scope:

Scope of application

It is the aim of this guideline to define specifications and testing methods for coordinate measuring machines. This ensures the comparability of the characteristics of coordinate measuring machines with tactile and with optical sensors.

The scope of application covers coordinate measuring machines of all designs with optical lateral sensors, that is, sensors measuring vertically with respect to the optical axis. If the corresponding additional devices are fitted the sensors can also be rotated or pivoted. Descriptions are provided about how the sensors work and special features they may have.

Based closely on DIN EN ISO 10360-2, the procedures for the acceptance test and for checking the length measurement deviation and the probing error with lateral sensors are defined. In its previous editions the DIN EN ISO 10360 series of standards was very markedly oriented towards tactile sensors. For that reason the present guideline provides the necessary additional material relating to the use of optical sensors:

• Measuring standards which can be used as an alternative to reference gauge blocks

• Comparability of characteristics when alternative standards are used (for example, with globular or cylindrical boundary surfaces or chrome-glass structures)

• Comparability of characteristics in the case of probing strategies which vary depending on the sensor (different number of points, degree of masking of the elements to be probed, use of additional devices such as rotation or pivoting devices)

• Definition of characteristics for different operating conditions

• Practical information on dealing with influencing factors such as environmental conditions, mathematical filters and the surface finish of the test pieces

Guidelines for the specification and checking of optical sensors have been drawn up by OSIS working groups (Optical Sensor Interface Standard). These are used when the sensor manufacturers and the manufacturers of the equipment in which the sensor is to be fitted are working together on system integration. These guidelines are not, however, used in the specification and checking of coordinate measuring machines when the two parties concerned are the manufacturer and the user.