Abstract: Rack and Pinion are basically the mechanical elements used to convert circular motion into linear motion. It consists of a pinion which is basically a gear and rack which is a straight platform having the teeth on its one side. Generally material hardness for pinion is softer than rack material. In this paper, numerical analysis in mesh convergence study has been done for the assembly of rack and pinion. Fusion 360 has been used for the part of modeling and Ansys workbench has been used. Mesh convergence study have been done by comparing the results of hexahedron and tetrahedron mesh. The size of the element is approximately constant. It was observed that there is significantly difference on stress values for both mesh. However the mesh quality parameters observed to be near about same.