METHOD FOR COMPENSATING SQUARENESS ERRORS IN NC MACHINE TOOL

摘要

PURPOSE:To compensate for errors in squareness in an NC apparatus, by computing distance errors in the directions other than the reference direction and those in the reference direction and giving driving commands to respective servo mechanisms for the compensation based on the computed errors. CONSTITUTION:The CPU2 in an NC apparatus measures errors in squareness of the Y and Z axes, DELTAXy and DELTAXz, with the guideway in the X axis taken as the reference axis, and the measured errors are stored in the memory 3. Then, distance errors in the X direction of the driven distances in the Y and Z axes are computed from the driven distances in the Y and Z axis and the squareness errors. The distance errors with a minus sign attached, the command for driving the servo mechanism 4 in the X axis, the distance errors in the Y and X axes of the driven distances along the Y and Z axes computed from the earlier mentioned distance errors and the squareness errors, and the commands for driving the servo mechanisms 5, 6 along the Y or Z axes are input to the NC apparatus, whereby the NC apparatus issues commands for compensating the distance errors and the compensation for the errors in squareness can thus be achieved.