[PCB_FORUM] Re: RS-274X

Hey Richard,

 

Ok, so you also use a title block to identify the films. I'm sure it's made up 
of lines and text.

So whether you use a bounding box or photoplot outline to include this, the 
lines/text still come out as negative, right?

 

I don't see any way around this, so it's either put up with the lines/text as 
negative or go to positive inner planes.

 

For now, I'm going to put off the decision and stick with 274D (where even with 
the film defined as negative, the lines/text of the title block come out 
positive).

 

Thanks for the reply!

 

Gary

 

  

Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado

amd.com

gary.macindoe@xxxxxxxxxxxxxxxxxxxx Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of richard moffat
Sent: Wednesday, May 07, 2008 5:28 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: RS-274X

 

Hi

 

We use 274X, with title boxes on all layers.  Title blocks may be rare in the 
industry (I don't know) but I think they're important.

 

We ended up writing a script to change the photoplot outline for all 
negative/positive layers, generate what's necessary, and then back again, on 
the "Generate All" button.  Works really well, but better gerber generation 
should have been there in Allegro the first place.

 

Many people still use Gerber (as opposed to ODB++) for various reasons.  It 
would still be a reasonable ask to have Cadence implement something to fix 
this.  

 

Cheers,

Richard

 

 

__________________________

Richard Moffat

PCB Specialist Engineer

Allied Telesis Labs

ph. +64 (3) 3393000

richard.moffat@xxxxxxxxxxxxxxxxxxx

 

 

>>> On 8/05/2008 at 10:24 a.m., in message 
>>> <C457DF91B793174299A7B391C368EAD55FBFDDDD@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>, 
>>> <george.h.patrick@xxxxxxxxxxxxx> wrote:

 

 

That's him :)  Haven't seen hide nor hair of him since he retired.

 

Unfortunately, that's right.  All positive layers come out as negative images 
if the film control is set for a negative film.

 

Doesn't seem to me that it would be too difficult for Cadence to add an 
additional composite additive positive sub-layer to the gerber file in if you 
have a positive layer selected for a negative film control, but they have never 
done  it (unless it's in 16, I haven't tested for that).  But it is probably no 
bang for the buck, I think it is increasingly rare to have title blocks and 
such on films anyway.

 

-- 

George Patrick

Tektronix, Inc.

Central Engineering, EDS Applications Support

P.O. Box 500, M/S 39-512

Beaverton, OR 97077-0001

Å 503-627-5272 (voice)     Æ 503-627-5587 (fax)

http://www.tektronix.com    http://www.pcb-designer.com

 

"Off-Grid and Proud of it!"

-----Original Message-----

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary

Sent: Wednesday, May 07, 2008 14:10

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: RS-274X

 

 

Hey George,

 

By predecessor, I bet you mean Don Gillispie (did I spell his last name 
correctly?).

How's Don doing by the way? I worked with him (actually he supported us in 
Redmond) for some years at Tek.

 

I know about the photoplot outline, I used to use one just outside of the 
drawing title block.

So either way, with 274X output, everything becomes negative, right?

 

Thanks for the reply.

 

Regards,

Gary

 

 

Gary E. MacIndoe

PCB Design Engineer

Fort Collins, Colorado

amd.com

gary.macindoe@xxxxxxx

 

 

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of 
george.h.patrick@xxxxxxxxxxxxx

Sent: Wednesday, May 07, 2008 2:59 PM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: RS-274X

 

Gary:

 

You can also put a photoplot outline area around the stuff you want visible 
(Setup >Areas > Photoplot Outline) to get the same effect.  If you do NOT have 
this area, it ignores anything outside the board outline (unless you set the 
bounding box).

 

My predecessor put in an issue about this when we went to RS-274x back 6-7 
years ago.  They put it in the future-features pile (otherwise known as the 
round file) and I guess it remains there to this day.  I have never attempted 
to resubmit it.  

 

-- 

George Patrick

Tektronix, Inc.

Central Engineering, EDS Applications Support

P.O. Box 500, M/S 39-512

Beaverton, OR 97077-0001

Å 503-627-5272 (voice)     Æ 503-627-5587 (fax)

http://www.tektronix.com    http://www.pcb-designer.com

 

"Off-Grid and Proud of it!"

-----Original Message-----

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary

Sent: Wednesday, May 07, 2008 13:43

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: RS-274X

Hey man,

 

Thanks for the idea. Yeah, it sort of worked. I set the Bounding Box to 2100 
(mils).

The gerber for this negative layer now included my targets and film description 
box, but they are negative.

 

With RS-274D, the negative layers still had the lines and text of the 
targets/film description box (of course outside of the board outline) as 
positive.

 

Thanks again, this may be better than not getting them at all if I do indeed 
decide to go to 274X.

 

Regards,

Gary

 

 

Gary E. MacIndoe

PCB Design Engineer

Fort Collins, Colorado

amd.com

gary.macindoe@xxxxxxx

 

 

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Man Tran

Sent: Wednesday, May 07, 2008 2:14 PM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: RS-274X

 

Gary,

 

Try to set Shape Bounding Box in Artwork Control Form and make sure this number 
(measure from board's outline) large enough to cover any lines & text that you 
want to show.

 

-man

 

 

 

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary

Sent: Wednesday, May 07, 2008 1:08 PM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] RS-274X

 

Hey guys,

 

Allegro PCB 15.5.1, Expert license, Windows XP Pro

 

Ok, RS-274X question.

 

I like negative inner planes, and include targets (lines) and a film 
description box (lines and text) below the board.

 

I notice that when I gerber out negative plane film in RS-274X format, I don't 
get the targets (lines) nor the film box (lines and text).

I see the same results whether I load the gerbers into an Allegro database or 
CAM350.

 

Is there any way to get the lines and text on a negative film with RS-274X?

 

Thanks for any help!

 

Gary

 

 

Gary E. MacIndoe

PCB Design Engineer

Fort Collins, Colorado

amd.com

gary.macindoe@xxxxxxx

 

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