Sensitivity Analysis and Tolerance Allocation for Microplanar Drill Point Grinders

A sensitivity analysis and toierance analysis/allocation of the grinding parameters is presented to guide the design of pianar micro-drill point grinders. The mapping from the desired micro-planar drill point geometry parameter space to the grinding parameter space of the drill grinder has been established to determine a unique grinding parameter set for the desired planar micro-drill point geometry. By means of the sensitivity analysis (variations of the drill point geometry parameters with respect to the grinding parameters), it is indicated which parameters are the most important and most profoundly affect drill point geometry. To specify the upper and/or lower limits of grinding parameter tolerances, and to assure that the total tolerance of the drill point geometry is maintained throughout the desired range, two methods are presented. Tolerance analysis shows the maximal tolerances of the drill point geometry parameters in terms of the maximal tolerances of the grinding parameters. This method requires the tuning of the tolerances ot the grinding parameters until the tolerance ot point geometry are satisfied. As an inverse problem to tolerance analysis, a rational tolerance allocation algorithm is investigated to assigr. the unknown grinding parameter tolerances from the known maximal allowable tolerances of the drill point geometry.