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[Drill Ident Drawing.drl vs Drill Data.gbr]

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  • Brad Levy

    The drill data drawing contains the information about the hole locations and tool (drill) sizes in machine-ready format. It is what is used in modern manufacturing processes.

    The drill ident drawing marks the position of each hole, but does so with a symbol (like a circle, square, triangle) and a letter code indicating which drill is to be used at that location. It was designed to produce a human-readable drawing when plotted. It is pretty much a hold-over from the old days and ways. If you were making a PCB at home, drilling the holes yourself (without specialized PCB production equipment), you might start with the drill bit corresponding to the first letter used on the drawing, drill all those holes, then switch to the bit for the next letter code, drill all those, etc.
    Here is an example of a drill ident drawing with two hole sizes (shown in pale green), overlayed with the drill data drawing (in red):

    Note that the symbols (circles, in this case) in the ident drawing are bigger than the actual holes to be drilled - they just mark the location.

    For comparison, the holes in the drill data drawing are actual size, and don't have a human-readable letter code indicating which drill to use for each hole.

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