Indexed on: 18 Jul '08Published on: 18 Jul '08Published in: The International Journal of Advanced Manufacturing Technology
A CAD variation geometry approach is proposed for solving/modifying the inverse velocity/acceleration of the active legs and the forward velocity/acceleration of a 5-dof 4UPS + SPR parallel machine tool (PMT) during its simulation normal machining of a 3D free-form surface. First, the twin simulation mechanisms of this PMT with the same base are created for normal machining the same 3D free-form surface. Second, a velocity simulation mechanism of this PMT is created from the twin simulation mechanisms. Third, an acceleration simulation mechanism of this PMT is created from the three similar simulation mechanisms with the same base. Finally, the extension, the velocity and acceleration of the active legs, and the velocity and acceleration of the PMT are solved and modified during the simulation normal machining of the 3D free-form surface. The simulation solutions are verified by an analytic approach.