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amakarevic 04-08-2014 03:59 PM

Are some drill bits better for mechanical (metal) work than others?
 
I am looking to buy a set of high quality metal drill bits. Usually, drill bits out there on the market are not classified for metal vs. wood and other softer materials. Are some drill bits better for automotive work and metal applications than others?

MTN REMODEL LLC 04-08-2014 04:02 PM

Cobalt

amakarevic 04-08-2014 04:03 PM

Quote:

Originally Posted by MTN REMODEL LLC (Post 1334353)
Cobalt

the Lowe's house brand ?

MTN REMODEL LLC 04-08-2014 04:11 PM

Quote:

Originally Posted by amakarevic (Post 1334354)
the Lowe's house brand ?

Ya know.... I'm really not sure..... Cobalt is an additive/alloy in the bit, and I do not know for certain, but I think there are different qualities of cobalt steel...

I don't know how you would know that quality... but I would suspect that Lowes probably carries a HO low/med type quality.

Just my guess

joecaption 04-08-2014 04:20 PM

In order of the worst to the best.
High speed steel.
Titanium nitride coated.
Cobalt.

Oso954 04-08-2014 04:22 PM

Kobalt is Lowe's own brand of tools.
Cobalt is an element or refined metal.

amakarevic 04-08-2014 04:39 PM

here we go: [ame]http://www.amazon.com/gp/product/B0000TZX3A/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX 0DER[/ame]

SeniorSitizen 04-08-2014 05:05 PM

Drill Bits
 
Both Cobalt and HSS ( high speed steel ) will work but when drilling steel don't forget that a drop or two of cutting fluid every second or two works wonders with either of those two mentioned. Search cutting fluid for your favorite. Amazon has it too.

MTN REMODEL LLC 04-08-2014 10:26 PM

Quote:

Originally Posted by Oso954 (Post 1334366)
Kobalt is Lowe's own brand of tools.
Cobalt is an element or refined metal.


Oh... Thanks OSO.... never thought of that... I thought OP was looking at a set of cobalt bits at Lowes..........forgot that was their store branding.

MTN REMODEL LLC 04-08-2014 10:28 PM

Quote:

Originally Posted by Fairview (Post 1334379)
Both Cobalt and HSS ( high speed steel ) will work but when drilling steel don't forget that a drop or two of cutting fluid every second or two works wonders with either of those two mentioned. Search cutting fluid for your favorite. Amazon has it too.

And slow speed and a drill press......

4reel 04-09-2014 10:26 AM

Do not forget lubricant when drilling. The heat is what kills the drill. The lubricant is really there to cool the bit.

mikegp 04-09-2014 11:56 AM

Also, for metal, the stepped up bits work nicely. You could also just start small and work your way up.

http://ecx.images-amazon.com/images/...OL._SY300_.jpg

MTN REMODEL LLC 04-09-2014 01:51 PM

I just had to drill a SS sink for a center mount faucet..1 3/8 hole.

SS is very hard.... and sure do not have a 1 3/8 cobalt bit.

Started the hole with a 1/4 cobalt twist.... and then went to a step bit to go out to 1 3/8.

The step bit was just a titanium coating not cobalt.

Not sure why it worked so well after starting with a pilot hole.

Oso954 04-09-2014 05:29 PM

Any time you are cutting or drilling hard metal, a little bit at a time works better than going the big bite.

Before step bits, it was common practice to drill holes 1/8 inch at a time with a bit change between every 1/8.

Still done that way for thicker materials with deep holes.

4reel 04-09-2014 06:11 PM

Speed
 
Speed is another important factor. The faster the bit the higher the heat. Heat destroys temper in drill bits.


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