60% of the axial resistance of standard Fried Dough Twists drills comes from the horizontal edge, because the front angle of the horizontal edge is about -60 °. The "group drilling" removes 80%~90% of the horizontal edge of the Fried Dough Twists drill, and forms two internal edges. The front angle of the internal edge increases from -60 ° to 0 °~-10 °, thus reducing the axial resistance by about 50%, and making the feeding feel particularly light. The group drill sharpens the crescent groove on the outer straight edge, resulting in finer chips and smoother chip removal. The circular reinforcement generated during drilling is conducive to the centering of the drill bit, ensuring that the drilling is "smooth" and "round". Its drilling torque is reduced by about 30%, so it can be drilled with a larger feed rate. The outer edge has a sharp angle of 135 °, the inner edge has a sharp angle of 120 °, and the drill tip has a height of 0.06d, making it have excellent drilling performance. Due to its low cutting resistance, accurate and stable centering, it is particularly suitable for use on electric hand drills. Fried Dough Twists drill is a commonly used drilling tool for machining. Although the structure is simple, it is not an easy task to truly sharpen it. The key lies in mastering the methods and techniques of sharpening, and once mastered, the problem will be easily solved. Let me introduce the hand sharpening skills of Fried Dough Twists drills. The top angle of Fried Dough Twists drill is generally 118 °, which can also be regarded as 120 °.
If you want to know more about our products, please visit our website https://www.china-drill-bit.com. Hope to cooperate with you.
