This paper describes a new approach for controlling an intelligent machining workstation. The control system is built in behavior achieving layers, which allows a machine tool to operate at increasing levels of competence. Each layer focuses on a specific simple control task for machining processes. Qualitative reasoning is used to augment the system at the highest layer, giving the system the ...

It is a very challenging task to develop effective process control methodologies for multi-operational manufacturing processes. Although Statistical Process Control (SPC) has been widely used as the primary method in the control of quality, it mainly serves as a change detection tool rather than a method to identify root causes of process changes. This paper proposes a systematic approach to ov...

The international thermonuclear experimental reactor (ITER) is a joint international research and development project that aims to demonstrate the scientific and technical feasibility of fusion power. The reactor tokomak (vacuum vessel) is made of stainless steel, and contains nine sectors welded together; each sector has about the size of 10 meter high and 6 meter wide. The sectors of ITER vac...

This paper presents a novel walking hybrid-kinematics robot that can be reconfigured to have three, five, and six degrees of freedom (DOFs) for adsorption machining large structures. A symmetric 3PRPR or 3PRRR parallel mechanism with three translational (3T) DOFs is used perform three-axis tasks. Three attachment pads connected passive spherical joints are attach the surface structure. Two rota...

The process of material removal from a workpiece to obtain the desired shape is termed machining. Present-day technologies have high spindle speeds and thus allow quick removal. These high-speed spindles are highly exposed vibrations and, as result, accuracy final workpiece’s dimensions compromised. To overcome this problem, motion tool restricted, multiple degrees freedom given through in diff...

The design of a novel prismatic drive is reported in this paper. This transmission is based on Slide-O-Cam, a cam mechanism with multiple rollers mounted on a common translating follower. The design of Slide-O-Cam was reported elsewhere. This drive thus provides pure-rolling motion, thereby reducing the friction of rack-and-pinions and linear drives. Such properties can be used to design new tr...

The growing interest in the use of parallel kinematic machines (PKM) in machining applications requires clear determination of the workspace, dexterity and stiffness. This paper deals with the issues regarding the use of PKM as micro machine tools. Comparison criteria are set and a quantitative analysis is made to compare the characteristics of serial and parallel kinematics with respect to the...

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