>-----Original Message-----
>From: Jeff Seeger [SMTP:[log in to unmask]]
>Sent: Thursday, March 25, 1999 9:23 PM
>To: [log in to unmask]
>Subject: Re: [TN] RS274X format...
>
>Matthew Lamkin wrote:
>>
>> many snips for brevity <
>>
>> Using GC-Prevue
>> make any last minute modifications that I had missed, make
>
> With you on the rest, in spirit anyway, but if some-
> one here tries this we take them out back and shoot
> them. Not even a ceremony! Only because we've had
> to revise boards where someone had done this...
>
>[Matt Says >>>] Of course, if the CAD file is available the alteration is
>done in that & then the Gerber file
>[Matt Says >>>] is re-created, what I meant is, I have often had only Gerber
>files because someone else
>[Matt Says >>>] did the PCB (I.E. in another country) and all I got was the
>gerber files, that had certain pad [Matt Says >>>] sizes too small. This was
>easily modified by copying the gerber, identifying the small pads,
>[Matt Says >>>] removing all the others and re-importing the new gerber,
>then merging with the first. It saves
>[Matt Says >>>] the big time gap between contacting the origional CAD/PCB
>person & having the changes [Matt Says >>>] done. Of course record of what is
>done is allways taken & applied to the CAD file afterwards.
>
>
>> some alterations that my CAD package could not,
>
> Sure hope you have a scripting facility in that tool...
>
>[Matt Says >>>] A scripting utility? what for, what would that do?
>[Matt Says >>>] My CAD package cannot create pads with a slot in them to
>prevent the solder flowing
>[Matt Says >>>] over them when wave soldered. However using GC-Prevue I have
>been able to do this with
>[Matt Says >>>] some clever manipulation of a bit of copper & layer merging.
>
>>
>> Before you ask, yes I do actually run software that is paid for. Now all
>> I want is Linux, "Cadstar for Linux", etc.
>
> Again with you in spirit but hope you're not holding
> your breath!
>
>[Matt Says >>>] No...
>
> Back to topic, I've seen difficulties w/274X - and the
> more complex the artwork the more likely the troubles.
>
>[Matt Says >>>] I only once had problems, I usually design them out. Custom
>apertures seemed to be
>[Matt Says >>>] my only problem, but only because I did not know how to
>create them (I do now).
>
> Primarily talking from experience w/Cadence, who really
> did write their outputs ***EXACTLY*** to the spec, and
> many CAM packages didn't read the deep heirarchy that is
> implicit in complex files very well. This is improving
> over time as all packages evolve. Have not had troubles
> in recent history.
>
> Regards,
>--
>
> Jeff Seeger Applied CAD Knowledge Inc
> Chief Technical Officer Tyngsboro, MA 01879
> jseeger "at" appliedcad "dot" com 978 649 9800
>
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