Actions
Forum Thread Details
  • Replies 3 replies
  • Subscribers 179 subscribers
  • Views 516 views
  • Users 0 members are here
Related

Paste/cream adjustment to specific parts?

autodeskguest

  Hi, I need to adjust the solder paste apertures under certain parts that

have large "belly pads" without necessarily adjusting the smaller pads.  I

know a size reduction of paste vs. pad can be done in the DRC->masks->cream

for the entire surface, but I want to know how to modify the paste apertures

on a part-by-part basis.  I am getting reflow errors due to "too much paste"

on some pads.  The datasheets for some of these parts recommend changes to

the paste apertures to improve reflow, so, how do I achieve this?  Thanks.

 

 

  • Scott Rider schrieb:

    Hi, I need to adjust the solder paste apertures under certain parts

    that have large "belly pads" without necessarily adjusting the smaller

    pads.  I know a size reduction of paste vs. pad can be done in the

    DRC->masks->cream for the entire surface, but I want to know how to

    modify the paste apertures on a part-by-part basis.  I am getting reflow

    errors due to "too much paste" on some pads.  The datasheets for some of

    these parts recommend changes to the paste apertures to improve reflow,

    so, how do I achieve this?  Thanks.

     

     

     

    In this case you have to switch off the automatic solder stop or

    cream frame generation. This can be done in the library.

    Do a

      CHANGE CREAM OFF     (CHANGE STOP OFF for solder stop mask)

     

    on all the SMDs in question and draw the cream frame with RECT

    or WIRE or CIRCLE in the tCream layer.

     

    Now use UPDATE in your board to get the parts updated with the

    new package definition.

     

    HTH

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

      CadSoft Support -- hotline@cadsoft.de

      FAQ: http://www.cadsoft.de/faq.htm

     

  • in reply to Richard_H

      Hi Richard,  still having trouble here.  I open the package in the library

    and do the "change cream off"

    command but the cream layer is still creating areas based on the pad layer.

    I can place my own shapes

    in the cream layer but I cannot make the shapes created when copper areas

    are made go away.  Any ideas?

     

    Scott Rider

    /**/

     

    "Richard Hammerl" <ric@cadsoft.de> wrote in message

    news:fscsbp$ogg$3@cheetah.cadsoft.de...

    Scott Rider schrieb:

    Hi, I need to adjust the solder paste apertures under certain parts >

     

    In this case you have to switch off the automatic solder stop or

    cream frame generation. This can be done in the library.

    Do a CHANGE CREAM OFF     (CHANGE STOP OFF for solder stop mask)

     

    on all the SMDs in question and draw the cream frame with RECT

    or WIRE or CIRCLE in the tCream layer.

     

    Now use UPDATE in your board to get the parts updated with the

    new package definition.

     

    HTH

     

     

     

  • in reply to autodeskguest

    Scott Rider schrieb:

    Hi Richard,  still having trouble here.  I open the package in the

    library and do the "change cream off"

    command but the cream layer is still creating areas based on the pad

    layer. I can place my own shapes

    in the cream layer but I cannot make the shapes created when copper

    areas are made go away.  Any ideas?

     

    Scott Rider

    /**/

     

     

    Please send me library and board file. So I can check it here.

     

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

      CadSoft Support -- hotline@cadsoft.de

      FAQ: http://www.cadsoft.de/faq.htm