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In contrast, the 4-facet solid carbide drill that is similar to the standard twist drill of High Speed Steel (HSS) shows a minimum residual strength at 15 mm/min, while the parabolic drill gives a maximum residual strength at each feed speed.
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Kefid · The parabolic spiral allows chips to flow up quickly, not blocking the hole or requiring frequent drill bit withdrawal to clean out wood chips. Parabolic drill bits rarely shred the area surrounding entry and exit holes, leaving less damage to be corrected after drilling. Parabolic drill bits last a long time, with breakage a problem only with
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