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Author
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Topic: Drill bits for stainless steel?
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68F100
Gearhead Posts: 1998
From: Fort Madison, Iowa USA - United We Stand
Registered: Oct 99
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posted 06-20-2002 11:04 PM
   
I have to drill a lot of holes in stainless steel for my job. Seems like drill bits are junk after about two holes. I know you have to drill slower and use cutting oil, but I'm still wondering if any of y'all have used drill bits that stand up well to stainless.
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Dave Witthoeft
Gearhead Posts: 1964
From: IL.
Registered: Dec 2000
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posted 06-21-2002 02:34 AM
Titanium may help.
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hotboy1966
Journeyman Posts: 59
From: Everett, Wa. USA
Registered: Apr 2002
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posted 06-21-2002 02:59 AM
SLOW! SLOW! SLOW! You might also try a heavy duty cobalt drill. If you know how to resharpen drills, try adding more relief on the heel of the cutting edge. This will allow the drill to bite in better. Be careful though, to much relief weakens the cutting edge. You might also hone a .004" flat on the cutting face if the bit. This will reduce the tendency to "grab."
Good Luck,
Dave
PS. Regulsr drill bits are easy to sharpen, the cobalt ones aren't
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rellik74
Gearhead Posts: 124
From: Trinidad , Colorado, USA
Registered: Jul 2000
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posted 06-26-2002 07:59 PM
cobalt drill bits work real well but they must be excelent quality the ones I have used are from ww graingers. Drill slow and keep you drill and work cold. When I have had to drill smaller parts I have put them in the frezer over night. I have drilled holes in 303 stainless 1/4 thick at home with a vise and electric drill.
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Ken
Gearhead Posts: 3697
From: Prospect, Ct. M&M Member No. 31 MCA Member 49299
Registered: Jun 99
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posted 06-26-2002 09:10 PM
Good quality HSS drills should drill through SS all day long when run at the proper RPMs with lubricant  !!!------------------
Conciousness - that annoying time between naps. Ken
1965 Springtime Yellow Coupe - 302GT40-4spd
Edlebrock RPM Air Gap - 670cfm Holley Street Avenger
and much, MUCH MORE !!!
My 1965 (aka RUMBLE BEE) Photo Page
1995 5.0 Laser Red - 5spd - Coupe
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mcj67
Journeyman Posts: 1
From: Maryland
Registered: Jul 2002
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posted 07-13-2002 08:18 AM
Use a good quality Carbide tip concrete/masonary drill bit.
I used to do plumbing work in comercial kitchen's and had to drill stainless steel on a daily basis, these bits drill it very well, Happy drilling. Mike Jones
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jsracingbbf
Gearhead Posts: 1399
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 07-13-2002 11:24 PM
Try those pilot tipped bits made of titanium. They aren't cheap, but they do cut a small pilot hole as you drill which makes it easier for the bigger bit to follow. I used to do electrician work and also had good luck with a electrician's hardened stepper bit, around $40.00 bucks but well worth it. I still use mine alot.
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Jerry Smith
69 Mustang Pro ET Drag
"Any tool dropped while working on a car will roll underneath to the exact center" --Murphy's Law
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jkilroy
Gearhead Posts: 1662
From: Vicksburg, MS
Registered: Dec 99
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posted 07-16-2002 08:59 AM
SS will work harden in no time, you must use a HEAVY feed and low RPM.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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GypsyR
Journeyman Posts: 39
From: SC
Registered: May 2002
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posted 07-19-2002 12:34 AM
I had to drill some holes through some leaf springs once, boy that was NOT fun. After killing half a dozen bits (the cobalts weren't too bad) a machinist friend suggest I use carbide. My jaw dropped at the prices, it was cheaper to keep killing HSS bits. He said go buy a "carbide tipped masonry bit" slightly bigger than what I needed. I grabbed one from Home Depot for $5 or so and took it to him. He ground the tip to the proper diameter and sharpened it correctly for use on steel. I did have to resharpen it once before I finished, but it worked!
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N266fords
Gearhead Posts: 112
From: Spokane ,WA USA
Registered: Apr 2003
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posted 04-23-2003 06:26 PM
hey guys i am a 37 year old machinist and, you want to use colbalt like mentioned previously titanium is very brittle and the to hard surfaces dont like working with each other drill slow 300 rpm on press or 1/2 drill with v.s. switch use a cuuting oil to cool the bit good luck i know im new but i am full of info but i wont reply unless i know for a fact what i am saying is right
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