This paper describes a remote controlled assembly using a haptic device. Most haptic devices have six Degrees Of Freedom (DOFs) for a higher sense of reality. However, for assembly operation, the simultaneous motion of parts with only one or two DOFs is required, and force feedback to operators is used only to maintain contact and detect collisions among parts. This leads to the possibility of assembly operations using a haptic device with a small number of DOFs. In this paper, we propose virtual planes to perform remote control of a 6DOF assembly by way of 1DOF user operations. Virtual planes separate the DOFs for user operation and for automatically generated motions that complement the user operation DOF in each assembly operation. A prototype system was developed with a 6DOF manipulator and camera. The system allows an operator to place virtual planes in any position and orientation using a camera image of the workspace. The experiment results showed the effectiveness of the method for remote controlled assembly without geometry information on the parts.
This paper describes the calculation of the point of contact between assembled parts for remotecontrolled assembly using a haptic device with a single degree of freedom (DOF). To achieve such remote-controlled assembly, it is necessary to judge the constraint state and change the movement direction of the part. It is difficult to detect the points of contact between parts around which the rotational movement should be performed. In this paper, we report a method developed for the purpose of determining the contact point using a six-axis force sensor without knowing the geometry of the parts. The proposed method is applicable to cases in which the theoretical contact point cannot be calculated because of errors and fluctuations in the sensory data. The effectiveness and precision of the method are evaluated through experiments and simulations.
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