
B-63943EN-1/02 16.MEASUREMENT
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NOTE
NOTE
1 If an H code and G37 are specified in the same block, an alarm will be
raised. Specify an H code before a block including G37.
2 A measurement speed (FP), γ, and ε are specified as parameters (FP:
No.6241, γ: No.6251, ε: No.6254) by the machine tool builder. As ε, specify
a positive value satisfying the condition of γ > ε.
3 The compensation value is updated by the following formula:
New compensation value =(Current compensation value)+[(Current position
of the tool along the specified axis when the measuring position reached
signal is "1") - (specified measuring position)]
The following compensation values are updated:
(1) In a M series, the compensation value corresponding to the tool
compensation number selected by an H code.
When offset memory A is used, the offset value is changed.
When offset memory B is used, the tool wear compensation value is
changed.
When offset memory C is used, the tool wear compensation value for
the H code is changed.
(2) In a T series, the compensation value corresponding to the tool
compensation number selected by a T code and to the specified axis
(X, Z) in G36, G37.
4 A delay or variation in detecting a measuring position reached signal is 0 to 2
ms just on the CNC side, excluding the PMC side. Accordingly, the
measurement error is the sum of 2 ms and a delay or variation in transferring
a measuring position reached signal on the PMC side (including receiver
delay or variation), multiplied by the feedrate specified in parameter
No.6241.
5 A delay or variation after the detection of a measuring position reached
signal until feed stop is 0 to 8 ms. When an overshoot is calculated, an
acceleration/deceleration delay, servo delay, PMC delay must also be
considered.
6 A measuring position reached signal is monitored just as a state not by the
rising edge. Accordingly, if a measuring position reached signal is held to 1
and if the corresponding tool length measurement function (G37) is
specified, the CNC will raise alarm PS0080 when a movement is made to a
position at a distance of γ, in front of the measuring position.
7 When using this function, set the parameter EVO (bit 6 of parameter
No.5001) to zero. (If the tool compensation value of tool length
compensation A or B is changed in the offset mode (G43 or G44), the new
value becomes effective from a subsequent block including G43, G44, or an
H code.)