Experimental Studies on Perpendicularity of Drilling Operation using DOE
Keywords:Drilling, EN8, EN31, ANOVA, Perpendicularity.
In drilling operation, work piece Geometric dimensions and tolerancing (GD&T)
requirements is an important requirement for many applications. Thus, the choice of optimized
cutting parameters is very important for controlling the required perpendicularity requirements. The
focus of present experimental study is to optimize the cutting parameters through work piece
Geometric dimensions and tolerancing (GD&T) requirements as perpendicularity. This paper reports
an experimental investigation of a full factorial design performed on EN8 and EN31 materials using
HSS drill with point angle 118° and helix angle 30° by varying the drilling parameters such as
spindle speeds, feed and coolant ratio to determine optimum cutting conditions. The work piece
Geometric dimensions and tolerancing (GD&T) requirements analyzed by perpendicularity.
Analysis of variance (ANOVA) was carried out for perpendicularity on EN8 and EN31 materials
and their contribution rates was determined. Design of Experiments (DOE) methodology by full
factorial Design was used in the multiple objective optimizations (using Mini Tab 16, software) to
find the optimum cutting conditions for least perpendicularity defect.