Patent ID: 9506745
Filing Date: 2016-11-29
CPC Classification: B23Q,G01B,G05B

Claim Text:
1. A method of measuring an error in relative positioning between a spindle and a table along linear feed axes of a multi feed axis machine tool having at least two rotational feed axes as well as three orthogonal linear feed axes, i.e., X-, Y- and Z-axes, for changing the relative position between the spindle and the table, the method comprising the steps of: attaching at least first to third reflector mirrors to a table of the machine tool; attaching a laser length measuring device, adapted to emit a laser beam for measuring a length, to an end of a spindle of the machine tool; for a specific one of the reflector mirrors, repeating the moving and the orienting of the laser length measuring device for each of the first to third reflector mirrors; only after the repeating of the moving and the orienting of the laser length measuring device for each of the first to third reflector mirrors, the coordinates of the respective measuring points are calculated, based on the obtained optical data, along the three orthogonal X-, Y- and Z-axes; and comparing the machine coordinates of the machine tool at the measuring points, specified in the position commands, with the calculated coordinates of the measuring points whereby the errors in the relative positioning between the spindle and the table along the X-, Y- and Z-linear feed axes of the machine tool are obtained.