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#4475211 - 07/31/17 06:01 AM Drills
greasegunn Offline


Registered: 01/01/12
Posts: 202
Loc: NY
After struggling to drill out a broken stud on an exhaust flange Iím in the market for some better drills. Laying under the car is not my idea of fun so I want something that will zip through materials commonly found on automobiles as quickly as possible. Looks like the choices are High Speed Steel, cobalt, and carbide. Or maybe I should just buy inexpensive drills and treat them as throw aways? What are the pros and cons of each? For example I understand that carbide tends to be brittle. What is everyone else using with good success?

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#4475224 - 07/31/17 06:31 AM Re: Drills [Re: greasegunn]
Bumble_guy Offline


Registered: 07/14/14
Posts: 68
Loc: Northern Illinois
Cobolt is your friend
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#4475237 - 07/31/17 06:46 AM Re: Drills [Re: Bumble_guy]
Kira Offline


Registered: 08/19/10
Posts: 5244
Loc: Champlain/Hudson Valley
Is "Cobalt" that Home Depot store brand name or a type of steel alloy? serious question

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#4475240 - 07/31/17 06:50 AM Re: Drills [Re: greasegunn]
jjw6455 Offline


Registered: 03/06/14
Posts: 4
Loc: ohio
I struggled with that exact same stud on my Mazda 6, went through 3 or 4 bits and wasn't getting anywhere. Picked up a cobalt bit from the local store and it zipped through the stud in 30 seconds.

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#4475245 - 07/31/17 06:57 AM Re: Drills [Re: greasegunn]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
Cobalt is a type of steel, very expensive but ideal for drilling on hardened steel. Great for drilling out bolts before using a extractor or when drilling gun receivers for scope mounts and the metal is surface hardened or like the old Springfields just plain hard steel. The negative is that its brittle, so drill straight and get the surface center punched to prevent the tip from walking. Learn how to sharpen bits properly. 30 seconds at the grinding wheel putting a good point on can reduce efforts needed to drill.
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#4475280 - 07/31/17 07:59 AM Re: Drills [Re: greasegunn]
Trav Offline


Registered: 11/20/06
Posts: 18892
Loc: MA, Mittelfranken.de
Cobalt M42 jobber length bits and some smaller left handed ones for broken bolts and studs. For drilling through broken bolts I sometimes use solid carbide bits, you only need a few sizes but they are expensive an 1/8 and 1/4 will get you started with a pilot hole for most broken bolts then use the LH bit.


Edited by Trav (07/31/17 08:02 AM)
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#4475301 - 07/31/17 08:17 AM Re: Drills [Re: Kira]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Originally Posted By: Kira
Is "Cobalt" that Home Depot store brand name or a type of steel alloy? serious question
"Kobalt" is a Lowes brand.

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#4475302 - 07/31/17 08:18 AM Re: Drills [Re: greasegunn]
Astro14 Offline


Registered: 10/10/10
Posts: 8538
Loc: Virginia Beach
All cobalt bits are expensive.

I've got a whole set. Nothing better.

But even cobalt dulls. Get a drill doctor and keep them sharp.

You'll be amazed.

You don't need a King Kong drill, just good, sharp, bits.
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#4475357 - 07/31/17 09:15 AM Re: Drills [Re: greasegunn]
9050lx Offline


Registered: 11/07/08
Posts: 115
Loc: FL
Sears has a set they occasionally offer for a little over 30 bucks on sale.Probably chinese but they seem to work well.

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#4475371 - 07/31/17 09:27 AM Re: Drills [Re: jjw6455]
greasegunn Offline


Registered: 01/01/12
Posts: 202
Loc: NY
Originally Posted By: jjw6455
I struggled with that exact same stud on my Mazda 6, went through 3 or 4 bits and wasn't getting anywhere. Picked up a cobalt bit from the local store and it zipped through the stud in 30 seconds.


As it turns out my issue was also on a Mazda 6 - the stud from the muffler that attached to the pipe had broken off. I needed to drill out the stud put in a nut and bolt.

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#4475372 - 07/31/17 09:28 AM Re: Drills [Re: Astro14]
Trav Offline


Registered: 11/20/06
Posts: 18892
Loc: MA, Mittelfranken.de
Try solid carbide, they are amazing at cutting through hardened metal and stay sharp a long time. Both the cobalt and carbide give cordless drills much better performance.
This will go through a broken bolt like a hot knife though butter.

http://www.ebay.com/itm/1-8-Solid-Carbid...4-/131380163688
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#4475396 - 07/31/17 09:57 AM Re: Drills [Re: greasegunn]
Bandito440 Offline


Registered: 02/13/12
Posts: 3854
Loc: NEUS
Carbide is the proper choice here. Be sure to avoid chatter; they can be brittle.
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#4475422 - 07/31/17 10:17 AM Re: Drills [Re: greasegunn]
Dyusik Offline


Registered: 09/26/14
Posts: 1984
Loc: US-WA
+1 for cobalt, those bits are worth every penny.
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#4475671 - 07/31/17 02:37 PM Re: Drills [Re: greasegunn]
Bumble_guy Offline


Registered: 07/14/14
Posts: 68
Loc: Northern Illinois
I don't know if you have Menards out by you but a set of cobalt bits by mastercraft 26 bucks ,work well
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#4475697 - 07/31/17 03:13 PM Re: Drills [Re: bioburner]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: bioburner
Cobalt is a type of steel, very expensive but ideal for drilling on hardened steel.


Correct, and I never waste my money on anything of lesser quality.
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