Evaluate of the Effects of Drilling with Varying Spindle Speed Using Different Thickness of GFRP on the Damage FactorWoo Tze Keong, Faiz Ahmad, Safian Sharif and Mohd Azuwan MoinserMATEC Web of Conferences, 13 (2014) 04008DOI: https://doi.org/10.1051/matecconf/20141304008