3. This is a 3 DOF spatial robot with 2 rotational joints and 1 translational joint in the

reference pose. [3 marks]

Yo

dz

Please answer the follow questions using the DH method:

a) Define all the required coordinate systems associated with each joint and derive link

parameters based on the DH method. [y-axis direction is given; you have to assume the

other axes directions] (0.5 mark)

b) Derive the transformation matrix between the end-effector and the base coordinate

system ³Ho. (1.5 mark)

c) Calculate the coordinates of the point C and draw the corresponding configurations based

on the values of parameters and variables given: 1₁ = 12 = 13= 6, 0₁-30°, 0₂ = 60° and

assume d3 (1 marks).