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Question regarding layer preferences

Former Member

Hi,

As a newcomer to Eagle I am trying to create a two layer pcb with mainly

through hole components but with a couple of smd ic's on the top.

When I use the Autorouter it chooses to put the majority of tracks on the

top even for the through hole components.

Is there a way I can get Eagle to give preference to the bottom layer and

use only the top when necessary?

I understand that if I want to put the smd ic's on the bottom layer I can

use the Mirror command. I tried this and it works.

However, I would like to mount a pin header to connect from the bottom of

the board with the pads on the top. The mirror command does not seem to

work for this. I there a way around this? I don't have the facility of

through hole plating.

Regards

Don m5aky

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Parents

  • On 2/27/2015 4:32 AM, Don wrote:

    Hi,

    As a newcomer to Eagle I am trying to create a two layer pcb with mainly

    through hole components but with a couple of smd ic's on the top.

    When I use the Autorouter it chooses to put the majority of tracks on the

    top even for the through hole components.

    Is there a way I can get Eagle to give preference to the bottom layer and

    use only the top when necessary?

    Hi Don,

     

    I hope you're doing well. You can adjust the layer cost factors so that

    EAGLE favors one layer or another.

    I understand that if I want to put the smd ic's on the bottom layer I can

    use the Mirror command. I tried this and it works.

    However, I would like to mount a pin header to connect from the bottom of

    the board with the pads on the top. The mirror command does not seem to

    work for this. I there a way around this?

     

    The mirror command works for through-hole components as well, the issue

    is that through-hole pads don't change colors when you flip them. The

    only way to be able to tell is by look at the reference designators. If

    they are mirrored then the text will look backwards.

     

    Let me know if there's anything else I can do for you.

     

    Best Regards,

    Jorge Garcia

     

     

     

Reply

  • On 2/27/2015 4:32 AM, Don wrote:

    Hi,

    As a newcomer to Eagle I am trying to create a two layer pcb with mainly

    through hole components but with a couple of smd ic's on the top.

    When I use the Autorouter it chooses to put the majority of tracks on the

    top even for the through hole components.

    Is there a way I can get Eagle to give preference to the bottom layer and

    use only the top when necessary?

    Hi Don,

     

    I hope you're doing well. You can adjust the layer cost factors so that

    EAGLE favors one layer or another.

    I understand that if I want to put the smd ic's on the bottom layer I can

    use the Mirror command. I tried this and it works.

    However, I would like to mount a pin header to connect from the bottom of

    the board with the pads on the top. The mirror command does not seem to

    work for this. I there a way around this?

     

    The mirror command works for through-hole components as well, the issue

    is that through-hole pads don't change colors when you flip them. The

    only way to be able to tell is by look at the reference designators. If

    they are mirrored then the text will look backwards.

     

    Let me know if there's anything else I can do for you.

     

    Best Regards,

    Jorge Garcia

     

     

     

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