> One example of this is the fact that SMT components in Protel libraries are
> designed and placed using pin one of the device for reference. This is a
> gross oversight, SMT devices should be designed and placed with the device
> body center as the reference location.

This is an issue that comes up quite often and seems to become 
one of those religious type of debates. Those in the process of 
placing and manually routing preferring a pin origin and those 
CAMming out, wanting the centroid.

Maybe I'm missing something here, but the solution seems pretty 
obvious to me. In these days of "make the data as big as 
possible", the pickup point should be a seperate attribute of any 
footprint. The library editor should have an option of 
a) Pickup point defaults to pin1
b) Pickup point defaults to calculated centroid.
and accompanying functions to move the point manually or to 
select the other position.

The pickup point is an item in the shape of an arrow on its own 
layer. Not only can you see the orientation, but you can print it out 
for visual confirmation. Some of my work involves working with 
libraries from other companies and getting a meaningful P'n'P file is 
a pain with components oriented randomly in the library.

Comments ?

Steve.



======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: [EMAIL PROTECTED]      fax +64 9 820-1929
======================================================



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