Modifikasi Manipulator Tipe Silinder Untuk Robot Pemanen Buah Dalam Greenhouse

Abstract

The harvesting robot need to be design so it has capacity to harvest the fruits or vegetables selectively. The selective harvesting means only harvest the ripe fruit while the non ripe fruit still remined on the tree. The manipulator is one of the robot parts that has an important function for successful of the robot task. The problem of the previous manipulator is that horizontal prismatic joint disturb the oposite plant of target. This disturbance make alignment error of the manipulator. Miss alignment of the manipulator from target will cause the harvesting failure because of the end-effector tip can not reach the fruit. Purpose of this research was to modify the horizontal prismatic joint into the horizontal rotational joint. Therefore the modified manipulator has three degree of freedom that is consisted of two rotational joint and one prismatic joint. Result of the research show that the positioning error of the x coordinate is 13.8 mm, y coordinate is 15.1 mm, z coordinate is 3.2 mm. The positioning error of the x coordinate and y coordinate was caused by inertia force of the rotational joint. The positioning accuracy of the z coordinate was caused by time response of the program more slow than encoder pulse frecuency of the vertical translational joint. Therefore in this research motion distance was measured using timer. For better result the measurement method of each joints need to be change from incremental encoder into absolute encoder.