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Electronics => PCB/EDA/CAD => Eagle => Topic started by: Jefferson on November 26, 2016, 05:13:11 pm

Title: problem of fill around VIA, octagons unacceptable
Post by: Jefferson on November 26, 2016, 05:13:11 pm

Hello all !

Who can explain. How to fill the polygon without octahedron. I also require a minimal 0.15mm line forming the polygon as in the picture.
It was discovered when drilling required 0.1mm, 0.2mm, 0.3mm and 0.15mm thin line polygon

Regards,
Jeff

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: Karel on November 27, 2016, 08:43:07 am

I don't have a solution. But why is it a problem?

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: Jefferson on November 27, 2016, 11:20:29 am

I am interested in how to get rid of the octahedron. And why are they are formed only for the small size of the polygon line?
Since this problem is generated when you use components with a small step pins to pins and dense ICs, there is required a small diameter drilling 0.1mm 0.3mm.
When you are a beginner and used DIP parts, big size PCB it's no problem.

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: Karel on November 28, 2016, 07:33:44 am

I'm curious why the cutout in the polygon must not be hexagon shaped with small via's.
It's simply the result of how Eagle fills a polygon.

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: Jefferson on November 28, 2016, 08:30:00 am

Not six (hexa-gon) eight ( octa-gon) corners or sides. Strangely another if the polygon line is up than 0.15mm, the polygon on the circle. Or the hole diameter up 0.5mm, while also filling a polygon in a circle. I was looking for an opportunity but didn't find the settings.

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: Karel on November 28, 2016, 08:43:38 am

Imho there's no solution. It's the way how Eagle fills a polygon.
Have you tried asking in the official Eagle mailing list?
http://eaglecentral.ca/ (http://eaglecentral.ca/)

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: jgarc063 on November 28, 2016, 08:32:27 pm

Hi Jefferson,

I hope you're doing well. Could you send me the sample file for review?

Send it to support@cadsoftusa.com.

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

Best Regards,
Jorge Garcia
Autodesk Support

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: technotronix on January 17, 2017, 02:03:46 pm

I don't find any solution. Keep us updated if you find any correct solution.

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: ebastler on January 26, 2017, 06:50:58 am

I still have not understood why this constitutes a problem for you. Why would it be problematic to drill a small hole (0.1mm) in the center? The drill diameter must be smaller than your pad, hence the hole will not get close to the octagon at all, right?

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: macegr on January 28, 2017, 12:50:16 am

I've noticed this before, essentially Eagle creates the offset borders of polygon fills with lines rather than curved traces. In some circumstances, this is visible. On small vias, the result is impossible to distinguish from an actual circle. I've also seen this effect appear on large, sweeping curves; it seems to be triggered on a raw x or y division limit. Anyway, the reason for this is you could have thousands of tiny vias on a board, and making all the polygon holes smooth would require many, many tiny trace segments.

Title: Re: problem of fill around VIA, octagons unacceptable
Post by: richardlawson1489 on February 01, 2017, 07:18:26 am

You should send this problem to eagle support team. They are the right person to understand your problem.