Patent ID: 6732009
Filing Date: 2004-05-04
Classification: G05B

Abstract:
A machining error correction method for correcting an error in machining of a work by a tool, the method being adapted for a machine tool that includes: a numerical control unit in which a movement amount of the tool is programmed; and a tool moving unit that is driven by an instruction signal sent from the numerical control unit and feeds the tool to the work fixed on a work table, the method comprising: moving the tool in two different directions in a single plane from a program origin to a measurement point provided separately from the program origin by giving a predetermined measurement movement amount to the tool moving unit from the numerical control unit; measuring a positional deviation amount between the measurement point and a tool position after the movement is finished; and correcting a machining movement amount, which is to be given to the tool moving unit, using the positional deviation amount when the work is machined;wherein the machine tool is constructed as a grinding machine in which the tool is a grindstone and includes a dresser for modifying a shape of the grindstone, and wherein when dressing of the grindstone is performed, the numerical control unit corrects a dress movement amount given to the tool moving unit using the positional deviation amount.