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Traces tapering from Via/Pad

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Message 1 of 6
TimZT
2802 Views, 5 Replies

Traces tapering from Via/Pad

Hello, can anybody tell me is there an option in Eagle where the trace can be made to taper in from the restring smoothly, like in a teardrop shape.  Currently I bring out a trace the same width as the restring to about the snap length and then change width down to 4 mil, but this is time consuming and does not have quite the same effect.  In Cadence I think this is called 'fillet'.

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Message 2 of 6
rachaelATWH4
in reply to: TimZT


@Anonymous wrote:

Hello, can anybody tell me is there an option in Eagle where the trace can be made to taper in from the restring smoothly, like in a teardrop shape.  Currently I bring out a trace the same width as the restring to about the snap length and then change width down to 4 mil, but this is time consuming and does not have quite the same effect.  In Cadence I think this is called 'fillet'.


Hi Tim,

 

There is a ULP called teardrops.ulp which ships with EAGLE which may do what you want. However, read the description etc first and work on a copy of your design. The reason is it is drawing a whole bunch of stuff into your board which will then make it a pain to modify later. It's better done on a separate copy and processing that to add teardrops, then if you need to modify your design you go back to the original, make the changes, copy it and re-teardrop the new updated copy. It's not ideal, but EAGLE doesn't natively support teardrops at the moment.

 

Best Regards,


Rachael

Message 3 of 6
C.Nicks
in reply to: TimZT

Hi Tim,

As Rachael stated there is a ulp you can use to create tapered (fillet/teardrop) entries into vias and pads.

I would not, however, recommend the teardrop script that ships with Eagle. The included ulp is very outdated, is not undoable, and does not create curved traces. There is an updated version that can teardrop the board and also undo it later down the line. t's still a good idea to back up before hand, but this way you won't have to go all the way back, or worse yet, ripup all of the segments in order to get back to a non teardropped board. (I recently had to clean up a board from a contractor who ran the included script many times. I had to ripup thousands of overlapping traces because of it)

Download the attached zip and add to your ulp path (or place it in a good place and add the directory to the ulp directories setting).

TEARDROP.ulp is used to create the teardrops, and CLEANWIRE.ulp is used to remove them.

Teardrops.PNG

 

I still don't understand why Eagle had not updated and included the new version. It was uploaded all the way back in 2013.

Best Regards,
Cameron


Eagle Library Resources


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Message 4 of 6
jorge_garcia
in reply to: C.Nicks

Hi Cameron,

Thanks for bringing the new version of the ULP to our attention. I'll look into it, to see if we can add it to the default EAGLE installation.

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

Best Regards,


Jorge Garcia
​Product Support Specialist for Fusion 360 and EAGLE

Kudos are much appreciated if the information I have shared is helpful to you and/or others.

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Message 5 of 6
Mahmoud_Ah
in reply to: jorge_garcia

Dear Jorge

 

I am trying to find way to rout tapered RF signal trace between two different wire pads (2.54mm to 1.27) but could not find way, could you please help me solve this issue?

 

Kind regards

Mahmoud

Message 6 of 6
TimZT
in reply to: Mahmoud_Ah

Hello Mahmoud, I would try to use a polygon with 4mil

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