Re: gEDA-user: New Column: From the CAD Library

["Bert Timmerman" <bert.timmerman@xxxxxxxxx>]

Hi all, 

> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx 
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of Peter Clifton
> Sent: Saturday, February 05, 2011 3:49 PM
> To: gEDA user mailing list
> Subject: Re: gEDA-user: New Column: From the CAD Library
> 
> On Fri, 2011-02-04 at 08:17 -0500, Bob Paddock wrote:
> > "New Column: From the CAD Library
> > 
> > When creating a CAD library, there are dozens of things to consider 
> > that are often overlooked or not even considered that will directly 
> > affect the quality of part placement, via fanout, trace 
> routing, post 
> > processing, fabrication, and assembly processes. This 
> article, Part 1 
> > of a series, introduces aspects that should be considered when 
> > creating CAD library parts."
> > 
> > http://www.pcbdesign007.com/pages/zone.cgi?a=74214
> > 
> > Has tips worth considering.
> 
> Note that the series continues on his blog. It is VERY good, 
> and contains a lot of details I was looking for recently.
> 
> http://blogs.mentor.com/tom-hausherr/
> 
> --
> Peter Clifton
> 
> Electrical Engineering Division,
> Engineering Department,
> University of Cambridge,
> 9, JJ Thomson Avenue,
> Cambridge
> CB3 0FA
> 
> Tel: +44 (0)7729 980173 - (No signal in the lab!)
> Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)
> 

+1

I've been following Tom Hausherr's achievements (the formerly PCB-Libaries,
now Mentor Graphics) for a couple of years now, and I think that this blog
is mandatory reading before "Getting Started" with pcb design.

I would like to see some, if not all, of these "standards" reflected in the
pcb-lib some day _and_ these recommendations end up in the (gEDA) pcb
documentation, just to prevent "error 404" from happening.

Of course, there are others sources of information to read before putting
the first trace on a pcb, like app notes and part datasheets from vendors.

One of Tom's "issues" that is to be kept in pcb are most of the mil grids
because of the bazillion perf board and mil based parts on the market, to be
bought for cheap by hobby-ists, or for "Quick-and-Neat" proto boards (we
don't play or do dirty ;-).

Just my opinion on the subject.

Kind regards,

Bert Timmerman.



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