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New stencil layer

Gustav_M

Hi

 

This is a suggestion that I am al already using and will continue to use

for the future.

 

 

For every component that I am using I have defined a stencil cut out for

each pad (only using SMD components).

 

The stencil cut out is defined in layer 53 (renamed to tStencil) and layer

54 (bStencil).

 

The advantage of this approach is two fold: (1) the reduction is done once

and for all and does not require manual work from on the stencil supplier.

(2) There are places where the stopmask is open, but the PCB does not

require solder paste. This is typically connectors, and through holes that

are only used for testing in development but not for production.

 

I wish to share this with Cadsoft, because I hope that the standard

libraries will be updated and upgraded with stencil layer.

 

Also note how Texas Instruments are beginning to include a 'recommended

stencil' with their recommend foot print.

 

PS: I have even defined a stencil frame cutout as a special component. This

matches exactly the stencil holding frame that is used in production.

Again, this removes a source of error and manual editing by the company

that produces the stencil.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

 

Parents

  • Gustav schrieb:

     

    No, I didn't know that.

     

    Are you suggesting, that the cream layer is used for stencil?

     

    Yes, that's exactly what that layer is for.

    And normally, all SMD pads automatically generate implicit information

    on that layer (if not disabled), based on the masks settings in the DRC.

    It's quite similar to the solder stop masks.

     

    Tilmann

     

  • in reply to e14 Contributor

    On 10/12/2011 05:24 AM, Gustav wrote:

    No, I didn't know that.

     

    Are you suggesting, that the cream layer is used for stencil?

     

    I think, that if you make the stencil automatically from the stop mask or

    any other layer, then you will not get it right.

     

    If you have a link to the documentation of common practice of how to make

    the stencil, I am interested to see it.

     

     

    Good morning, Gustav,

     

    Using a good old fashioned, home grown, red-blooded, all American, plain

    text editor like vim, emacs, or even notepad, add these lines to the

    section near the top of your .cam file:

     

    Section=BotPaste

    Section=TopPaste

     

    ... and add the following two sections to the end of your .cam file:

     

    Name="Bottom Solder Paste"

    Prompt=""

    Device="GERBER_RS274X"

    Wheel=".whl"

    Rack=""

    Scale=1.000000

    Output="ParNumber-RevX-BottomPaste.gbr"

    Flags="0 0 0 1 0 1 1"

    Emulate="0 0 0"

    Offset="0.0mil 0.0mil"

    Sheet=1

    Tolerance="0.000000 0.000000 0.000000 0.000000 0.000000 0.000000"

    Pen="0.0mil 0.000000"

    Page="12000.0mil 8000.0mil"

    Layers=" 32"

    Colors=" 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 6 6 4 8 8 8 8 8 8 8 8 8 8 8 8 8

    4 4 1 1 1 1 3 3 1 2 6 8 8 5 8 8 8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 2 4 3 6 6 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 0"

     

    Name="Top Solder Paste"

    Prompt=""

    Device="GERBER_RS274X"

    Wheel=".whl"

    Rack=""

    Scale=1.000000

    Output="ParNumber-RevX-TopPaste.gbr"

    Flags="0 0 0 1 0 1 1"

    Emulate="0 0 0"

    Offset="0.0mil 0.0mil"

    Sheet=1

    Tolerance="0.000000 0.000000 0.000000 0.000000 0.000000 0.000000"

    Pen="0.0mil 0.000000"

    Page="12000.0mil 8000.0mil"

    Layers=" 31"

    Colors=" 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 6 6 4 8 8 8 8 8 8 8 8 8 8 8 8 8

    4 4 1 1 1 1 3 3 1 2 6 8 8 5 8 8 8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 2 4 3 6 6 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

    1 1 1 1 1 1 0"

     

    Hope this helps.

     

    Enjoy,

        - Chuck

     

  • in reply to e14 Contributor

    Good morning Chuck,

     

    Here in Denmark it is late night already.

     

    Maybe I should have posted my suggestion under support, but with all due

    respect the vim editor is written by Bram Moolenaar (born in 1961, in

    Lisse, province of Zuid-Holland, Netherlands). That is not "home grown,

    red-blooded, all American"...

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

  • in reply to Gustav_M

    On 10/12/2011 01:47 PM, Gustav wrote:

    Good morning Chuck,

     

    Here in Denmark it is late night already.

     

    Maybe I should have posted my suggestion under support, but with all due

    respect the vim editor is written by Bram Moolenaar (born in 1961, in

    Lisse, province of Zuid-Holland, Netherlands). That is not "home grown,

    red-blooded, all American"...

     

    Good evening, Gustav,

     

    The excessive adjectives I used to describe a plain text editor was just

    a feeble attempt at humor, an expression referring to any plain text

    editor.  In an international forum such as this newsgroup, I should have

    known that many forms of humor will rarely cross cultural boundaries

    with any degree of success, but of course that didn't stop me from trying.

     

    I suppose I could have replaced "all American" with "all Terran" as I'm

    fairly certain that such editors do not include extraterrestrial

    influence... but then again maybe they do.

     

    For what it's worth, Bram Moolenaar has done an excellent job with vim.

    I have been using it's predecessors, vi and ex, since the late 70's.

    When vim came along in the early 90's, it provided many additional

    features that were welcome tools on my desk.  To this day, vim remains

    my text editor of choice.  I've even go so far as to install the jvi

    add-on to NetBeans providing me with vi-like editor commands.

     

    Enjoy,

        - Chuck

     

Reply
  • in reply to Gustav_M

    On 10/12/2011 01:47 PM, Gustav wrote:

    Good morning Chuck,

     

    Here in Denmark it is late night already.

     

    Maybe I should have posted my suggestion under support, but with all due

    respect the vim editor is written by Bram Moolenaar (born in 1961, in

    Lisse, province of Zuid-Holland, Netherlands). That is not "home grown,

    red-blooded, all American"...

     

    Good evening, Gustav,

     

    The excessive adjectives I used to describe a plain text editor was just

    a feeble attempt at humor, an expression referring to any plain text

    editor.  In an international forum such as this newsgroup, I should have

    known that many forms of humor will rarely cross cultural boundaries

    with any degree of success, but of course that didn't stop me from trying.

     

    I suppose I could have replaced "all American" with "all Terran" as I'm

    fairly certain that such editors do not include extraterrestrial

    influence... but then again maybe they do.

     

    For what it's worth, Bram Moolenaar has done an excellent job with vim.

    I have been using it's predecessors, vi and ex, since the late 70's.

    When vim came along in the early 90's, it provided many additional

    features that were welcome tools on my desk.  To this day, vim remains

    my text editor of choice.  I've even go so far as to install the jvi

    add-on to NetBeans providing me with vi-like editor commands.

     

    Enjoy,

        - Chuck

     

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