How to Deal with the Sharpening of the Tip for HSS Straight Twist Drills?

The straight shank twist drill bits will wear out the drill after a long period of use and causing the drill bit to fail

Then What Should I do If the Twist Drill of the Shank is Worn Out?

The advantage of straight shank drill bit

1. The straight shank twist drill bits use a unique wave-edge design to achieve superior sharpness and strength while promoting chip discharge
2. The 140 ° vertex angle reduces the feed force in the initial stage of drilling and provides a very self-centering ability
3. Improve the quality of hole processing, improve the thermal rigidity and prevent the occurrence of cutter breakage caused by chip accumulation

We will show you how to polish the straight shank drill bit

Method for Grinding Straight Shank Drill Bit

Before Grinding the Drill Bit

1. First place the main cutting edge of the drill and the grinding wheel surface on a horizontal surface
2. Ensure that the entire cutting edge is ground when the cutting edge contacts the grinding wheel surface
3. This is the relative position of the drill and the grinding wheel, the first step is to set the position and slowly lean on the wheel surface

After the Cutting Edge Contacts the Grinding Wheel

1. It must be ground from the main cutting edge, that is, the cutting edge of the drill bit first contacts the grinding wheel, and then slowly grinds down along the entire flank surface
2. Then the bit is cut, it can touch the grinding wheel gently
3. Carry out a small amount of sharpening, pay attention to observe the uniformity of sparks, adjust the pressure on the hand in time, and pay attention to the cooling of the drill
4. Do not allow it to overfire, causing the cutting edge to discolor. When the cutting edge is annealed, check the cutting edge
5. When the temperature is high, the drill bit should be cooled in time

This Angle is the Angle of the Drill Bit

1. The wrong angle at this time will directly affect the size of the vertex angle of the drill bit
2. The shape of the main cutting edge and the oblique angle of the cutting edge
3. Here is the position between the axis of the drill bit and the surface of the grinding wheel
4. The relationship is 60 °, which is generally more accurate

After reading this article, you should have a deeper understanding of how to polish straight shank drill bit

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