8 – 90 HEIDENHAIN Service Manual iTNC 530 HSCI
Consideration of
tool length
If the position display is set to ACTUAL, the operator can see the position of the tool tip.
The tool length is not taken into account in the log!
The ACTUAL value in the log for the tool axis minus the tool length is the ACTUAL value displayed on
the monitor of the control.
In this example:
+161.0133 - 50.0000 = +111.0133 (displayed ACTUAL position of the tool axis Z)
Figure:The tool (50 mm long) is taken into account in the ACTL display (the tool tip is displayed),
whereas it is not in the REF display and in the log.
Calculation of
REF position
Service engineers are not so much interested in the ACTUAL values at the time of the program
termination, but in the REF values which represent the positions with reference to the machine datum.
To calculate these REF values, the offset values (Preset) recorded in the log are subtracted from the
ACTUAL positions (Actual pos.).
In this example:
Actual pos. Preset REF position Axis
171.1153 - (-5.0000) = 176.1153 X axis
115.3504 - (-20.0000) = 135.3504 Y axis
161.0133 - 450.0000 = -288.9867 Z axis
322.2375 - -59.4970 = (381.7345 - 360 =) 21.7345 B axis
24.8189 - -8.8153 = 33.6342 C axis
Here, 360° must be deducted from the calculated value for the rotary axis B in order to get
the correct REF position.
The REF position of the tool axis Z calculated in the example (- 288,9867) is also displayed
on the control monitor in the REF position display setting.
This display always refers to the datum of the tool holder.
To determine the REF position of the tool tip, the tool length needs to be subtracted
(-288.9867 - 50.0000 = - 338.9867).
To Next Page
Loading...
