Drill bits

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jonathan01

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Hello, what brand would be best. I don't mind spending the money if they are going to last a long time.

I plan to only use them in a lathe, drill press, mill, etc not in a hand drill.

I have looking at the cobalt 115pc 135* split point sets. Norseman, triumph thunderbit, and chicago-latrobe are the ones I am looking at..

The norsman and thriumph sets are about $750 and the chicago-latrobe are about $940, what's the jump in price for?

Hope yall can help,
Jonathan
 
Don't know about the price jump, I use the triumph drillbits made in the USA I think most of the other one are to.

Paul
 
First of all, that price is WAY off the charts for a 115 piece drill set. "jawdrop:

You can go to McMaster Carr or Grainger and get a set for around $500 and it will be American made, probably Greenfield or Cleveland or Chicago-Latrobe. The last drills I bought from MC were made by Greenfield and were excellent quality. Don't pay $750 for a set of drills.

Tom
 
I go with Tom. If you wanna spend $750 send the money to me and I'll get you a good set of Cleveland, Chicago Latrobe, or Greenfield, then I get that car dealer commission and we're happy ? You might wanna pay a little extra and get a separate holder for each set. Numbers,fractions, and letters I think that's a little handier. The cobalt is if you're gonna do a lot of work in alloy steel tempered like 4140, 4240, etc. or mean stainless, 316, 304, 17-4, etc. The center of those drills are thicker and difficult to thin. You might also wanna think about a few over 1/2" like 5/8, 3/4, etc.
I find it easy to spend other peoples money don't I
dickr
 
I see the sets for $500, but those are HSS, I was looking at the cobalt sets.
 
dickr said:
I go with Tom. If you wanna spend $750 send the money to me and I'll get you a good set of Cleveland, Chicago Latrobe, or Greenfield, then I get that car dealer commission and we're happy ? You might wanna pay a little extra and get a separate holder for each set. Numbers,fractions, and letters I think that's a little handier. The cobalt is if you're gonna do a lot of work in alloy steel tempered like 4140, 4240, etc. or mean stainless, 316, 304, 17-4, etc. The center of those drills are thicker and difficult to thin. You might also wanna think about a few over 1/2" like 5/8, 3/4, etc.
I find it easy to spend other peoples money don't I
dickr
Click to expand...

There's no telling what metals I will be drilling. I know for sure I will be drilling a lot of 5/16" holes in 440c SS and also some titanium. I will most likely be drilling holes is drive shafts and such things. I will also use them to drill out bolts.

So there is about a $250 to $300 jump from HSS to cobalt, would it be worth the extra now, and I know I can drill whatever I want.
 
Jonathon,
You say you dont know what metals you will be drilling. Do you really need the 115 pc set of cobalt drills? Could you get a cheaper HSS set and just get the odd cobalt bit as you find the need?
Personally I avoid buying sets of anything where I can. Sure it costs more in the long run but you end up with better quality stuff and less of the things you never need or use.

Cheers Phil
 
Cobalt drills will definately be tougher than HSS but you don't need cobalt to drill anything you mentioned but Titanium. I bought my Precision Twist drill set 28 years ago, they have drilled 10's of 1000's of wholes in A2, D2, Anvaloy, 4140 both annealed and prehard, H13, P20, knak55 and Vicount 44, these last 3 are prehard materials of around 44 rockwell. Lots of 300 and 400 series Stainless over the years with no problem. I do this for a living and have for 30+ years and only a few times ever Needed cobalt drills. I say save your money and buy a quality set of polished HSS and forget it. Cobalt drills are also tougher to sharper as they are harder on the wheels.
 
Mr. McRuff hit the nail on the head. Like you said you're not sure what you'll be drillin so that tells me you'll not be cutting any amvar, hastelloy, inconel, or inconelx. Rocket ship materials. Get a set of the polished Cleveland, Chicago, Titex, etc. 440 stainless will be a real douzy to drill with cobalt because it's more of the CORRECT amount of pressure you put on it and the speed. You don't force your way through 440 or titanium. A QUALITY HSS drill sharpened correctly with a split center will go better than cobalt
IMO I think that's (in my opinion) Then like was suggested you can buy any cobalt if you really think you need it.
Gad that's long winded. !
dickr
 
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