What influence carbide drill hole quality - Xmystool.com
If a hole has a high tolerance or high surface finish requirement, a secondary process like boring or reaming typically finishes the hole and is responsible for the final specifications. In these cases, the main job of the drill may be to make as many holes as possible, as quickly as possible, with the key quality characteristic being location. But that isn’t always the case. In some applications, a little extra time and attention might help the carbide drill meet quality specifications in one operation. Or, it might be determined that the quality of the drilled hole influences its ability to receive a quality secondary process. For example, if a hole has been drilled at an excessively high speed, the heat may have work-hardened the material, which can dramatically reduce the life of a tapping tool or even make the material too hard to tap. A carbide drill might be the most common tool in the toolbox but it is also the least understood. A low helix angle or straight-f...