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February 2010

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Subject:
From:
Douglas Pauls <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 23 Feb 2010 15:28:35 -0600
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The B-24 Rev B files do have the fiducials included to make solder paste 
stenciling easier.

Doug Pauls



Karen Tellefsen <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
02/23/2010 08:00 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Karen Tellefsen <[log in to unmask]>


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Subject
Re: [TN] Reading IPC-B-24 data issues






Additionally, the IPC gerber data does not have fiducials.  This makes
printing paste even more interesting.

Actually, some of the off the shelf coupons are a tiny bit skewed, which
doesn't really affect the measurement, but this makes printing solder 
paste
very interesting.  Also, the IPC's artwork does not include a file for a
solder paste stencil.  I usually make my own artwork from the details 
given
in the test methods.

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



 
             Ahne Oosterhof 
             <[log in to unmask] 
             >                                                          To 

             Sent by: TechNet          [log in to unmask] 
             <[log in to unmask]>                                          cc 

 
                                                                   Subject 

             02/22/2010 06:06          Re: [TN] Reading IPC-B-24 data 
             PM                        issues 
 
 
             Please respond to 
             [log in to unmask] 
                    com 
 
 




The extension *.gbr hints that you are dealing with Gerber 274D type 
files.
That means the data file (holding the locations of the apertures) and the
apertures shape/size file are separate. Several PCB and stencil design
programs can read 274D by importing first the Aperture.txt file using the
appropriate library information followed by importing the data file.
A more modern and easier to read combined data/aperture file comes as
Gerber
274X and has the extension *.gbx.

Let me know if you need any help.

Having fun,
Ahne.
503-970-9814


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Monday, February 22, 2010 08:24
To: [log in to unmask]
Subject: [TN] Reading IPC-B-24 data issues

Good Morning,

I will preface this with a statement that I am not a PCB designer, and I 
do
not run the PCB design software we use.

That being said, I am attempting to have IPC-B-24 PCBs made by our PCB
vendor instead of buying them off-the-shelf.

I purchased the IPC-A-24G artwork direct from IPC, and it came on a disc.
Two PCB houses and the stencil house have all responded it is unreadable.

The disc has ZIP file with the following:
IPC-A-24G Master Drawing (PDF).  This indicates original design was done 
by
Magnavox in 1990.
Dcb24l01
Dcb24lst
cd2401.gbr
dc24lst.gbr
Aperture.txt

My PCB people are telling me the files won't even auto-import (automatic
format detection) into CAM software.

Has anyone else run into this issue and know a solution?

Thanks,

Kevin Glidden

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