Homebrew PCBs

From: "Mark Lerman" <mlerman@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, March 24, 2008 4:47 PM
Subject: [Homebrew_PCBs] board for testing


> Does anyone have a board file they use to test various methods of pcb
> production that they wish to share? I am attempting a novel approach
> to pcbs - details later if it works - and would like to be able to
> measure trace widths, etc without reinventing the wheel. Thanks for any 
> help.

I'd just create a board with tracks covering, say, 8 mils to 20 mils.

Leon
--
Leon Heller
Amateur radio call-sign  G1HSM
Yaesu FT-817ND transceiver
Suzuki SV1000S motorcycle
leon355@...
http://www.geocities.com/leon_heller

>--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
> > Does anyone have a board file they use to test various methods of pcb
> > production that they wish to share?
>
>http://www.delorie.com/pcb/
>
>Scroll down to "Goodies" and download the bloat test board (various
>formats available).  That's what I use for testing all my etch method
>changes.  It has lines and spaces from 1.6 to 12 mil, plus a range of
>holes and annuluses (annulii?).
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

>Perfect, thanks. I'll let you all know how it goes.
>
>Mark
>
>At 05:48 PM 3/24/2008, you wrote:
> >--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
> > > Does anyone have a board file they use to test various methods of pcb
> > > production that they wish to share?
> >
> >http://www.delorie.com/pcb/
> >
> >Scroll down to "Goodies" and download the bloat test board (various
> >formats available).  That's what I use for testing all my etch method
> >changes.  It has lines and spaces from 1.6 to 12 mil, plus a range of
> >holes and annuluses (annulii?).
> >
> >
> >------------------------------------
> >
> >Be sure to visit the group home and check for new Links, Files, and Photos:
> >http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

>
> 
> You wouldn't have that in a form Eagle can read, would you?
> 
> Mark

>From: javaguy11111 <javaguy11111@...>
>Sent: Mar 24, 2008 8:32 PM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Re: board for testing
>
>This perl script will generate  what you need for eagle. I used it
>generate a pattern for my photoresist testing.
>
>
>$width=.001;
>$offset=.01;
>$step=2*$width;
>$length=1;
>$x=0;
>for($i=0;$i<10;$i++){
>	for($j=0;$j<5;$j++){
>		print qq(wire $width ( $x 0) ($x $length)\;\n);
>		$x+=$step;
>	}
>	$x+=$offset;
>	$width=$width+.001;
>	$step=2*$width;
>	
>}
>
>--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
>>
>> 
>> You wouldn't have that in a form Eagle can read, would you?
>> 
>> Mark
>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

On Tue, Mar 25, 2008 at 5:33 AM, Mike Schoenborn <rtfm@...> wrote:
> At 12:47 PM 3/24/2008 -0400, you wrote:
>
> >... and would like to be able to measure trace widths, etc
> >wthout reinventing the wheel.
>
> Has anyone looked into "IPC-9251"?
>
> http://dcchapters.ipc.org/html/downloads.htm
>
> ---------------------------------------------------------------
> [from the web page...]
>
> IPC-9251
> Test Vehicles for Evaluating Fine Line Capability
>
> Conductor Analysis Technologies, Inc. and E. I. DuPont Company
> developed test patterns for evaluating fine line capabilities, and
> IPC has been provided permission to distribute the data to the
> industry. The effort has been coordinated by the Etch and Strip
> Subcommittee (4-15) of the Fabrication Processes Committee (4-10)
> of IPC and is now being made available to industry for free. You will
> be asked to complete a short information form before downloading.
>
> Download IPC-9251 (.zipped file)
> [ http://dcchapters.ipc.org/html/9251form.htm ]
>
> ---------------------------------------------------------------
> [from the pdf included in the downloaded zip...]
>
> The files are named IPC221.ZIP and IPC441.ZIP. Both designs are 18- by
> 24-inch with 352 one-inch-square modules arranged in 16 rows and 22
> columns. IPC221.ZIP has multi-pitch modules with 2-, 3-, 4-, and 5-mil
> lines separated by 2-, 3-, and 4-mil spaces, respectively; IPC441.ZIP
> has multi-pitch modules with 4-, 5-, 6-, and 7-mil lines separated by
> 4-, 5-, and 6-mil spaces, respectively. Each design contains an aperture
> list and a "README" file that describes the pattern, and provides
> recommended processing procedures.
>
> The IPC441 design is useful to evaluate process uniformity, while the
> IPC221 design is intended for evaluating narrow lines and spaces. Both
> patterns may be inspected optically or tested electrically. Precision
> electrical resistance measurements from the patterns can provide
> conductor and space defect density, and conductor width and height
> uniformity.
>
> ---------------------------------------------------------------
>
> The idea is to  run off a batch of  these boards then send them (along
> with some number of $US) to a testing service who will evaluate them and
> return a report of their quality.  If you're making boards for sale to
> NASA/ESA/CSA/JSA, such a report might come in handy.
>
> bad: they're Gerber files
> good: "... tested electrically" (check out the patterns)
> bad: "...18- by 24-inch"
> good: "...one-inch-square modules"
>
> I believe one of the 1" module patterns would be worthwhile for
> evaluating the work done here; the idea of using precise resistance
> measurements to qualify a board is intriguing.
>
> I wanted to extract one of the modules from the huge design, but by the
> time I found a workable Gerber viewer and sorted out aperature issues, I
> had lost my ambition to hand-edit/awk the files.   Recreating the
> patterns programmatically is left as an exercise for javag^H^H^H^H^H the
> student.
>
> I thought I first heard about IPC-9251 in one of the Riston spec sheets,
> but can't find the reference right now.  If I can find the time I'll
> contact CAT/IPC/DuPont to see how they would feel about allowing a copy
> of their files here for our reference.
>
> Mike
>
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>