We have a plane mechanical system consisted of pantograph mechanism and four bar one, with revolute and sliding joints. Then, we replace each revolute joint with super elastic hinge. So that, we have a system, strongly recommended, to achieve the same goal using minimum energy. The main goal of this paper is to elaborate a mathematical mechanism able to estimate the deviations of the considered system before and after replacing revolute hinges, taking into account the real performance of the new system through additional large displacements in the flexural hinges.