If a value is measured that is less distant than the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ring the accuracy of CMMs requires the application of calibrated artifacts, normally ball plates, hole plates and step gages as defined in given standards (e.g. ISO 10360) or guidelines (e.g. VDI/VDE 2617). CMMs with a large measuring volume, such as typical horizontal arm CMMs, have to be checked with ball bars. For all artifacts special expensive fixtures, CNC routines, evaluation programs and training courses for the operators are necessary. Both time consuming positioning and fixing routines for each measurement and the purchase of standardized artifacts is quite expensive. Furthermore, the measurement of artifacts interrupts the regular operation on the CMM. In contrast to these disadvantages of the regular procedure of acceptance tests and reverification tests the application of the substitution method offers an economical procedure to monitor CMMs in practice, but calibrated series parts are required. These parts can be selected from the mostly measured series workpieces. For the calibration routine the same measu...
View Full Document

This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

Ask a homework question - tutors are online