Wood based panel such as medium density fibreboards (MDF) are extensively used in the furniture industry. The most common machining process used for joining is drilling. In order to achieve a good surface quality and minimize the delamination, two of the main parameters must be taken into consideration while drilling: the tip angle of the drill bit and the feed speed. The objective of this study is to analyze the influence of the tip angle of the drill bit and the feed speed on the processing quality evaluated by the size of delaminations at the entrance side and the exit side of the drill bit for two types of drills: flat and twist (helical) drills. To assess the defect, a non-dimensional parameter was used: the delamination factor. The results showed that, in general, the combination of small tip angle with low feed rate minimizes the delamination at drilling.
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