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Preparing NC Drill ouput from Protel for Olimex

Discussion in 'Electronic Design' started by Andrew, Apr 9, 2005.

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  1. Andrew

    Andrew Guest

    I am designing a PCB using Protel, which I intend getting prototyped using
    Olimex.

    The Protel PCB libraries all refer to finished hole sizes (for example
    0.8mm). Olimex require drilling information to be the unplated hole size
    and indicate that the finished hole size will be approximately 0.1mm
    smaller. Does Protel include finished hole sizes in its ouput files or does
    it take into account plating and select a drill size slightly larger than
    the finished size?

    If the former then presumably I have to edit all the component footprints to
    increase the indicated hole size to the actual drill size rather than the
    finished hole size (e.g. 0.9mm rather than 0.8mm). Is there an easy way to
    do that?
     
  2. James Meyer

    James Meyer Guest

    The drill file is an ascii text file with a list of all the drill sizes
    presented at the top of the file. It would be easy to use any text editor to
    adjust the drill diameters. If there are a large number of slightly different
    drill sizes, you can even combine several different sizes together into one size
    to reduce the total number of different drill sizes needed.

    Jim
     
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