Consideration of the position error problem uses the models entered for solution of inverse kinematics for parallel-kinematics machines. Obviously, an actual motion of the moving platform of the l_i-DOF mechanism (l_i = 2 ÷ 6) is accompanied with the same sextet of position-orientation errors δ_xi, δ_yi, δ_zi, δ_θi, δ_ψi, δ_φi, composing the twist δ for 1-DOF body. Since the set of drives of the moving platform is simultaneously served as a movement issue and as a suspension system, the moving platform can be modelled...