The Material coefficient boxes contain numbers that reflect the material property. They are the fractional change in length per unit change in temperature.
The values vary depending on what type of material was used to make the scales on the machine axes and on the part's material.
The units are meter per degree C.
A scale with a coefficient of 11.5 microns is written as 0.0000115 Meters/Degree/C.
Acceptable Part Values on Leitz Machines
If you are using a Leitz machine, PC-DMIS forces you to use an acceptable material coefficient value in the Part box. An acceptable value lies within the range of -0.001 through 0.001 Meters/Degrees/Celsius.
If you enter a value outside of this acceptable range in the Temperature Compensation Setup dialog box, a warning message appears, and the value in the Part box is reset to 0.0.
If you open a measurement routine created from an older version of PC-DMIS that permitted unacceptable values, a message box now informs you of the unexpected material coefficient value, and PC-DMIS resets the value to 0.0.
If you attempt to manually edit the TEMPCOMP/ORIGIN command to use an unacceptable value, PC-DMIS displays an error message in the Execution dialog box during execution. The message informs you that the part material coefficient value is out of range. The only option is to click Cancel, and modify the command to contain an acceptable value.