Design, Fabrication and Control of a New Type of The Omnidirectional Spherical Wrist

Authors

Faculty of mechanical engineering, shahrood university of technology

Abstract

In this paper, a new type of spherical wrist is investigated. By using CAD/CAM software, simulation and analysis have been done. So, a new type of mechanism has been fabricated by involute axes in the form of conical gears that can create an unlimited revolution for the wrist without singularity. This wrist has the special ability due to its structure and mechanism to use robots for high precision applications and continuous movements without singularity. According to the drawings, the manufacturing of the model for molding and casting of pieces is carried out and then by machining, the dimensions of the parts are achieved to the standard of drawing. After the assembly, the mechanical work pieces are prepared. The direct and inverse kinematics of the involute angles are obtained for the directions of the wrist. Also, according to the kinematics of the robot, the position of the end-effector is calculated. At first, Matlab software is used to simulate the wrist model and also the experimental test is done for validation. At the end, the PD controller is designed to control the yaw, roll and pitch angles and the changes necessary to improve the wrist control have been applied in the controller and AVR-based microcontrollers. Finally, simulation results are verified through theoretical and experimental test.

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References

[1] Duchemin G, Dombre E, Pierrot F (2000) SCALPP: A 6-DOF robot with a non-spherical wrist for surgical applications. Advances in Robot Kinematics PP: 165-174.
 [2] Gupta KC (1986) Rotatability considerations for spherical four-bar linkages with applications to robot wrist design. ASME J Mech Transm Autom Des 108(3): 387-391.
[3]  Lee KM, Vachtsevanos G, Kwan CH (1988)  Development of a spherical stepper wrist motor. J Intell Rob Syst Theor Appl 1(3): 225-242.
[4]  Trabia M, Davidson JK (1989) Design conditions for the orientation and attitude of a robot tool carried by a 3-R spherical wrist. ASME J Mech Transm Autom Des 111(2): 176-187.
[5] Gregorio RD (2000) Kinematics of a new spherical parallel manipulator with three equal legs: The 3-URC wrist. J Rob Syst 18(5): 213-219.
[6]  Gregorio RD, Castelli VP (1998) A Translational 3-DOF Parallel Manipulator. Advances in Robot Kinematics PP: 49-58.
[7]  Wang J, Liu X (2003) Analysis of a novel cylindrical 3-DoF parallel robot. Rob Autom Syst 42(1): 31-46.
[8]  Carricato M, Castelli VP (2004) A novel fully decoupled two-degrees-of-freedom parallel wrist. Int J Robotics Res 23(6): 661-667.
[9]  Fang Y, Tsai L (2004) Structure synthesis of a class of 3-DOF rotational parallel manipulators. IEEE Trans Rob Autom 20(1): 117-121.
[10] Kong X, Gosselin CM (2004) Type synthesis of 3-DOF spherical parallel manipulators based on screw theory. J Mech Des, Trans ASME 126(1): 101-108.
[11] Chablat D, Wenger PH (2005) Design of a spherical wrist with parallel architecture: Application to vertebrae of an eel robot. IEEE International Conference on Robotics and Automation.
[12] Vischer P, Clavel R (2016) Argos: A novel 3-DoF parallel wrist mechanism. Int J Robotics Res 19(1): 5-11.
[13] Humen J (1974) Floating chamber machine, US Patent. No. 3973469.
[14] Wells WM (1976) Multi-directional positioner, US. Patent. No. 4045958.
[15] Kimura K, Sato S (1984) Wrist mechanism for industrial robot, US. Patent. No. 4574655.
[16] Rosheim ME (1986) Compact robot wrist acuator,  US. Patent. No. 4686866.
[17] Stackhouse TH (1976)  Manipulator, US. Patent. No. 4068536.
[18] Fletcher JC, Administrator KL (1976) Wrist joint assembly, US. Patent. No. 4068763.
[19] Asada H, Granito JAC (1985) Kinematic and static characterization of wrist joints and their optimal design. Proceedings IEEE International Conference on Robotics and Automation 2: 244-250.
[20] Campa R, Camarillo K, Arias L (2006) Kinematic modeling and control of robot manipulators via unit quaternions: Application to a spherical wrist. IEEE Conference on Decision & Control.
[21] Karami M, Tavakolpour Saleh A, Norouzi A (2017) Modeling, development, and evaluation of a micro-robot equipped with vibratory actuator. Modares Mechanical Engineering 17(8): 413-422.
[22] Abdollahi Khosroshahi H, Badamchizadeh M (2018) Design and Implementation of a new mechanism for the planar robotic arm. Modares Mechanical Engineering 18(5): 341-351.
Journal of Solid and Fluid Mechanics
Volume 8, Issue 2
July 2018
Pages 1-11

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