Delamination is a serious issue during drilling of FRP composites. The purpose of this research is to determine the effect of process parameters on delamination during drilling of kenaf and banana fiber reinforced in epoxy hybrid composite using Taguchi method. The FRP composite was fabricated by hand‐layup technique. The fabricated specimen was drilled using HSS drill bits (5, 10, 15 mm) coated with tungsten carbide. The contemplated process parameters are feed, and speed. The “Minitab 18” software was employed to investigate the data collected by taking advantage of the various statistical and graphical tools available. The trials were carried out by taking advantage of Taguchi's L‐9 factorial design orthogonal array. Through several steps, it was found that the optimum drilling parameters are spindle speed = 3000 rpm; feed = 150 mm/min. Thus, in this research, an attempt has been made to optimize the drilling parameters.

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Certain basic relations between the cross-sectional parameters of the cotton fiber have been obtained and their direct application for determining the cotton fineness and maturity explained. These may be used, with advantage, in place of the empirical relations derived from the values of various cross-sectional parameters physically measured on selected cotton types and currently used for estimat ing the fineness and maturity of cotton by air-flow methods.

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