Twist drill 200mm deep bore, what does the drill grind?
A standard twist drill is a very common drill tool. The utility model has the advantages of simple structure and convenient sharpening, but the grinding method is really good, and the method and the skill of grinding are well mastered. Factories also have such a situation, the work of more than ten years of workers, grinding well, twist drill also quite a lot. What is the reason for this? The key is methods and techniques. If the method is mastered, the problem will be solved.
The drill bits can also be opened with a plurality of chipping grooves to narrow the iron filings. Methods and techniques for sharpening the standard twist drills are described
The students have learned the relevant knowledge of standard twist drills in the course of production, and can basically memorize the standard sharpening requirements of standard twist drills:The vertex angle is 118 + 2, 2?The posterior horn at the margin of the hole was 10 -14 degreesThe transverse edge angle is 50 degrees -55 degrees(two) the length of the main cutting edge and the two angles of the axis of the drill bit must be equalTwo main flank surfaces should be sharpened and polished.
