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IndustryArena Forum > Material Technology > Hard / High Speed Machining > Drill holes at an angle in superalloy....and deep too
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  1. #1
    Join Date
    Jul 2007
    Posts
    72

    Drill holes at an angle in superalloy....and deep too

    We have a upcoming project in A286 iron base superalloy HRC 32 flat stock
    (30) .276" holes drilled 1.25" deep at a 50 deg angle to cross holes
    and
    (42) .197" holes drilled 1.05 deep at a 60deg angle to cross holes

    Should I pre drill with a short drill first or go in with an endmill and make a flat

    Also we are considering drilling deep holes in this part
    (2) .313dia 17.23 deep
    (4) .375dia 17.3 deep

    Any advice on sfm and chipload on carbide drills would be appreciated, along with any other things to look out for.
    I'm just a butcher masquerading as a machinist

  2. #2
    Join Date
    Jan 2005
    Posts
    15362

    Re: Drill holes at an angle in superalloy....and deep too

    Quote Originally Posted by gogego View Post
    We have a upcoming project in A286 iron base superalloy HRC 32 flat stock
    (30) .276" holes drilled 1.25" deep at a 50 deg angle to cross holes
    and
    (42) .197" holes drilled 1.05 deep at a 60deg angle to cross holes

    Should I pre drill with a short drill first or go in with an endmill and make a flat

    Also we are considering drilling deep holes in this part
    (2) .313dia 17.23 deep
    (4) .375dia 17.3 deep

    Any advice on sfm and chipload on carbide drills would be appreciated, along with any other things to look out for.
    You have to make a flat the dia of the drill you will be using, spot drill then drill your hole

    For your deep holes you will have to Gun drill them
    Mactec54

  3. #3
    Join Date
    Jul 2007
    Posts
    72

    Re: Drill holes at an angle in superalloy....and deep too

    How about feeds and speeds for drilling and milling
    I am seeing about 30 sfm and .002"ap for tooling around 3/8" or a little smaller?
    Also seems that hss steel is used more often than carbide.
    I'm just a butcher masquerading as a machinist

  4. #4
    Join Date
    Jan 2005
    Posts
    15362

    Re: Drill holes at an angle in superalloy....and deep too

    Quote Originally Posted by gogego View Post
    How about feeds and speeds for drilling and milling
    I am seeing about 30 sfm and .002"ap for tooling around 3/8" or a little smaller?
    Also seems that hss steel is used more often than carbide.
    I think you will find something close enough in this PDF
    Attached Thumbnails Attached Thumbnails GuideToMachining2002.pdf  
    Mactec54

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