HEIDENHAIN ND 287 User Manual - Manual (Page 41)

ND 287
41
I – 4 J
ob Set
up
Compensation using a reference part
Select the REFERENCE PART COMP. menu item to activate
temperature compensation using a reference part. Prerequisites:
 A temperature sensor is connected to encoder input X2.
 For the temperature sensor, you have set the ENCODER TYPE field
in the ENCODER SETUP menu to COMPENSATION and entered
the following encoder parameters, see "Setting up the encoder",
page 71:
 Calibration pair of values
 Correct thermal expansion coefficient
 Reference temperature
 The compensation value C is calculated as follows:
C = ND * E * (T - T_r)
 ND: Nominal dimension of reference part
 E: Expansion coefficient
 T: Temperature currently being measured
 T_r: Reference temperature
To activate the compensation:

In the JOB SETUP menu, select REFERENCE PART COMP. and
press the ENTER key to open the form.

Enter the known nominal dimension of the reference part in the
NOMINAL DIMENSION field.
 Press the ON/OFF soft key to activate the temperature
compensation using a reference part in the MEASURE REF. PART
field.
To measure the reference part:
 Press the MEASURE REF. PART soft key in the 3rd soft key row of
the standard screen. The ND 287 displays the current temperature
value on the left side of the message line, and the entered nominal
dimension of the reference part on the right side.
 Insert your reference part and press either the ZERO soft key or the
NOMINAL DIMENSION soft key, depending on whether you want
to display the test objects' deviations from zero or from the nominal
dimension.
Fig. I.34 Compensation using a reference part