RS274X allows apertures defined internal to a file. There is no rules, that
same project files must have the same apertures. Decent Gerber viewers
and CAM software should allow for these situation.

We always should watch out that poor implementation of standards do not
reflect on the standard itself. Poor Gerber or EDIF implementation should
reflect on software companies, not on standards. It is time, that users 
tell their software vendors about these problems and make them fix it.

Wolfgang Schenke (714-721-1017)
[log in to unmask]


> From ipc.ipc.org!TechNet-request Fri Nov  1 06:42:51 1996
> Resent-Date: Thu, 31 Oct 1996 20:56:45 -0800
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> Date: Thu, 31 Oct 96 14:21:31 PPE
> From: [log in to unmask] ( Kevin Seaman )
> To: [log in to unmask]
> Subject: Re: DES- Gerber formats?
> Cc: [log in to unmask]
> Resent-Message-ID: <"lVjNN2.0.OJB.ttJUo"@ipc>
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> 
> HOWZITGOIN?
> 
> George Franck Jr wrote:
> 
> > Layer 1 and layer 2 both have separate, and sometimes
> > different aperture lists in X-Gerber (RS-274X).
> 
> This is not the way my RS-274-X converter works.  In fact, I
> have never heard of separate apertures for different gerbers
> (on the same board).  I would not tolerate this multiple
> aperture confusion regardless of whether I was using RS-274-D
> or RS-274-X.
> 
> This is NOT a problem with the standard of RS-274-X itself, 
> but rather just a poor implementation.  Do not let this 
> reflect negatively on using RS-274-X.
> 
> Please tell us the name of the software package that creates 
> this problem so we can all avoid it.
> 
> Thank you and have a FANTASTIC day!
> 
> Kevin L. Seaman (714) 221-4752
> [log in to unmask]
> 
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