MONITORING SYSTEM OF LOCUS OF CUTTING EDGE OF TOOL REST IN MACHINE TOOL

PURPOSE:To enable to reduce memory capacity, by setting up an allowable range to these sampling positions to a setting device by storing folding points for the sampling positions within each allowable range from a starting point to the terminal point. CONSTITUTION:At the time of machining of a model, an original position PO is stored in a memory circuit 4 as a point MO through a change-over circuit 5, a register 6 and a register 3 by a signal of a cutting edge detector 2, to begin with, when the PO becomes P1 it is stored in a register 8 through a change-over circuit 7, then a line connecting between the points P0 and P1, Pn and a distance D are obtained by a computing circuit 9, when it exceeds an allowable range by means of a setting device 10, for example, when it reaches a point P6, P5 is stored in the memory circuit 4 as M1 by turning a comparison control circuit 11 into H and then M2-M5 are stored similarly. At the time of practical machining when it becomes more than a set allowable range from a line between folding points, an alarming signal AR is applied from the comparison control circuit 11.