Trouble with tight tolrance small hole

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Thread: Trouble with tight tolrance small hole

  1. #1
    Member Cncguy79's Avatar
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    Default Trouble with tight tolrance small hole

    Im trying to hold a .03 dia. hole .07 deep to +/- .0002. Only mill I have is a .025 2 flt with .08 loc. Using a .014 step down interpolating after a .025 drill. 18k rpm feeding at 1 ipm. Cannot get the taper any better than .0005. Any ideas?

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  2. #2
    Community Moderator Jim Dawson's Avatar
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    Default Re: Trouble with tight tolrance small hole

    Damn, that's a tough one. Maybe spiral down, maybe 0.01/rotation?

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: Trouble with tight tolrance small hole

    Why in the world are you trying to mill that? Drill with a short drill and ream. Try MA Ford "True Size" reamer. I have had great luck with them.

    Dave



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Trouble with tight tolrance small hole

Trouble with tight tolrance small hole