The polygon issue can be tested very easily. Does Gerber plot this allege
illegal polygons.
If Gerber plots it the CAM software has a wrong error message, if Gerber
does not the CAM software is right.
It is not a definition problem or other esoteric stuff. Sometimes it is
important to get down the problem and away from philosophies.
Wolfgang
-----Original Message-----
From: Dave Roesler <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, October 15, 1998 6:27 AM
Subject: Re: [DC] RS274X format problem
>Gerry,
>
>I don't think that the RS 274X standard is the issue. This standard has
>been around for a long time. Generally, if there is a problem it is due to
>the interpretation of the standard by CAD and CAM system developers. I had
>a lot of experience with this issue because I ran a software development
>group who developed CAM and pre-production analysis software. We also
>owned a number of service bureaus. Therefore, I saw data from any number
>of CAD and CAM systems. As a service bureau we had to be able to read
>whatever was thrown our way regardless whether it matched the standard or
>not. Whenever possible, I would contact individuals who produced
>"incorrect" data to get them to put pressure on their software vendor to
>correct the problem.
>
>I have been involved in many meetings with CAD vendors including IPC
>sponsored events. Generally, the CAD vendors do not put much effort into
>output translators because good output is not viewed as a feature that
>sells more systems. They put their emphasis on routing, placement, etc.
>In more than one meeting I was told, point blank, that output did not get
>much development effort. As a result, many of the RS 274X outputs from the
>CAD systems, though correct per the format spec, are very poor.
>
>This leaves the CAM vendor with the responsibility of trying to read every
>flavor and interpretation of RS 274X. One of the biggest issues is
>polygons. CAM systems attempt to police valid polygons. They are required
>to do this because they must produce photoplotter output and, therefore,
>the polygons must match the requirements of the photoplotter. I would
>venture to guess that most of the polygons that VALOR CAM says are illegal
>would not plot if sent directly to the photoplotter. In this case, the CAM
>software must be robust enough to handle the illegal polygons and make them
>plottable. It is too bad that the CAM systems must compensate, but until
>we can get the CAD vendors to produce good output it is the way it has to
>be.
>
>Dave Roesler
>TRI-C Design, Inc.
>
>----------
>> From: Gerald G. Gagnon <[log in to unmask]>
>> To: [log in to unmask]
>> Subject: Re: [DC] RS274X format problem
>> Date: Thursday, October 15, 1998 7:20 AM
>>
>> Hi All
>>
>> The recent posts regarding RS274X have been very timely as I have seen a
>> rash of problems with a vendor not being able to read these files into
>> their VALOR CAM system due to "illegal polygon fills". I believe this
>> issue is different than the compositing issues from this thread. Other
>> board shops either do not seem to have the problem or have developed
>> suitable workarounds to keep their jobs going.
>>
>> What concerns me most is whether or not this is an RS274X standard
>> issue, a CAD RS274X translator issue, or a board shop CAM RS274X issue.
>>
>> Any comments?
>>
>> Regards
>>
>> Gerry Gagnon
>>
>> Interconnect Technology
>> AlphaServers Platform Development
>> 129 Parker Street
>> Mail Stop: PKO3-1/20C
>> Maynard, MA 01754-2198
>>
>> ' Phone: (978)493-1210
>> * Fax: (978)493-0941
>> * Email: [log in to unmask]
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Hawes, Adam [mailto:[log in to unmask]]
>> Sent: Thursday, October 15, 1998 3:35 AM
>> To: [log in to unmask]
>> Subject: Re: [DC] RS274X format problem
>>
>> Dennis,
>>
>> You're not alone.......
>>
>> Composite layers are when the CAM software uses several layers to create
>> one
>> artwork layer i.e. what exists as one layer in Allegro e.g. your power
>> plane
>> is made up of several layers in the CAM environment. (forgive me if you
>> already knew this!)
>>
>> The fabricator only has a limited number of layers available to play
>> with
>> and we have had a problem with RS274X, especially on boards with several
>> PWR/GND layers, where the fabricator has complained of not having enough
>> layers to complete all the composites.
>>
>> I believe there is a Skill routine on the Cadence Web site that allows
>> you
>> to reduce the number of layers needed for composites. I've never used it
>> so
>> I don't know how reliable it is or if it's any good. Other than that,
>> the
>> only thing I can suggest is that you talk to your fabricator.
>>
>> Hope this helps.
>>
>> Adam Hawes
>>
>> > -----Original Message-----
>> > From: Dennis Ward [SMTP:[log in to unmask]]
>> > Sent: Wednesday, October 14, 1998 12:49 AM
>> > To: [log in to unmask]
>> > Subject: [DC] RS274X format problem
>> >
>> > Hello,
>> >
>> > The fab house I'm using has encountered a problem importing my RS274X
>> > artwork.
>> > I believe their software is having a hard time compositing(?) the
>> power
>> > plane layers.
>> > I'm still unsure what exactly is happening - I plan on visiting them
>> > tomorrow and see
>> > first hand.
>> >
>> > My software (output) - Allegro designer - version 13
>> > Theirs (Input) - Tibor Davos - version unknown.
>> >
>> > Has anyone else experienced any difficulties with RS274X formatted
>> power
>> > and ground planes
>> > generated from Allegro??
>> >
>> > Any (I do mean ANY) help would be appreciated.
>> >
>> > Thanks
>> > Dennis Ward
>> > Net to Net Technologies
>> >
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