At 09:30 AM 6/26/01 +0100, Andy Gulliver wrote:
>That's exactly what I meant. I've seen people really foul up boards by
>getting this wrong (imagine a 16-slot backplane...).
What was confusing to me was "absolute coordinates," which in Protelspeak
refers to database coordinates referenced to workspace 0,0, as distinct
from "relative coordinates," based on the user origin or, with gerbers, on
film center, perish the thought.
I'd have used this language: "make sure to place the pad locations
according to true metric location translated into mils and rounded off,
instead of converting the pad spacing to mils and then repeating that
distance, which would usually generate a significant accumulated error."
This can be done manually in the library by placing the pads in metric and
then changing to imperial grid and editing the pads to round off the x,y
mil numbers to integers.
For a part with many pads, one could make a single-pad component, place it
on a PCB in a metric array, and then use Tools/Interactive Placement/Move
to Grid (with grid set at 1 mil) to do the round off automatically. This
does round to nearest mil, it does not truncate. Then the Components may be
exploded to primitives and cleaned up and copied to a footprint.
Problem is, Protel does not have a good renumbering tool that will quickly
renumber already placed pins, at least not as far as I know.... Tango DOS
had one, it was one click per pin, numbering according to a user-defined
pattern and increment. (Such as A? with increment 2, starting number A3,
would number A3,A5,A7,A9,A10, etc.) It could be used to number pads or
components.
[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* To post a message: mailto:[EMAIL PROTECTED]
*
* To leave this list visit:
* http://www.techservinc.com/protelusers/subscrib.html
* - or email -
* mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum
*
* Contact the list manager:
* mailto:[EMAIL PROTECTED]
*
* Browse or Search previous postings:
* http://www.mail-archive.com/[email protected]
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
