Once the tip of the drill into the surface of the workpiece, the drill tip geometry immediately in a secondary position. Other factors to be considered to stand out, such as chip evacuation and rigidity. The drill bit not only need to have the appropriate shape of the drill tip, it must always maintain a sufficient rigidity. Drilling convex surface of the cylindrical surface or the like, almost all with a shorter of the drill, especially those using the step of the power head.

Tom Trost, a production of the solid carbide drill the CJT KOOICarb company vice president of sales, said the company's production of the short length of the solid carbide drill 30% of the 140 ° point angle. TiN coating, cross grinding drill has become the market's conventional products.abrasive wheel

The design drill should take full account of the the chip evacuation drill. Drill drill 3 ~ 4D depth,, Strubler said, most of the drill bit manufacturer widened its drill trench. In recent years, these manufacturers have learned to manipulate the groove in the form of the wheel, making improvements. For carbide drills, parallel to the bottom of the trench, or a smaller core thickness increments so that the groove becomes larger. For high-speed steel drill, opposite, in order to maintain the desired rigidity of the increment of the core thickness is large and the grooves becomes smaller, small space Paixie, cause chip removal difficult.grinding wheel