TAILIEUCHUNG - Crc Press - Mechanical Engineering Handbook - Robotics 1 Part 12

Tham khảo tài liệu 'crc press - mechanical engineering handbook - robotics 1 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 14-110 Section 14 need for a tool guide it is stiff enough to track the part precisely while withstanding the router cutting reactions. The cost of this contouring capability as compared to a standard five- or six-axis routing machine would be much lower. The Stewart platform would be superior to any serial link robot as a drilling head manipulator. Virtually all applications of drilling robots in aerospace manufacturing require the use of expensive and complex end effectors of part jigs to compensate for the inaccuracy and lack of stiffness of the robots. Drilling jigs for some parts can cost as much as ten times more than the robot itself. Special end effectors are often used to apply preloads to prevent the drill from walking and chattering. The Stewart platform could perform many drilling tasks unaided by special tooling because of its stiffness and precision. The industrial robot has generally not been considered to be a good milling manipulator. The Stewart platform could potentially perform contour milling of some materials with near-machine-tool accuracy. A Stewart platform milling machine with stiffness and dexterity characteristics intermediate between a large serial link robot and a five-axis mill could be built at or below the cost of a commercial serial link robot. A Stewart platform milling machine successfully used for industrial applications is shown in Figure . When a direct contact tool like a grinder is used it is important to control both the tool position and the forces involved so that the substrate is not damaged. For example when grinding mold scale a very aggressive tool may be needed and the normal force applied can be as large as 40 to 50 lbs so long as the penetration into the surface is precisely controlled. The reactions in the surface tangent plane can be very large and could cause oscillations if not held rigidly. A Stewart platform with a constant force suspension for its tool could apply very large force with very high .

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