A new concept of continuous measurement and error correction in Coordinate Measuring Technique using a PC

• The period between the reverification test and the interim checks is excessively long.
• The proposed solution is consisting of: mapping error, updated CAA matrix and sending data to the Certification Centre.
• Verification of the method was conducted using with the PS-20+ electronic module.

This article presents a new method of daily accuracy measurement with the employment of a Coordinate Measuring Machine (CMM) based on the mapping error procedure and the reduction of the error level through automatic corrections saved onto the matrix of CAA (Computer Aided Accuracy). Currently, measurements conducted using the Coordinate Measuring Machine do not guarantee credible and accurate results, owing to the fluctuation of CMM parameters over time as a consequence of its considerable dynamics of functioning. It would appear that the period in between the reverification test and interim checks is excessively long in the case of CMM. Automatic corrections saved onto the matrix of CAA are only optimal for the particular day on which those measuring procedures were conducted and there is no guarantee whatsoever that the above-mentioned corrections would be optimal for every single measurement conducted over time. For the purpose of establishing whether repeatedly performed measurements conducted in the same conditions would also retain the same value over time, four measurements were carried out, consisting in the verification of results of establishing the effective radius of the stylus tip over the course of ten consecutive working days. Those tests were conducted with the use of two CMMs (Kemco 600 CNC and Dea Global Image Clima (simplified test)) at five measurement speeds (5–50 mm/s). The results were presented of unadjusted and adjusted stylus/probing system qualification procedures. The procedure suggested and then tested in practice was based on the analysis of results in an external and independent Certification Centre. In addition, a practical test of the integration of the PS-20plus electronic module and a commercial measuring probe (Bipropol) was conducted.