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Drill bits

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galen

11-05-2001 19:50:49




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Need the advice of someone with previous problem of this type. Have grade 8 stude bolt broken off in rockshaft housing on 3 point. What kind of drill bit will cut this bolt. Have tried welding on nut crystalized and broke out 1/16 inch of bolt. Was able to drill as far as heat penetrated which was about 3/8 to 1/2 inch with standard bit. Have since gotten a small carbide tip and am still just p-ssing my time away. Excuse my language but am really annoyed with this thing need it out before will trust load on 3 point. Please advise if stainless, cobalt titanium or any other type that will cut this bolt. Thank very much to any one who can help me with this problem.

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John

11-06-2001 21:16:17




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
Carbides, cobalt bits, or an EDM come to mind.

This doesn't apply in your situation, but I thought I'd mention it anyway. Broken taps or bolts can be removed from aluminum by using nitric acid.



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galen

11-06-2001 05:19:12




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
Thanks for the advice guys. I really appreciate it this has me quite peaved. I will try these and see which one works for me and my temperment. Again thanks much.



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Dagger

11-06-2001 05:18:26




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
I have had good luck with reverse-rotation bits. If you start them slow, they can dig in and can back the the broken bolt right out. I prefer the cobalt when I try this. It doesn't work all the time, but when all else fails...



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T_Bone

11-06-2001 03:25:42




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
Hi Galen,

You might try a trick that gunsmiths use. Get a carbon rod (sold by welding supply co) and hook up leads from a 12v battery, positive lead to the housing, negitive lead to the carbon rod (straight polarity). You stick the carbon rod on where you want to drill and let it heat. That will soften the metal so it can be drilled, with out taking the hardness from the base metal.

T_Bone



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Rod MI

11-05-2001 23:04:30




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
Galen or you can use a cement drill run it a high RPM with lots of coolant and take your time



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Norman(ID)

11-05-2001 20:48:47




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 Re: drill bits in reply to galen, 11-05-2001 19:50:49  
A cobalt drill will work, you will need to keep your drill speed as slow as posible, even as slow as 1 or 2 rpm if posible and use a cutting oil such as tap magic or similar. a friend of mine drilled out a broken drill bit using this method. trying to drill to fast will only generate heat and broken drill bits.



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