Patent ID: 9423785
Filing Date: 2016-08-23
CPC Classification: G05B

Claim Text:
1. A tool trajectory display device for displaying a trajectory of a tool center point of a machine tool with a plurality of servo axes including at least one rotation axis controlled by a numerical controller, the tool trajectory display device comprising: a position information obtaining part which obtains position information of at least one servo axis of the plurality of servo axes, by using a position detector which measures the position of the at least one servo axis; a velocity information obtaining part which obtains velocity information of the at least one servo axis, by calculating the velocity information based on the position information obtained by the position information obtaining part or by using a velocity detector which measures a velocity of the at least one servo axis; a tool coordinate calculating part which calculates a coordinate value of the tool center point based on the position information of the at least one servo axis and information of a mechanical constitution of the machine tool; an inversion position calculating part which calculates a plurality of inversion positions based on the velocity information of the at least one servo axis and the coordinate value of the tool center point, the plurality of inversion positions including a displaying part which wherein the plurality of servo axes includes a gravity axis, and the displaying part displays the first and second inversion positions by using different display attributes, respectively, to indicate whether a moving direction of the gravity axis is changed from upward to downward or from downward to upward, for evaluating an effect of gravity on a shape error of a workpiece to be processed by the machine tool.