Match Drill Geometry to Material for Better Holes

The drill point angle is the most critical geometry for material-specific performance. For soft materials like aluminum and plastics, use a 118-degree point angle with a polished flute surface. This reduces friction and prevents chip packing. For harder materials such as stainless steel or titanium, switch to a 135-degree point angle with a split point. The steeper angle lowers thrust force and the split point cuts through the work-hardened layer, improving centering and reducing walking.

Flute design also varies. Standard parabolic flutes excel in deep hole drilling in soft materials because they evacuate chips quickly. For abrasive materials like cast iron, use a slower helix and wider flute to resist wear and allow chip flow. Coating choice matters too: TiN for general steel, TiAlN for high-temperature alloys, and uncoated carbide for non-ferrous metals to avoid galling.

Always match the drill to the material's hardness and chip formation behavior. A sharp, properly ground drill reduces burr formation, extends tool life, and improves hole quality. Test different geometries on scrap material first to confirm performance before production runs.

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