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 Post subject: Off center holes in oval pads
PostPosted: 25 Dec 2011, 11:19 
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Joined: 30 Dec 2010, 19:21
Posts: 16
I would like to know how to make round holes in oval pads with the holes off center in the pads. Thanks.


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 Post subject: Re: Off center holes in oval pads
PostPosted: 26 Dec 2011, 09:39 
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Technical Support

Joined: 14 Jun 2010, 06:43
Posts: 1501
You should use polygonal instead of oval pads if you want to achieve off center holes in pads. Holes are always in center of pads, therefore your polygonal pad should be non-central.


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 Post subject: Re: Off center holes in oval pads
PostPosted: 27 Dec 2011, 00:31 
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Joined: 30 Dec 2010, 19:21
Posts: 16
Alex wrote:
You should use polygonal instead of oval pads if you want to achieve off center holes in pads. Holes are always in center of pads, therefore your polygonal pad should be non-central.


Thanks for the response, but that doesn't seem to be a very good solution for the problem that I have.

I am trying to make a pattern for a USB Mini-AB jack, Molex PN 56579. You can see the recommended pattern layout in the top right corner of page one of this document. http://www.molex.com/pdm_docs/sd/565790519_sd.pdf

Do you have any other suggestion for oval pads with offset holes as shown in the referenced drawing?

Thanks.


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 Post subject: Re: Off center holes in oval pads
PostPosted: 28 Dec 2011, 03:21 
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Technical Support

Joined: 14 Jun 2010, 06:43
Posts: 1501
You can try the following trick: use oval SMD pads on bottom side and place through circular vias or pads on them.


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 Post subject: Re: Off center holes in oval pads
PostPosted: 28 Dec 2011, 12:56 
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Joined: 21 Dec 2011, 13:47
Posts: 2
Tracecpm,
I have used the poly pads and they work well for off center.
the only clearance that is important is the apex of the round part of the pad to another, so if these peaks are parallel to each other, then the shape becomes insignificant: as long as min clearance is maintained. I like to offset pads to keep as much room between and behind so I can run traces between when need be.
Using the Poly pad set up takes a little time, but you only need to set up one pad, then rotate them separately as needed. It would be nice to have an offset function on pad setup for all pads.


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 Post subject: Re: Off center holes in oval pads
PostPosted: 28 Dec 2011, 13:08 
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Joined: 30 Dec 2010, 19:21
Posts: 16
Chuck Minton wrote:
Tracecpm,
I have used the poly pads and they work well for off center.
the only clearance that is important is the apex of the round part of the pad to another, so if these peaks are parallel to each other, then the shape becomes insignificant: as long as min clearance is maintained. I like to offset pads to keep as much room between and behind so I can run traces between when need be.
Using the Poly pad set up takes a little time, but you only need to set up one pad, then rotate them separately as needed. It would be nice to have an offset function on pad setup for all pads.


It must be that I don't know how to make poly pads correctly. The only way I know is to use the polygon tool to create a crude shape on the signal layer and then convert that shape to a pad. I don't even know how to create a curve or an arc using the polygon tool. Can you point me to the proper method for creating poly pads? Or could you e-mail me a library that contains some poly pads that you have created?

Thanks.

-- 11 Jan 2012, 18:36 --

Is anyone in Technical Support able to tell me how to create polygons that are ovals?


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