Numerical controller

A numerical controller for controlling a machine tool wherein a control operation thereof is changed according to a dimension of a workpiece which is output from a measuring unit, said numerical controller comprising:

• data input means for receiving a measured analog data value obtained from said measuring unit when a masterpiece is measured by said measuring unit and for converting said measured analog data value into a proportional measured digital data value;
• sampling interval storage means for storing a sampling interval time;
• sampling means for sampling said measured digital data value output by said data input means at a sampling interval determined by said sampling interval time stored in said sampling interval storage means when the masterpiece is measured by said measuring unit;
• basic value input means for inputting a basic value indicating an absolute dimension of the masterpiece;
• tolerance value input means for inputting a tolerance value which indicates a tolerable value of a deviation from said basic value;
• tolerance value storage means for storing the tolerance value input by said tolerance value input means;
• calculating means for calculating an upper limit by adding the tolerance value to the basic value and for calculating a lower limit by subtracting the tolerance value from the basic value;
• and
• data displaying means for displaying plural measured data values sampled by said sampling means with the basic value, the lower limit and the upper limit.

A numerical controller apparatus, wherein a control operation of the numerical controller is changed according to a measured diameter of a workpiece at a plurality of changeover points during a continuous machining operation, comprising:

• means for controlling operation of said numerical controller;
• means for measuring said diameter of the workpiece having a pair of contact elements continuously in contact with opposite sides of the workpiece;
• means for storing predetermined target data values which represent desired target diameters of the workpiece corresponding to said plurality of changeover points during said continuous machining operation;
• means for comparing said measured diameter of the workpiece with a selected one of said predetermined target data values, and outputting a signal to said means for controlling operation of said numerical controller upon coincidence of the measured diameter and said selected one of said predetermined target data values, to thereby control the operation of the numerical controller.

A numerical controller for controlling a machine tool wherein a control operation thereof is changed according to a dimension of a workpiece which is output from a measuring unit, said numerical controller comprising:

• reference sizing point storage means for storing a data value of a reference sizing point indicating a dimension of said workpiece at which said control operation is changed;
• reference sizing point read out means for reading out the data value of said reference sizing point;
• data input means for receiving an analog data value obtained from said measuring unit when said workpiece is measured by said measuring unit and for converting said analog data value into a corresponding digital data value;
• master data storage means for storing a master data value which is input through said data input means when a masterpiece is measured by said measuring unit and which represents an absolute dimension of said masterpiece;
• difference value calculating means for calculating a difference value between said master data and the measured absolute dimension of the masterpiece;
• compensating means for compensating said digital data value with said calculated difference value;
• data evaluating means for evaluating said compensated digital data value with the data value of said reference sizing point which is read out by said reference sizing point read out means;
• sizing signal generating means for generating a sizing signal upon coincidence of said compensated digital data value with the data value of said reference sizing signal;
• and
• control means for changing said control operation of said numerical controller in response to said sizing signal generated by said sizing signal generating means.

A numerical controller having a memory means and a central processing unit (CPU) for numerically controlling a machine tool in accordance with numerical control data and in response to a signal from a measuring unit which measures the diameter of a workpiece, wherein:

• said memory means stores a data value of a reference sizing point indicating a diameter of said reference sizing point;
• said numerical controller further includes data input means for receiving an analog data value obtained from said measuring unit and for converting said analog data value into a corresponding digital data value;
• and wherein
• said central processing unit includes reference sizing point reading out means for reading out said data value of said reference sizing point, sizing signal generating means for comparing said digital data value provided by said data input means with said data value indicating said reference sizing point which is read out by said reference sizing point reading out means for generating a sizing signal upon coincidence of said digital data value with said data value indicating said reference sizing point, and control means for changing said control operation of said numerical controller in response to said sizing signal generated by said sizing signal generating means.