PURPOSE: To reduce time required for focusing work.

CONSTITUTION: When a data recording command signal 41 is input to a control device 57 by an operator's panel 35, position detection signals 51, 52,53,54, and 55 output from position detectors 30, 31, 32, 33, and 34 are recorded by a data recording device 50 as position data 56. When a blade section designation signal 42 is input to the controld device 57 by the operator's panel 35, a drive command signal 58 is input to a power supply device 44 based n the position data 56 which are recorded by a data recording device 50, traveling devices 25, 26, and 27, a rotation device 28, and an inclination device 29 are driven, a first traveling body 28, a second traveling body 11, and a third traveling body 14 travel in the directions of X, Y and Z axes, a rotator 15 rotates around A axis, and further a traveling body 17 inclines in reference to α axis.