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IndustryArena Forum > MetalWorking > General MetalWork Discussion > Peck drilling larger diameter holes on smaller CNC.
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  1. #1

    Join Date
    Jan 2021

    Peck drilling larger diameter holes on smaller CNC.

    Hi Gent and Gentents!

    I'm newer to machining and I'm trying to accurately ream a .407 hole in aluminum about 2.3" deep. I have an LMS x2 mini mill converted to cnc that although has an upgraded motor, still struggles with a 9.7mm drill bit. I was wondering if I could spot drill, drill a 1/4" hole, then use the 9.7 drill. Would this still make an accurate hole? I need the location to be within .0005 (which the machine is capable of). Any input would be awesome! Thanks.


  2. #2
    Join Date
    Dec 2003

    Re: Peck drilling larger diameter holes on smaller CNC.

    Try it on a piece of scrap?Doesn't appear to be an easy task and it presumes the drill bit is exactly what it claims to be.Do you have a small boring head?Again,a test cut would be wise.

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