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 Which drill bit do I select?
Conventional Points or Split Points?
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Conventional Points with 118 degree included point angles are the most commonly used because they provide satisfactory results in a wide variety of materials. A possible limitation is that the straight chisel edge contributes to walking at the drill point, often making it necessary to spot the hole for improved accuracy.
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Split Points were originally designed for use on drills designed for deep oil holes in automotive crankshafts, hence they are commonly called "crankshaft points". Since its inception, the split point has gained widespread use and is applied to both 118 degree and 135 degree included point angles. Its main advantages are the ability to reduce thrust and eliminate walking at the drill point. This is a distinct advantage when the drill is used in a portable drill or in drilling applications where bushings cannot be used. The split point has two positive rake cutting edges extending to the center of the drill, which can assist as a chip breaker to produce small chips, which can readily be ejected.
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