This research focuses on the lapping process optimization by designed experiments and response surface methods. The lapping process intends to introduce a finely ground flat on disk clamp, the lapping process will remove material from the disk contact radius and provide the desired dimension of the surface. The lapping plate is produced by cubic boron nitride materials. Its mechanism and characteristics are very complicated to conduct and investigate. In addition, the two-level factorial design was applied to a preliminary study, the analysis of variance was performed to determine the optimal combination of process variables which consist of lapping time, lapping speed, downward pressure and charging pressure. The desirability function approach of the nominal-the-best was used to compromise the multiple responses of material removal, lap width and clamp force into single response called the overall desirability (D). Firstly, the multiple regression models were developed from the statistically significant parameters. Secondly, the multi regression model in forms of the path of steepest ascent moved the region of experimental region toward the design point with the maximal D level. After the path of steepest ascent deteriorated the modified simplex method was integrated to drive the process achieving the optimal condition. The experimental results showed that there is a significant D increase to the level of 0.92, approximately 50% when compared to the current operating condition. The optimal condition of process variables which consist of lapping time, lapping speed, downward pressure and charging pressure are 49 sec., 26 rpm, 6.9 psi and 7.7 psi, respectively.