PURPOSE: To simply and accurately measure numeric value data of an attachment to be replaced by performing comparison operation on dimensions and shapes of respective parts in a prescribed posture of the attachment to be replaced with a numeric value being a reference.

CONSTITUTION: In a construction machine capable of replacing a bucket attachment 3, three shape parameter values of a wrist radius L3, a blade tip angle () and a land cell angle () being a reference in a prescribed measuting posture of the bucket 3 having various shapes and sizes, are prestored in a data memory 21 of a controller. When the bucket 3 is replaced, a replaced bucket 3 is put in a measuring posture, and numeric value data measured by an arm angle sensor 4, an arm angle sensor 5, and a bucket angle sensor 6 are inputted to the controller 20, and operation is performed on numeric value data on a difference from a reference numeric value and a dimension and a shape of the replaced bucket 3, and they are registered. This numeric value data is used for locus operation at automatic excavation time thereafter or positional calculation of the bucket 3 at interference preventing time.

COPYRIGHT: (C)1995,JPO