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AssigneeIkegai Tekko Kabushiki Kaisha
InventorTamotsu Yamamoto
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In an automatic measuring apparatus and method for a numerically controlled machine tool, the dimension of a stylus secured to a cross slide and a desired dimension between two opposite points on a workpiece to be measured are inputted into an automatic measuring device in advance, the cross slide is moved under numerical control to bring the stylus into contact with the two points and to remove the stylus therefrom, and measurement of the amount of movement of the cross slide is started when the stylus leaves from one of the two points and the measurement is ended when the stylus leaves from the other point. The measurement value thus obtained, the dimension of the stylus and the desired dimension are subjected to addition and subtraction, thereby to automatically measure the actual dimension between the two points, and the difference between this actual dimension and the desired dimension.
In an automatic measuring and tool position compensating method for a numerically controlled machine tool comprising the steps of putting the dimension of a stylus secured to a stylus head and a desired dimension of a workpiece to be machined into a count control circuit, moving said stylus under numerical control to bring said stylus alternately into contact with two opposite points on a workpiece to be measured, and measuring an amount of movement of said stylus head effected for a period of time between an instant when said stylus leaves from one of said two points on said workpiece and an instant when said stylus leaves from the other point of said workpiece by counting a train of pulses for measurement generated in a digital type measuring device to provide a measurement value, the improvement comprising additionally inputting said measurement value into said count control circuit for effecting the measurement of an actual dimension, the amount of deviation of the workpiece and the required compensation of the tip position of the relevant tool through a process of addition and substraction.
In an automatic measuring device for a numerically controlled machine tool, which comprises a stylus head mounted on a moving table of said numerically controlled machine tool and having a stylus adapted to come in contact with a workpiece to be measured and to leave therefrom, a digital type measuring device for generating a train of pulses for measurement in correspondence to an amount of movement of said stylus, a detection signal generating circuit for selectively generating a measurement start signal and a measurement stop signal when said stylus leaves from said workpiece, and a control circuit connected with said digital type measuring device for causing said digital type measuring device to start delivering said train of pulses for measurement upon receiving said measurement start signal and for causing said digital type measuring device to stop delivering said train of pulses for measurement upon receiving said measurement stop signal, the improvement comprising a counter capable of receiving the dimension of said stylus and a desired dimension of said workpiece through said control circuit as well as being operative to count said train of pulses delivered to said control circuit so as to provide a count value modified by the dimension of said stylus along with the desired dimension through addition and subtraction.
Dependencies are inferred from the claim text.