Error Compensation

PC-DMIS supports the following software error compensation methods for this interface:

Direct Error Comp from MP Unit

This is the simplest form of compensation and requires that the machine is an 'MEA' type (usually signified by red trim on the machine and MP unit) and that its calibration date has not expired. PC-DMIS reads hit values directly from the MP unit. MPHits=1 must be set in the PC-DMIS Settings Editor for this option to work.

PC-DMIS supports the capability for non-linear error compensation of the rotary table for the above options. That is, it will adjust for scale errors. Refer to the section "Volumetric Compensation" for information on other compensation methodologies and settings.

In order to make use of this capability, you will need to have your rotary table CMM "shot" with a laser, alternatively if the MP unit is within its calibration dates you can use the MP W axis values as the true ‘beamed’ values. All values must be collected from the HOME position of the rotary table.

The following commands should be entered into a file called COMP.ERR. This file should be in the PC-DMIS directory. Commands should be entered in upper case:

STARTW

This command specifies the beginning of the W axis data. This should be the data connected to the W counter port.

All data within a data block should be specified in the following format:

scale reading=laser reading

END

This command specifies the end of an axis data block for W.

Example File:

STARTW

0.0=0.0

10.0=10.002

30.001=30.023

40.002=40.01

END