METHOD OF CONTROLLING ROBOT ARM

[SUMMARY] [OBJECT] Provide a method for controlling a robot arm which retrains the vibration of the arm during a switch of operating method from teaching play back control to feedback control. [SOLUTION] Operate robot arm by the control method comprising the following steps and the vibration of the robot arm is restrained at the time of the control change, by using a non-contact type impedance control method; A step to move a robot arm along a course decided beforehand, the step is performed with teaching play hack control, the teaching play back control is carried out by the instruction of a program which is stored in the control department of a control unit. A step to recognize the presence or absence of the work by a work recognition means which is provided to the arm. A step to move the robot arm to follow the work changing the program of the control department at the same time to recognize the work, the program is changed to feedback control of the non-contact type impedance control method from teaching play back control.