ring-shaped smd pad

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

 

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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

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Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

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

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

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.

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...

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

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?