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118° vs. 135° point angles on twist drills.

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  • 118° vs. 135° point angles on twist drills.

    It's time to buy a new set of drill bits for the Gadget Garage. Everything I have now is sharpened to a 118° included angle. What's the wisdom in 135° points? I've never had problems with the 118°'s, but I've never used 135°'s. What would you guys buy and how come?

    Thanks, as usual!

    Hank
    ...from the Gadget Garage
    Millermatic 210 w/3035, BWE
    Handler 210 w/DP3035
    TA185TSW
    Victor O/A "J" series, SuperRange

  • #2
    hankj, 118 is the most efficient angle for drilling metal, 135 is better for harder steels/stainless. There are some 135 premium bits out there that are really bad, they tend to make an oval hole, I bought some Bluemole bits that did that. I would stick with the 118's, and maybe consider a 'screwmachine' length over Jobber length as they are 1/2 the length and don't tend to flex or break as easy. Hope this helps, Paul
    More Spark Today Pleasesigpic

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    • #3
      hey hank go the extra mile and get cobalt.
      Trailblazer 302g
      coolmate4
      hf-251d-1
      super s-32p
      you can never know enough

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      • #4
        Thanks, guys.

        I like screw machine length for that reason - stiff! I'm looking at a USA set from ENCO from 1/16" to 1/2" by 64ths. All my large bits are in good shape, and I'm glad, 'cause them bad boys are EXPENSIVE!

        Hank
        ...from the Gadget Garage
        Millermatic 210 w/3035, BWE
        Handler 210 w/DP3035
        TA185TSW
        Victor O/A "J" series, SuperRange

        Comment

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