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Disappearing Holes

tmd63

 Has anyone had holes that disappeared from the NC drill files when outputting a file from Allegro 16.3?

I have a board where I have placed a new component. The manufacturing drawing and drill tables show the new holes and hole counts are correct. But when I viewed the gerbers and drill in GCprevue, the new components holes had disappeared. I then double checked the NC drill file in notepad and they have definitely disappeared.

Has anyone seen this behaviour before?

  • oldmouldy
    Check the Padstack definitions and ensure that you have pads defined for the "start" and "end" layers for all the drilled holes. GCPrevue has its quirks but not being in the NC file points to the padstack definitions likely being at fault.
  • tmd63

     I have checked the start and end pads and they all appear fine.

    I have also noted that there appear to be a 'TOL' which refuses to follow the defined hole tolerances.

  • steve

    Check that the drill hole is defined correctly. If that looks OK then you will need to attach the .brd file so it can be debugged without guessing....

  • tmd63

     The drill holes appear to be correct. But as no-one here has signed an NDA and this is a public forum, I am not allowed to post the BRD file.

  • mcatramb91

    I know you stated that you reviewed the NCDrill file, and the holes are not present, but can you verify it one more time by generating a plot file from the NCDrill file then loading it into the design as an overlay.

    From a DOS Prompt type the following:   explot   your_ncdrill_file.drl

    This will generate an Intermediate Plot file (IPF) for the NCDrill file.  You can then load the .PLT file generated into your design using File > Import > IPF... and it can used as an overlay to verify which holes are missing.  The default location of the loaded plot data is under Class Manufacturing / Subclass Pen#  or you could re-target its load location but changing the Class and Subclass under the Options tab after selecting the .plt file and just before indicating a load point of the plot.

    Can you post the Padstack Summary report (Reports > Padstack Summary) for the padstack that is not generating points in the NCdrill file. (Tools > Padstack > Modify Design Padstacks) padstack

    Hope this helps,
    Mike Catrambone

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