This standard is intended for use when the run-out accuracy of the moving parts of electron beam welding machines
complying with EN ISO 14744-1 is to be measured in connection with an acceptance inspection. It provides
information on the procedure and apparatus to be used for making the measurements. Given the great variety of
electron beam welding machines, the scope of measurements required for acceptance inspection purposes should be
specified separately for the machine concerned.
Run-out accuracy as defined here is a systematic error and thus counts as one of the parameters by which the
performance of a machine tool can be characterized. Other factors influencing performance (e.g. dynamic forces,
vacuum level, positioning accuracy of CNC machines) and methods of statistical evaluation are not covered in this
Electron beam welding involves movement of the workpiece and/or of the electron gun. Successful welding
presupposes that this movement is effected by the devices concerned (e.g. work table and rotating fixture) with a
given degree of accuracy. The purpose of the measurement is thus to check whether and to what extent the required
run-out accuracy is maintained.