Provided is a correction data checking system, for robots, which makes it
easy to reveal the cause of a machining defect. A laser machining head
and a distance sensor or a sensor for detecting a work line are attached
to the distal end of a robot arm. A robot is driven based on a teaching
program, and a copying control technique is implemented based on
information sent from the sensor so that the distance between the laser
machining head and a workpiece will be equal to a set value. A path of
taught positions of the laser machining head and a path of actual
positions thereof are displayed in comparison with each other on a
display of a teaching console or the like. Moreover, the difference
between the taught position and actual position is calculated and
displayed. As both the position commanded by the teaching program and the
actual position derived from the copying control technique are displayed,
if a machining defect occurs, the machining defect is checked to see if
it is a problem attributable to the sensor or a problem attributable to
the workpiece or a jig. The cause of the machining defect is then
revealed. Consequently, the cause of a machining defect can be quickly
revealed and dealt with at a working site.
