Hss twist drill sharpening(2)
4, bit of edge to bobbing up and down, bit the tail can’t case become warped. This is a standard drill grinding movement, the main cutting edge on the grinding wheel is to bobbing up and down, that [Read More]
01/13/2016
Hss twist drill sharpening（1)
►Twist drill is a kind of common drilling tool, the structure is simple, but, it is not an easy thing to make a real good grinding. The key is to master grinding methods and techniques. The problem will [Read More]