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What is the difference between the Board Geometry / Outline and Board Geometry Design Outline, which is most preferable while creating a PCB board.

RohitRohan

Hai community,

I had a doubt, when i am creating a Board Geometry outline, i can seen 2 different subclass in Version 17.4 onwards, which will be more preferable for PCB board creation, is it just the outline or is it better to use the design outline as the subclass, also should i use the cutout also along with the Design outline subclass.

  • 0

    It depends on your standard. I prefer BG> outline. Cutout is not necessary I normally use it when there need to be a big hole/cutout in the board for passing some wires. 

  • 0

    On ealier versions of Allegro, Board-Geometry/Outine was used in constructing the board outline. Later a new subclass Board-Geometry/Design-Outline was added. I would use Design-Outline moving forward, Outline is there for backwards compatibility.

  • 0

    HI Rohit,

    Please use Design outline subclass to define your board shape and use cutout subclass if you have any shapes within design outline.

    Thank you.

  • 0 in reply to VVRD

    Hai VVRD,

    Hope you are doing well.

    One doubt, suppose if my client Company had sent me a PCB layout board file and they have used just outline, should I remove the outline and place the Design Outline + cutout or if I continue to use the outline is there any problem in it?.

    Regards,

    Rohit Rohan

  • 0 in reply to RohitRohan

    Hello  , The board files in the16.6-2015 release contain the board outline and cutout data on the BOARD GEOMETRY/OUTLINE Subclass. When moving the design to the 17.2, onwards release, these geometries get copied to the new DESIGN_OUTLINE and CUTOUT
    subclasses.

    I recommend to use newer Design Outline and Cutout classes/subclasses.

    These new subclasses provide greater capabilities in the PCB Editor to leverage the board outline in various ways. I remember some of them and listing the same below:

    Enhanced DRC capabilities – Object to board outline checks

    Pad to board edge
    Mask to cutout and/or board edge
    Cutout to board edge
    Rigid-flex support – Zone creation
    Trimming of zone edges to DESIGN_OULTINE edge

    ECAD/MCAD collaboration
    Facilitates independent management of board outline and cutouts
    Eliminates the need to determine what is outline and/or cutout from other objects
    Ensures enhanced STEP Export of outline and cutouts

    Manufacturing
    Eliminates the need to determine what is outline and/or cutout from other objects

    The new DESIGN_OUTLINE subclass is a shape that defines the outline of the PCB, flex, or rigid flex. The OUTLINE subclass might still be used to define the outline because there is no requirement for the outline to be a closed polygon, though it has always been preferred.


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