PURPOSE: To improve machining accuracy of a machine tool, by detecting a relative amount of change, between a spindle unit and reference scale, with a displacement meter and correcting the feed amount of a cutter on the basis of the displacemnt.
CONSTITUTION: The lower end of a reference scale 16 is fixed to a spindle unit 5, simultaneously the upper end, the free end, is adapted to a detecting part of a displacement meter 17 fixed to the spindle unit 5. A guide frame 15, guiding the reference scale 16, is provided throughout total length of the reference scale 16. To read the displacement in the displacement meter 17, an adjustment window 18 is provided in a saddle 1 toward the displacement meter 17 fixed to the unit 5, and a transparent cover 19 is mounted to the outside of the window 18. The displacement, relatively generated between the reference scale 16 and the spindle unit 5, is detected by the displacement meter 17 to correct the feed amount of a cutter 14 in accordance with the displacement.
MATSUMOTO TERUYUKI
SHIMAZUTSU HIROAKI
FURUKAWA TAKEO
