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 Disappearing Holes 

Last post Tue, Feb 12 2013 6:12 AM by steve. 6 replies.
Started by tmd63 08 Feb 2013 05:59 AM. Topic has 6 replies and 1069 views
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  • Fri, Feb 8 2013 5:59 AM

    • tmd63
    • Top 200 Contributor
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    • Stonehouse, Gloucestershire
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    Disappearing Holes Reply

     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?

    The impossible we do straight away. Miracles take a little longer.
    • Post Points: 20
  • Fri, Feb 8 2013 6:23 AM

    • oldmouldy
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    Re: Disappearing Holes Reply
    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.
    • Post Points: 20
  • Fri, Feb 8 2013 7:13 AM

    • tmd63
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    Re: Disappearing Holes Reply

     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.

    The impossible we do straight away. Miracles take a little longer.
    • Post Points: 20
  • Mon, Feb 11 2013 8:28 AM

    • steve
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    Re: Disappearing Holes Reply

    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....

    • Post Points: 20
  • Tue, Feb 12 2013 5:33 AM

    • tmd63
    • Top 200 Contributor
    • Joined on Mon, Jul 23 2012
    • Stonehouse, Gloucestershire
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    Re: Disappearing Holes Reply

     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.

    The impossible we do straight away. Miracles take a little longer.
    • Post Points: 35
  • Tue, Feb 12 2013 6:09 AM

    • mcatramb91
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    Re: Disappearing Holes Reply

    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

    • Post Points: 5
  • Tue, Feb 12 2013 6:12 AM

    • steve
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    Re: Disappearing Holes Reply

    Try a Tools - Database Check, if this fails contact either Cadence or the Channel Partner you bought the software from an arrange to send the board file to them.

    • Post Points: 5
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Started by tmd63 at 08 Feb 2013 05:59 AM. Topic has 6 replies.