METHOD OF TRUING UP HEAVY WORKPIECES ON THE TABLE OF A METAL-CUTTING MACHINE AND SUCH TABLE FOR CARRYING SAID METHOD INTO EFFECT

摘要

The table together with the workpiece is imparted vertical motion in such a manner that its bearing points lying at the vertices of an imaginary parallelogram, move equal distances only in pairs constituted by the adjacent bearing points. To this end the bed of the table has four bearing members located at the vertices of an imaginary parallelogram and adapted for vertically changing the position of any pair of the adjacent bearing members with respect to the bed, with the result that the workpiece together with the table is set spatially true with respect to the machine operative unit.