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February 2010

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Subject:
From:
Karen Tellefsen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Karen Tellefsen <[log in to unmask]>
Date:
Tue, 23 Feb 2010 08:53:50 -0500
Content-Type:
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text/plain (141 lines)
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                                                
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                                                                   Subject 
             02/22/2010 06:06          Re: [TN] Reading IPC-B-24 data      
             PM                        issues                              
                                                                           
                                                                           
             Please respond to                                             
             [log in to unmask]                                             
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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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