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  1. #1
    Join Date
    Jan 2007

    My Bore has a taper ??

    Any ideas guy? (and Gals)
    when boring my bore diameter is coming out tapered.
    check lots of stuff on the machine and everything seems ok.
    when I bore 30mm to 60mm depth my bore comes out bigger, the deeper I go???
    At first I thought it was boring bar deflection, but that would cause it to be smaller diameter, the deeper I go....
    Any ideas???

  2. #2
    Gold Member
    Join Date
    May 2004
    How much taper? What lead-in angle on your tool? Tool could be digging in as it cuts. Could be misalignment of machine. Do you also get taper on OD? Could be part push off at a greater distance away from chuck. As the cut gets closer to the chuck it become more rigid.

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