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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Disappointed with carbide drill bit performance
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 a 5/15 hiroc drill. Also a 1/8" tile bit too. Put it in my Rigid 18v and tried to drill through a 6" mill ******* 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 http://www.icscuttingtools.com/Products_Drills.htm? by the way, they look good, but will their drills be as good as cleveland twist? |
#2
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Disappointed with carbide drill bit performance
Basically two types of carbide drills. One for hard materials like hardend
die steel. One for abrasive materials, like glass filled epoxy, green ceramics. Not really interchangable. |
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Disappointed with carbide drill bit performance
Way too fast! Try about 100 rpm with lots of pressure and oil with a
pristinely sharp bit. "Ben" wrote in message m... 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 a 5/15 hiroc drill. Also a 1/8" tile bit too. Put it in my Rigid 18v and tried to drill through a 6" mill ******* 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 http://www.icscuttingtools.com/Products_Drills.htm? by the way, they look good, but will their drills be as good as cleveland twist? |
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