Drill Recommendation From your experiences
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  1. #1
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    Default Drill Recommendation From your experiences

    Looking for reccomendations on your guys favorite drills/inserted drills.

    Will be used in a live tool lathe. Axial and radial holes both .3125 diameter not very deep maybe .500.

    Material is 303 stainless. tolerance is plus/minus .002

    Looking to tool up for decent size production runs.

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    My go to brand for solid carbide. Good product, great prices, great performance. Never used one of these in this size (5/16" is bigger than most of my bar stock), but I've used their tiny drills, and they're awesome.

    https://maford.com/product-details/20631250A

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    For 5/16 I would go with solid carbide. Indexable under 1/2 dia are kinda problematic. At least from my experiences.

    These work good....
    Solid Carbide G3 Series Drill .3125 diameter X 1.457 Flute Length TiAlCN MariTool

    Also these are even better, just more expensive..

    Solid Carbide CJT Series #114A Drill .3125 dia X 1.438 flute MariTool

    These are your best choice, only if your live tools have coolant thru..

    Solid Carbide Coolant Thru Drill 294A Series .3125 Diameter MariTool


    For the first 2 I would run 230 sfpm and .0045 feed per tooth.
    I am assuming normal to bad 303 stainless. If 303MAX or some other version of a free machining stainless increase 20%.

    First peck after 1X diameter, after that peck every .6X diameter.

    For coolant thru 250sfpm and .005 ipt.

    Good luck.

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    Quote Originally Posted by randyt88rsb View Post
    Will be used in a live tool lathe. Axial and radial holes both .3125 diameter not very deep maybe .500.
    Material is 303 stainless. tolerance is plus/minus .002
    We run a LOT of production stainless 303/316 parts. Our favorite is from YG and called a 'Dream Drill'. You can get them in inch or metric. Through-coolant wherever you can. You might consider a 7.9mm (0.311) for 0.3125 +/-0.002.

    I'd also keep in mind the "drill rules":

    1) When you need it to be under the drill will cut over.
    2) When you need it to be over the drill will cut under.
    3) When you don't care it'll cut right on size.

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    Quote Originally Posted by aj View Post
    I'd also keep in mind the "drill rules":

    1) When you need it to be under the drill will cut over.
    2) When you need it to be over the drill will cut under.
    3) When you don't care it'll cut right on size.
    Don't forget these rules.

    If you buy 1 drill it will break just before you are done with the job.
    If you buy 2 or more drills that one drill will run the entire lot and finish the job.

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    Kennametal GoDrill 8mm. Lasts forever. Can be run very fast. For the shallow holes you suggest it will do wonders. I'd start at Vc 40 and F0.1 conservatively.

    So: S1600 F160.

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    Guhring is my go to for tough applications and production work.

    However, that being said, I made tons of chips with YG Dream Drills in Tool steel.

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    Also, get a high quality holder for those drills. The tool is only as good as the holder.

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    Quote Originally Posted by fmari --MariTool- View Post
    Don't forget these rules.

    If you buy 1 drill it will break just before you are done with the job.
    If you buy 2 or more drills that one drill will run the entire lot and finish the job.
    That's a fact, Jack!

  14. #10
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    Quote Originally Posted by aj View Post
    We run a LOT of production stainless 303/316 parts. Our favorite is from YG and called a 'Dream Drill'. You can get them in inch or metric. Through-coolant wherever you can.
    I second the "Dream Drills" from YG. Run at higher feed rates too then others I've checked into.


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