I recently discovered carbide drill bits. Wow, heavy, big, gold(TiN), and expensive.(Cheap on the bay). So, I drilled an 1/8th i hole through a 3/8 tap. What a thrill, but it took 2000 rpm on a drill press to do it. I think it spot annealed, then drilled a bit, then spot annealed etc. So I ran out and got a 5/16 carbide tipped die drill from ptd and a5/15 hiroc drill. Also a 1/8" tile bit too. Put it in my Rigid 18v and tried to drill through a 6" mill bastard file. No chance. Used the carbide tipped die drill on a piece of 1/4" plate. Yeah, it'll drill, it just doesn't want to. Cobalt works fine on this. If it cant even drill through a file what good is it? Why cant you use soild carbide jobber bits with steel? One place claims their M-7 bits will "drill through" my new CTD cobalt drills. BS? How can m7 drill through m42? Is there a carbide drill that will "drill through anything this side of roswell", quicky, smoothly, acting just like a jobber drill in steel? Anybody heard of the way, they look good, but will their drills be as good as cleveland twist?
19 years ago