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May 1998

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Subject:
From:
Paul Anderson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 14 May 1998 13:13:02 -0400
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text/plain
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text/plain (104 lines)
John:

Have you contacted PADS about this phenomenon or was your discovery the result of your
independent analysis of their version of 274X.  The reason I ask is that we are experiencing the
same difficulties but have been dealing with it on a case by case basis.  When we send out 274X
gerbers to our board  house, we always send along an aperture list just in case they have any
questions.  However,  without fail, several PWBs sent out recently have had some readability
issue.  We were writing it off to operator error at the board house, but now that someone else
(you) has mentioned PADS as the source of the problem, more questions are being formed.

We're using PADS PowerPCB 2.0 on WINNT and WIN95 for critical place and route, SPECCTRA 7.1 for
autorouting,  and CAM350 for post processing.  What format discrepancies have you identified
specifically?  Hopefully,  you  can give us some ideas of what to look for till we install 2.2.
One thing I've noticed recently was that thermal apertures sometimes have their inner and outer
diameter swapped.


Thanks,

Paul Anderson

Bauer wrote:

> Scott,
>
> PADS PowerPCB does have a problem writing the RS-274-X format. I believe
> this is to be
> corrected in the latest (2.2) release. To create a good RS-274-X file, I use
> PC-Gerber II. RS-274-X
> adds the aperture data to the beginning of the gerber file.
>
> John Bauer
> IDEO Product Development
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Scott Holthausen
> Sent: Thursday, May 14, 1998 8:59 AM
> To: [log in to unmask]
> Subject: [TN] Gerber format question
>
> Hello TechNet,
>
> Can someone explain the difference between the RS-274-D and RS-274-X gerber
> formats?
>
> As a secondary problem, I had a vendor ask me to send him a gerber file in
> RS-274-X format and when I looked at it with my gerber viewer, it looked
> different than the same file that was in RS-274-D format?  Is this a
> problem with my design package (PADS PowerPCB) or my gerber viewer (Lavenir
> ViewMate)?
>
> Any and all info is appreciated.  Thanks in advance.
>
> Scott Holthausen
>
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--
                        Have a Golden Day,

Paul Anderson
Amherst Systems Inc
[log in to unmask]
716-631-0610 x190
716-631-0629 (fax)
http://www.amherst.com/

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