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  1. #13
    Registered
    Join Date
    Mar 2009
    Posts
    1875

    Re: Roundness accuracy on PCNC 1100

    My 8 year old 1100 will cut a circle round within.0015. If it needs to be closer than that, I don’t want the job.

    I make one part for my model boat hardware that needs to be .4995/.5000. That’s an outside diameter so I use a boring bar turned backwards and run the spindle in reverse.

    Other than that, I’ll pass.

  2. #14
    Registered
    Join Date
    Jan 2007
    Posts
    1349

    Re: Roundness accuracy on PCNC 1100

    Quote Originally Posted by Steve Seebold View Post
    I use a boring bar turned backwards and run the spindle in reverse.

    Other than that, I’ll pass.
    I use a left hand boring bar in a boring head on my 1100 . On a hole the size of 1/2" diameter I drill first then bore undersize with the boring head then using a floating reamer holder ream to size.

    Don

    Insert left hand boring bar in boring head
    Attachment 422820

    Floating reamer holder.
    Attachment 422818

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