Getting local frame given a rotated base frame

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I am working on the inverse kinematics of my 6 DOF robot arm. It works by specifying a position and the orientation. The orientation is given as a 3 dimensional matrix in world frame. Given this orientation, I need to transfer it to my end effector frame (local frame). At rest, the projection of the end effector frame to the world frame P6_0 is:

X Y Z
0 0 -1
0 1 0
1 0 0

When i give an orientation in world frame, I want to find the corresponding orientation in local frame. The way I have tried to do this is by taking world frame orientation and multiplying with the inverse of P6_0. This ends up being wrong in most cases, but it works for some rotations too?

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