Two new types of 3-PUU translational parallel manipulator are proposed in this thesis. The first manipulator has an equilateral rail arrangement on the base plane, but each side extends out by a specific length. The second manipulator has the following rail arrangement: the first rail is along the x axis on the base plane; the second rail also lies on the base plane and makes an angle θwith the first rail; the third makes an angle θ. Inverse kinematic analysis for the two manipulators is carried out using geometry, the results of which are used to determine manipulators’ workspace. Loop-closure equations are utilized to find the Jocabian matrices of the manipulators. Closed-form solutions for the forward kinematics are also obtained.