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How to fix clearance errors due to polygons

autodeskguest

I uploaded my design to the board house (AC Circuits) using their

manufacturing analysis.  It returned with more than 100 clearance

problems, all caused by the ground polygon being 4.776 mils away from a

signal track.  I have all of the clearances set to 5.00 mils minimum.

How can I fix this?

--

John Bachman, W1JGB

AnaTek Corporation

 

Parents

  • On 3/22/2010 9:54 AM, John Bachman wrote:

    On 3/22/2010 12:26 PM, John Bachman wrote:

    I uploaded my design to the board house (AC Circuits) using their

    manufacturing analysis. It returned with more than 100 clearance

    problems, all caused by the ground polygon being 4.776 mils away from a

    signal track. I have all of the clearances set to 5.00 mils minimum. How

    can I fix this?

    After posting I came up with a fix that seems to work. I changed the

    minimum clearance to 6 mils and ran RATSNEST again to recalc the

    polygons. The board house accepted that design without any clearance

    errors.

     

    yeah, this has happened before. 5mils seems rather tight to me anyways,

    even if they advertise they can hold that tolerance, do you really want

    ( need) them that close? 6 sounds better, and if no reason to have them

    close, i would just use 8. anyone can do 8 these days...

     

Reply

  • On 3/22/2010 9:54 AM, John Bachman wrote:

    On 3/22/2010 12:26 PM, John Bachman wrote:

    I uploaded my design to the board house (AC Circuits) using their

    manufacturing analysis. It returned with more than 100 clearance

    problems, all caused by the ground polygon being 4.776 mils away from a

    signal track. I have all of the clearances set to 5.00 mils minimum. How

    can I fix this?

    After posting I came up with a fix that seems to work. I changed the

    minimum clearance to 6 mils and ran RATSNEST again to recalc the

    polygons. The board house accepted that design without any clearance

    errors.

     

    yeah, this has happened before. 5mils seems rather tight to me anyways,

    even if they advertise they can hold that tolerance, do you really want

    ( need) them that close? 6 sounds better, and if no reason to have them

    close, i would just use 8. anyone can do 8 these days...

     

Children
  • in reply to autodeskguest

    Gary Gofstein wrote on Mon, 22 March 2010 17:05

    and if no reason to have them close, i would just use 8. anyone can do

    8 these days...

     

    Yeah, that's what I do too.  I use 8/8 rules unless there is a good reason

    tighter spacing is needed.  Even if a board house can do better, you don't

    want to be pushing the limits.  8/8 is pretty universally safe nowadays.

     

    --

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