Page 189 - Demo

187SPOT DRILLING AND CHAMFERING%u00bd%u0009Spot DrillThe spot drill has a short and thick shape. These small drills are designed to be extremely rigid so they can pinpoint the location of the required hole. The spot drill is also characterized by a thin web at the point to prevent drill walking during machining. It is important to know that a spot drill has no land or body relief and is not designed to drill past the depth of the point angle, which is just enough to drill a %u201cdetent%u201d or %u201cdimple%u201d in the workpiece.thick shapeshort length thin web