EAGLE Central Forums
Where the EAGLE community meets. Sponsored by Stratford Digital.

Home » CadSoft Support Forums » eagle.support.eng » ring-shaped smd pad footprint
ring-shaped smd pad footprint [message #157356] Mon, 08 September 2014 13:30 Go to next message
Oliver Schumann
Messages: 33
Registered: November 2006
Member
I need to create 2 ring-shaped smd pads.
One with smaller diameter on bottom side and one with bigger diameter on
top side.
Using a round polygon with inner cutout-polygon has no use. In lib or
board the cutout-polygon is ignored.

Eagle 6.5.0

--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/125916
Re: ring-shaped smd pad footprint [message #157360 is a reply to message #157356] Tue, 09 September 2014 00:42 Go to previous messageGo to next message
warrenbrayshaw
Messages: 1767
Registered: January 2010
Location: New Zealand
Senior Member
Oliver Schumann wrote on Tue, 09 September 2014 01:30
I need to create 2 ring-shaped smd pads.
One with smaller diameter on bottom side and one with bigger diameter on
top side.
Using a round polygon with inner cutout-polygon has no use. In lib or
board the cutout-polygon is ignored.

Eagle 6.5.0

--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/125916



Look in the HELP
"Arbitrary Pad Shapes
If the standard pad shapes are not sufficient for a particular package, you can create arbitrary pad shapes by drawing a polygon around a pad, or by drawing wires that have one end connected to the pad. "

Depending on the size the wire approach may be better than the polygon. In that case read about Wire in the help to make arcs.

Let us know the sizes of your rings (diameter and width of the copper) and someone will likely create examples for you to learn from

HTH
Warren
Re: ring-shaped smd pad [message #157367 is a reply to message #157360] Tue, 09 September 2014 11:09 Go to previous messageGo to next message
Oliver Schumann
Messages: 33
Registered: November 2006
Member
The polygon variant was not sufficient, because I need a hole in it.
A circle didn't connect to the smd pad.
But the wire made the job.
Thanks for the hint.

Oliver S. ISLE GmbH, Ilmenau.

--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/125992
Re: ring-shaped smd pad [message #157374 is a reply to message #157367] Tue, 09 September 2014 18:33 Go to previous messageGo to next message
Guillaume barrey[1]
Messages: 260
Registered: July 2013
Senior Member
Hi,

You can do it with a polygon, but you have to start with an incomplete
ring, because eagle will consider that you polygon command is ended to
soon (look at the example...
[polygon.png]

Then you edit the polygon by moving the vertical line, in order to have
the complete ring !

--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/126018
Re: ring-shaped smd pad [message #169351 is a reply to message #157374] Sat, 11 February 2017 01:49 Go to previous message
Jason Cortell
Messages: 1
Registered: February 2017
Junior Member
The complicated polygon here seems to be the best answer, though you can't let the two vertical top lines quite overlap or you will get an invalid polygon error.
Using wires, circles, arcs, etc. overlapping a pad seems to be basically a hack and of limited use. The reason seems to be that only polygons can be part of a named net; the others can't.
If you use polygons in your board they will not work right with a ring pad made of a wire. For example, I want my pad (connected to GND) to connect to my GND power plane. Nope, doesn't work. The power plane maintains a nice gap all around my ring and doesn't connect properly. With the polygon version it does, but it's much more annoying to draw than a circle.

Can you EAGLE guys fix the cutout feature so it works for library parts? Thanks. (I'm still on version 7.1, so ignore if it has been fixed already.) Also, why can't wires and stuff be assigned to nets, like you can with vias and polygons?

--
To view any images and attachments in this post, visit:
https://www.element14.com/community/message/215698
Previous Topic: Dual stacked combo dsub connector needed
Next Topic: Repeatedly having to enter my licence key and code for hobbyist licence
Goto Forum:
  


Current Time: Fri Sep 22 22:26:28 GMT 2017