Drilling 27/64 with solid carbide drill | |
Hi, I will be using a solid carbide drill for the first time, just want to get some input on feed and speed for it. I will be drilling a .422 dia hole for a 1/2-13 tap, in round bar. Round bar is .875 dia, and is 4140 HRA. I am using a cobalt twist drill now - we centerdrill, drill, c-sink and tap. But with the solid carbide drill, should i use a center drill? I can sacrifice a lower feed n speed if it will increase tool life, I'm not in that big of a hurry! |