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Unformatted text preview: the part is realized by the kinematics of the milling machine (figure 4b). It can be divided into two simultaneous movements. The first is the displacement of the milling machine’s head. It is described Surface Best Fit 197 by the vector Of O h that depends on the machining trajectory, the cutting feed and the time parameter t. Depending on its expression, different kinds of trajectories can be simulated. While this paper focuses on G1 interpolation, the vector becomes: Of O h = g x ( t ) ⋅ x p + g y ( t ) ⋅ y p + g z ( t ) ⋅ z p with g i ( t ) =bi1 ⋅ t + bi0 The second movement corresponds to the rotation of the tool. It is defined by an angle and expressed in the head coordinate system R h (O h , x p , y p , z p ) . Both vectors
z t and z h are identical. The angles (x p , x t ) and (y p , y t ) are thus both equal to which is time dependend. For a milling operation with constant feed and cutting velocity, the expression of is (t) = ω ⋅ t , where ω is the spindle rotation speed....
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.
- Spring '10
- The Land