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OT - Drilling Stainless Steel

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RDut

06-14-2004 06:08:35




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Hi All,
I'm trying to drill two little holes in my stainless steel flag pole and going no where fast. What type of drill bit do I need?? The titanium bits made a little mark, but that's about it.




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jimNCal

06-14-2004 22:09:33




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 Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 06:08:35  
Some very accurate advice below. Ken Bo has the most important bit tho. (no pun intended) Heat is the worst thing to make when drilling St/Stl. GO SLOW with many short pulls on the trigger. Any good cutting oil should do.

jim (st/stl day job)



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TIMW(PA)

06-14-2004 18:28:17




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 Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 06:08:35  
Definately start with cobalt...Those titanium are junk right from the git go...I usually have to sharpen them new one right out of the package for them to work! Now stainless will spot harden in an instant. If youve already smoked a drill bit in the hole even the cobalt are gonna have a tough time. then you either have to dremel it with a stone or carbide burr to get through the hardened surface or get a carbide bit but they are expepnsive and VERY brittle....Tim

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RDut

06-14-2004 10:00:13




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 Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 06:08:35  
Thanks for the info guys. The hole I'm trying to drill is only 7/64". The bit was purchased new just for this, and I do have one new bit left. I was not using a lubricating fluid because the bit never got warm, but I will try it next time. I have drilled all kinds of metal before but this one is trying to kick my butt. What about a carbide bit?? would that be better then the titanium??



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souNdguy

06-14-2004 18:15:33




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 Re: Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 10:00:13  
Got a dremel with a diamond bur you can start a pilot hole with?

Soundguy



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Rob

06-14-2004 15:05:48




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 Re: Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 10:00:13  
Cobalt drills are recommended for stainless.
I get and use Tap Magic cutting fluid at the hardware store. Pricy but worth it. Much less wear and tear on my cutting tools, faster work, and easy.
Surprising so. Drills pull themselves through hot roll when I use Tap Magic.
Well...maybe not all by themselves.
Cast iron and brass drill better without a lube though.



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Ken Bohannon

06-14-2004 06:56:46




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 Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 06:08:35  
Krypton drill bits, probably have to buy them thru a commercial tool guy. Your other option is go buy another set of bits, when you drill, go slow, hit drill trigger intermittently, kinda like playing asteroids, this helps keep your bit cool, also if you can find some cetyl alchol, you can drill by blipping the trigger, then stick your drill into the c,a. this cools the bit and keeps it sharp. I was an aircraft structure mech in the navy for 11 yrs and worked for a major airline for 15 yrs and hold an A & P license so have some clue of how to save yourself a lot of aggravation drilling metals. Not bragging myself up just want let you know I am not talking trash, trust me I haven't bought any new drills in years.

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Jim Cox

06-14-2004 06:38:46




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 Re: OT - Drilling Stainless Steel in reply to RDut , 06-14-2004 06:08:35  
back in my rooftop HVAC days, we used brand new bits from Malco, but nothing special about them. One per hole generally, and often coated the bits will cooling wax to keep the temp down

Jim Cox



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