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IndustryArena Forum > MetalWorking > MetalWork Discussion > Multiple diameter step drilled hole.

Thread: Multiple diameter step drilled hole.

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  1. 03-28-2012, 03:03 PM #1
    frogier
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    Question Multiple diameter step drilled hole.

    Hello All,

    I have a job with multiple diameter step drilled holes. The material is 316L SST, there are 3 different diameter holes at the same position... Hole 1 is a .3125 diameter 6.71 deep, hole 2 is a .500 diameter 4.75 deep and hole 3 is a .625 diameter 2.75 deep... We are going to use coolant thru carbide drills in a Mori Horizontal... My question is, in what order I should drill these holes (big to small or small to big)? Any feed back would be appreciated...

    Thanks
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  2. 03-28-2012, 03:47 PM #2
    Geof
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    Big to small; carbide drills should always cut along the full length of the cutting edge.
    An open mind is a virtue...so long as all the common sense has not leaked out.
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  3. 03-28-2012, 08:21 PM #3
    txcncman
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    Quote Originally Posted by Geof View Post
    Big to small; carbide drills should always cut along the full length of the cutting edge.
    +1 - Largest diameter first.
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