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The inaccuracy of CNC machining may come from several factors, such as machine vibration, dynamic stiffness, and thermal expansion. Once a workpiece is machined inaccurately, we can modify the NC program to generate compensation tool paths, and then perform the finishing process. However, the modification of the NC code is time-consuming, and the results may not be satisfactory as well. We propose...
While performing five-axis machining, it is usually expected to complete all the cutting without having to re-clamp the workpiece. In other words, the workpiece should remain at the same location during the whole five-axis machining process. The current procedure to perform five-axis machining on a workpiece is to use CAM software to generate the tool paths and then perform a simulation or real cutting...
Two potential problems are usually ignored by CAM software for five-axis machining: one is the overtravel for the three linear axes of the five-axis machine tool, and the other is the collision between the spindle and the worktable. The objective of this research was to propose a method based on the visibility map and then, develop a computer program to prevent the mentioned problems from happening...
Currently, two major processes are being used to produce prototypes, namely machining and rapid prototyping. Machining is generally more accurate and precise, but it is difficult to produce objects with certain complicated features. In contrast, rapid prototyping can produce objects with complicated features, which allows materials to be used more efficiently. However, due to the uneven shrinkage...
The objective of this research was to design controllers for balancing a rotary inverted pendulum. The controllers designed by the pole-placement method and the linear-quadratic regulator (LQR) method were discussed, and experiments and simulation were conducted to study the performance of the controllers. By using an L9 orthogonal array proposed in the Taguchi methods, the appropriate feedback gain...
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