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Old 04-08-2014, 03:59 PM   #1
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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?

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Old 04-08-2014, 04:02 PM   #2
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Are some drill bits better for mechanical (metal) work than others?


Cobalt

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Old 04-08-2014, 04:03 PM   #3
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Are some drill bits better for mechanical (metal) work than others?


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Cobalt
the Lowe's house brand ?
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Old 04-08-2014, 04:11 PM   #4
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Are some drill bits better for mechanical (metal) work than others?


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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
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Old 04-08-2014, 04:20 PM   #5
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Are some drill bits better for mechanical (metal) work than others?


In order of the worst to the best.
High speed steel.
Titanium nitride coated.
Cobalt.
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Old 04-08-2014, 04:22 PM   #6
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Are some drill bits better for mechanical (metal) work than others?


Kobalt is Lowe's own brand of tools.
Cobalt is an element or refined metal.
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Old 04-08-2014, 04:39 PM   #7
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Are some drill bits better for mechanical (metal) work than others?


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]
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Old 04-08-2014, 05:05 PM   #8
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Are some drill bits better for mechanical (metal) work than others?


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.
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Old 04-08-2014, 10:26 PM   #9
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Are some drill bits better for mechanical (metal) work than others?


Quote:
Originally Posted by Oso954 View Post
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.
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Old 04-08-2014, 10:28 PM   #10
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Are some drill bits better for mechanical (metal) work than others?


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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......
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Old 04-09-2014, 10:26 AM   #11
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Are some drill bits better for mechanical (metal) work than others?


Do not forget lubricant when drilling. The heat is what kills the drill. The lubricant is really there to cool the bit.
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Old 04-09-2014, 11:56 AM   #12
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Are some drill bits better for mechanical (metal) work than others?


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

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Old 04-09-2014, 01:51 PM   #13
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Are some drill bits better for mechanical (metal) work than others?


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.
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Old 04-09-2014, 05:29 PM   #14
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Are some drill bits better for mechanical (metal) work than others?


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.
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Old 04-09-2014, 06:11 PM   #15
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Are some drill bits better for mechanical (metal) work than others?


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

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