The secret method of drill 1. switch on the machine for grinding table 2. stand on the side of the wheel stones, because centrifugal force in the open for the first time are very strong and must give rotating grinding stones still before posing grinding sharpening cutter.3. use your left hand touching the tip of drill bits. The right hand cradled in the foothills of the drill by the left hand is placed on the pallet when sawing stone work with cutting drills, so moving your wheels and grinding stones approached slowly.4. view from the top will do drills, angle with the front surface of the grinding stone 59 degrees. 5. both sides sharpening angles, both by reference from section 4.6. the movements of drill grinding stone wheel into contact with. Notice the sharp cut of the drill was a secret until a good, sharp cutting edge barrier ends up with twist drill clockwise to grinding perspective free 8-12 degrees.7. grinding angle drill with stone wheels page 59-degree angle (Angle Cutting) pecking at an angle and includes drills, which will end with size vary according to the type of material to be pierced like General will have 118 degree included angle. 8. gently twist drill, spin with more pressure. To make the free rear cutting edge angle, do this on both sides of the cutting edge of drill.9. มุมรวมของดอกสว่าน ซึ่งถ้าลับได้มุมที่ถูกต้องความยาวของคมตัดทั้ง 2 ด้านจะต้องเท่ากัน10. ตอนลับต้องนำดอกสว่านจุ่มน้ำหล่อเย็นบ่อย ๆ เพื่อระบายความร้อน ลับดอกสว่านสลับกันจนได้ขนาดมุมเท่ากันตามต้องการ
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