If the two flutes of the drill were slightly different from one another, one could come into contact before the other. This would damage the workpiece and result in a defective tool. Using a larger angle drill will allow the drill to find the correct location by guiding the tip of the drill to the center. If the outer diameter of a carbide drill were to contact the workpiece first, the tool could chip. What Happens if I Use a Spot Drill with an Improper Angle? ![]() By leaving a chamfer, screw heads sit flush with the part once inserted. However, some machinists choose to use these tools for a different reason – using it to chamfer the top of drilled holes. Marking Your SpotĪ Spotting Drill’s purpose is to create a small divot to correctly locate the center of a drill when initiating a plunge. On the right, a drill is approaching an area with an angle that is far too small for its point. On the left, a drill is entering a previously drilled spot with a slightly larger angle than its point. ![]() Using a drill angle equal to the drill angle is also an acceptable situation. If a spotting drill with a smaller point angle than your drill is used, your drill may be damaged due to shock loading when the outer portion of its cutting surface contacts the workpiece before the center. Therefore, a spotting drill should have a slightly larger point angle than that of your drill. ![]() Ideally, the center of a carbide drill should always be the first point to contact your part.
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