.T
under LTOL for the spindle axis and under RTOL for the
working plane. If the limits are exceeded, the TNC outputs
a corresponding error message after the control
measurement.

After the cycle is completed, the TNC restores the spindle
settings that were active before the cycle (M3/M4).

Example: NC blocks

5 TCH PROBE 440 MEASURE AXIS SHIFT

Q363=1 ;DIRECTION

Q364=0 ;PROBING DIRECTIONS

Q320=2 ;SET-UP CLEARANCE

Q260=+50 ;CLEARANCE HEIGHT

The TNC calculates incorrect values if the probing
direction(s) for calibrating and measuring do not
correspond.