Mainly drilling of control panel and operation panel of machine tool
On 2015-01-14 16:55:25
It is a sharpness that does not feel stress. At the time of cutting, opening the center hole just opens with only the weight of the drill. Previously, I used the center drill diameter 8φ, but I reduced it to 6φ to reduce the loss. It was because I had a sense of cheaper than I had purchased in sets. In a normal hole saw, it is difficult to open a 6 mm thick iron plate, but it can be opened without difficulty. Changing φ of hole saw is also recommended for one-touch drilling workers.