If you have a choice of which style to use, you should take advantage of that choice. See our article on deep hole drilling for many more tips. If you are drilling deep holes, you will find parabolic flutes are extremely helpful. One more geometry-related tip for drill bits: They say this was mostly a marketing ploy. This style is also self centering which means the drill starts cutting without the need of a pilot hole.Īccording to Drill Doctor, some years ago most twist drill bits were 118 degree but now the 135 degree split point drill bits are the most commonly used angle. This reduces the amount of pressure needed to make the drill cut. Using a more rigid setup such as a drill press can also help.Ī split point drill bit has two additional edges ground into the chisel edge, which make the entire point of the drill one long cutting edge. Grinding a split point can help to minimize this walking behavior. You’re more likely to need a spot drill or at least to center punch the hole. This is the flip side of more gradual even contact of the cutting edge. The disadvantage of a 135 degree point angle is that the bit is more prone to walking around. The gentler cut of the 135 degree point is because the flatter angle means the cutting edges come into contact with the hold more evenly and gradually than a 118 degree point. Using a 118 degree point angle in a hard material will result in excessive tool wear of your drill bits. However, the 135 degree angle will give a gentler cut which is better suited to harder materials. The 118 degree point angle is more aggressive and is preferred for soft materials like wood on up to aluminum. The choice of which angle to use is largely based on the material being drilled. The two most common Drill Bit Angles, or to be precise, Drill Bit Point Angles, are 118 degrees and 135 degrees. An important factor when choosing the best drill bits for your project is Drill Bit Angle.
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