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Autodesk EAGLE
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Autodesk EAGLE
EAGLE User Chat (English) polygon not completely fill, black lines...
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Related

polygon not completely fill, black lines...

autodeskguest
autodeskguest over 15 years ago

Hello,

 

I'm not use to post, hope i will do this wright.

 

I experience something strange last Friday and i'm still obsess by it today.

 

I use Eagle 4.16 r2

I have access to a filmstar photoplotter and a PCB fabrication facility.

I design a 1 layer PCB

This is not my fist time using this procedure, this is not my fist

project in Eagle.

 

I design a small PCB as always, but this time I add a polygon. this is

my first time using polygon on this process.

 

The polygon work fine on the Eagle software. I previously route the GND

like a signal. GND is connect to the polygon...thermal look good.

I check the gerber file in pentalogix view mate. It looks good.

 

I transform the file from gerber to bitmap. As always, nothing wrong here.

 

I start the photo plotter software, import the bitmat file, I see the

bitmap result, it ok

 

I start the machine with negative mirror because this is what i need for

my process.

 

When i develop the film i end up with a series of small black lines (~5

mil) in the polygon and the rest of the line look fine. The small line

are "cut" by the GND route i left in the board soft in Eagle. The film

is negative so clear film is the cooper and the black is etch (no cooper).

 

I use the negative film for my PCB. The line is so small that the etch

did not remove all cooper but i had to check to not over etch.

 

 

I have the feeling this is the way eagle in generating the polygon with

serie of black stip side by side but they are not overlaping so using

negative I end up with small black line. When i use viewmate and ask

for "trace and polygon outline only" i can see that polygon is fill with

a series of strips.

 

Did someone else encounter this problem? A manufacturer maybe!?

Is it a "normal" problem in Eagle?

It this resolve in 5.XX?

Do you edit gerber to solve this mater.

 

Thank you

 

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  • autodeskguest
    autodeskguest over 15 years ago

    Maxime Thibault schrieb:

     

    I'm not use to post, hope i will do this wright.

     

    Almost - when posting to more than one group, always set a follow-up-to.

    (Setting Fup2 eagle.support.eng now.)

     

     

    I have the feeling this is the way eagle in generating the polygon with

    serie of black stip side by side

     

    Yes, EAGLE fills polygons by drawing lines (of the specified "width")

    side by side. Most, of not all, CAD programs do it that way.

     

    but they are not overlaping

     

    They /are/ overlapping - did you forget that you checked your files

    after every conversion step you made? If the lines were not overlapping,

    you would have seen them already in the first verification (gerber

    files, or at least in the first bitmap).

     

    so using

    negative I end up with small black line. When i use viewmate and ask

    for "trace and polygon outline only" i can see that polygon is fill with

    a series of strips.

     

    Did someone else encounter this problem? A manufacturer maybe!?

    Is it a "normal" problem in Eagle?

    It this resolve in 5.XX?

    Do you edit gerber to solve this mater.

     

    This clearly appears to me as a problem of your printer. Maybe it

    depends on the bitmap resolution - if the printer driver has to resize

    the image from your bitmap to its internal resolution, there might be

    rendering problems.

     

    I would try to make use of the "inverted PS" device in the CAMP. But if

    you really need to use bitmaps for this, increase their resolution to

    match or exceed that of the printer. Beware of large files, however...

     

    Tilmann

     

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