Surface mount pick and place machines use the component center to pick up
the part and place it on the board. Data which references the component at
pin 1, must and is converted to the component center before the board is
processed by the machine, typically by hand.

Regards,
Brant McClelland
Design Center,
Solectron Texas
[log in to unmask]



> ----------
> From:         Anthony Bundrant[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Thursday, March 26, 1998 8:53 AM
> To:   [log in to unmask]
> Subject:      [TN] Land Pattern and Component Modeling
>
>      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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