NCT Group NCT 990T - Manual (Page 81)

7.2.4 Calibrating Tool Offset Sensor
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7.2.4 Calibrating Tool Offset Sensor
The tool offset sensor calibration means the definition and storage of button positions at para-
meters CONTACT. The sensor can be calibrated in two ways.
The first possibility is that the button positions of the sensor are defined in a coordinate system
set by the user, e.g., a coordinate system fixed to the chuck. In this case the values of tool
length offsets contain the zero point offset according to the reference point.
The other possibility is that the button positions of the sensor are defined according to the
reference point. In this case the tool length offset value equals to the tool overhang.
Warning!
Parameters 8081 CONTACTX+ and 8082 CONTACTX– must always be specified in radius
independent of the default interpretation being in diameter or radius in the control. All
CONTACT parameters must be defined in the double of output increment system, i.e. for
example in case of metric machine and INCRSYSTB=1 it is in
: m without decimal point.
Before the start of the calibration clear all tool length offsets, work zero point offsets as well
as all CONTACT parameters.