Abstract
Abstract The use of composite metal stacks has been increasing and in this work, armour steel, sandwiched between two GFRP panels, is drilled with Tungsten Nitride coated drills and the roundness error in the top panel and the bottom panel are measured with the help of CMM. The effects of the input parameters on the roundness error are analyzed separately for the top and bottom panels. The values of roundness error are very less for the bottom GFRP panel and this is because of less vibration experienced by the drill due to the guided action of the middle metal panel.
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