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March 1998

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Subject:
Re: Land Pattern and Component Modeling
From:
Jim Bauer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 26 Mar 1998 12:45:58 -0600
Content-Type:
text/plain
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text/plain (51 lines) 
My understanding is pin 1 was used as the orgin to help improve the ability to route using a grid
based router.  These days I don't think that is much of an issue with the newer gridless routers
that are available.  However if you have to do much hand routing and cleanup it is much easy to
maintain your spacing rules if you use a grid.  Hope this helps.
Regards,
Jim Bauer


Anthony Bundrant wrote:

>      Dear Fellow TechNetters:
>
>      Is the current trend to model component land patterns from the center
>      of the part or from pin/pad 1?  Whichever is the answer, what is the
>      justification for doing it that way?  We are embarking on a project to
>      automate conversion of PADS board layout to a 3-D Unigraphics assembly
>      model and the aforementioned issue is a critical one.
>
>      Thanks in advance for any help and advice.
>
>      Anthony Bundrant
>      Design Engineer
>      Bell Helicopter Textron
>      P.O. Box 482
>      Fort Worth, TX 76101
>      Phone: (817) 280-8903
>      E-mail: [log in to unmask]
>
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