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Good drill bits?

  1. #1
    Lifer Garandman's Avatar
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    Good drill bits?


    Had to drill holes in some thick wall stainless steel stanchions. Quickly learned the sundry drill bits I have suck. And I even have cutting fluid.....

    What is a good/very good/freakin awesome fractional drill bit set up to 1/2"?

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  2. #2
    Resident Turkey Tricky Mike's Avatar
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    Re: Good drill bits?

    The fact that you're dealing with stainless probably has as much, if not more to do with your difficulties than the shitty drill bits do.
    Fun stuff.
    Cobalt (or carbide of you have the machinery to use it).
    Speed and feed is crucial. As soon as the bit stops cutting and starts rubbing you're kind of screwed.

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  3. #3

    Re: Good drill bits?

    Quote Originally Posted by Tricky Mike View Post
    As soon as the bit stops cutting and starts rubbing you're kind of screwed.
    oh snap

    kinda

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  4. #4
    Lifer Garandman's Avatar
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    Re: Good drill bits?

    Irwin Cobalt?

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    Angry Gumball RandyO's Avatar
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    Re: Good drill bits?

    I'd like to find a good set of reverse twist bits for screw/bolt extraction

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  6. #6
    Lifer Falko's Avatar
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    Re: Good drill bits?

    If you are using a press and securing the part, carbide. If you are using a hand drill or the part can move, carbide tipped.

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  7. #7
    Lifer Garandman's Avatar
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    Re: Good drill bits?

    Small drill press.

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  8. #8
    Your Father csmutty's Avatar
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    Re: Good drill bits?

    If you're using a hand drill (which I'm assuming you are) then hsco (high speed cobalt) with a tin (titanium nitride) coating is going to be your best bet. If you have access to a drill press it is going to make all the difference. Feeds and speeds as mentioned are going to be crucial. So the rpm of the drill and how many inches per revolution the drill is going into the work are the controlled factors. On a hand drill you aren't really going to be able to control them that well.

    The other thing you're going to want to think about is the drill point angle. Most drill point angles (general purpose) are 118° included angle. For harder materials like stainless you're going to want an included drill point angle of 135-140°. This is in part because for drills of the same outside diameter a drill with a greater drill point angle is going to be cutting less effectively because the hypotenuse (cutting lip) is shorter. It therefore requires less torque to operate and will generate less heat.

    Here are some examples. These are bright finish (uncoated) because the TiN coating made the price jump up to $300+, and I am guessing that is more than you want to pay.

    15 piece kit:
    1/16 to 1/2", 135deg Point, Bright Finish, 01196153 - MSC

    29 piece kit:
    1/16 to 1/2", 135deg Point, Bright Finish, 63323570 - MSC

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    Last edited by csmutty; 07-18-17 at 03:48 PM.
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  9. #9
    Lifer Garandman's Avatar
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    Re: Good drill bits?

    I got the pilot holes drilled (using a small drill press) and some of the larger ones. Think the speed was right, and used cutting fluid.

    These are the bits I plan to buy unless anyone suggests something better.

    29 Piece Cobalt M-35 Metal Index Drill Bit Set - Tools - IRWIN TOOLS

    Those are close to $100. Their really good ones are over $200.

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    Last edited by Garandman; 07-19-17 at 12:43 AM.
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  10. #10
    Lifer DaveZX6r's Avatar
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    Re: Good drill bits?

    Don't pilot drill in steel you will tear the corners off the drill. Just spot your holes and then drill with what you've got. What grade stainless is it?

    Irwin should be fine for you don't go baller unless you are buying singles. You are on a time line drilling stainless.
    As said speeds feeds and cutting fluid will do more for your drill life than baller drill brands. Assuming you are at least using a decent drill grade to begin with.

    Oh and unless you are buying really good drills just get regular chisel points. Split points drill great but don't hold up as well.

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    Last edited by DaveZX6r; 08-18-17 at 12:20 PM.
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  11. #11
    Lifer Garandman's Avatar
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    Re: Good drill bits?

    Only used the Irwin bits once, worked well.

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  12. #12
    Your Father csmutty's Avatar
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    Re: Good drill bits?

    Quote Originally Posted by DaveZX6r View Post
    Don't pilot drill in steel you will tear the corners off the drill. Just spot your holes and then drill with what you've got. What grade stainless is it?

    Irwin should be fine for you don't go baller unless you are buying singles. You are on a time line drilling stainless.
    As said speeds feeds and cutting fluid will do more for your drill life than baller drill brands. Assuming you are at least using a decent drill grade to begin with.

    Oh and unless you are buying really good drills just get regular chisel points. Split points drill great but don't hold up as well.
    If you are going to spot make sure that the spot drill has an angle that is less than the drill. HSS drills like to be guided into the hole while self centering carbide units are more rigid so hitting center first is optimal.

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  13. #13
    Lifer DaveZX6r's Avatar
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    Re: Good drill bits?

    Garandman. I don't know if you drive past Lowell on your way up to Goshen. But industrial tool supply has great prices and alot of really good people.

    Industrial Tool Supply - We make it happen!

    We get all our stuff there. You may get a better value just telling them.what you need and getting a quality import set rather than buying an Irwin set. Also if you know you are going to be drilling a bunch of the same size you may be better served just buying a sleeve of them rather than a full set. As soon as you start ss your kind off on borrowed time for that drill.

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    "You don’t need to tell me the horror story about your uncle’s buddy who wiped out his chopper while drag racing at some hooligan rally. That just makes me wish I were talking to your uncle’s buddy instead of you. He sounds pretty cool."

    Originally Posted by JalopySiR
    BWAHAHAHAHAHA!! This time I was laughing at you. Sorry.

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