measuring min (clearance)   distance

On 9/26/2016 2:53 PM, Hoyt wrote:

Is there a function or way to display & highlight the minimum distance

between two objects(or traces.  Say you have a zig zag shaped polygon next

to a circular pad, or even two zig-zag traces in the vicinity of one

another.  Is there a way to display how close they come to one another?

 

Hello Hoyt,

There's nothing specifically tailored to that. You could achieve it

using the dimension tool or other measurement methods such as setting a

fine enough grid, place a relative origin and then read the coords off

of the top.

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

Best Regards,

Jorge Garcia

Thanks Jorge:

Of course the measure tool could be used, but you'd maybe have to set/try a

lot of endpoints, hoping to find the minimum, since the min could located

"somewhere" along object A, going over to "somewhere" on object B. 

Similar functionality must already lie within Eagle, since it can check for

clearance rule violations between objects.  I'd like to see this made part

of the measuring tool to show what the actual min clearance IS, WHILE

moving things around.  Maybe light up a dot at the point(s) that match to

the min measured distance, to allow for scooting them.

Or is there another way around this, that I'm missing?

--

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

On 26.09.2016 20:53, Hoyt wrote:

Is there a function or way to display & highlight the minimum distance

between two objects(or traces.  Say you have a zig zag shaped polygon next

to a circular pad, or even two zig-zag traces in the vicinity of one

another.  Is there a way to display how close they come to one another?

 

You can write an ulp for this if you really need it. You "just" need to

wrire the functions to find distances from one object type to another,

then loop through all or grouped objects.

Once I made an ulp that could track down too small same-net clearances

(sliver, shown here

http://www.techdesignforums.com/practice/files/2012/10/tdf-oct12-mentor-pcb-fig4-lrg.jpg),

and fill it with a wire. There may be pieces of that code that could be

used. My large detailed filled polygons was making this a very time

consuming process, but it would work nicely on grouped objects.

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

 

Hi Morten,

That's a neat image, I've never heard the term acid traps before.

Looking at the pictures I think I know what you mean, but if you could

clarify a bit(more for my own education than anything) what an acid trap

is that would be helpful.

I figure that the clearance between same-name signals would be used to

detect things like these.

Best Regards,

Jorge Garcia

On 27.09.2016 18:21, Jorge Garcia wrote:

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

 

 

Hi Morten,

 

That's a neat image, I've never heard the term acid traps before.

Looking at the pictures I think I know what you mean, but if you could

clarify a bit(more for my own education than anything) what an acid trap

is that would be helpful.

 

I figure that the clearance between same-name signals would be used to

detect things like these.

 

Best Regards,

Jorge Garcia

Acid traps are formations that don't easily let go of liquids

because of capillary effects (see

https://en.wikipedia.org/wiki/Capillary_action).

In PCB manufacture terms, this liquid is acid used to etch the copper,

or maybe even acid used to clean the exposed pads. If any of this acid

is left during production, maybe even trapped under solder stop paint,

imagine what it can do over time. Of course this has more effect on thin

features. A thick feature probably has enough copper to neutralize the

acid left, but still there might be moisture doing damage in

the long term.

On 27.09.2016 18:21, Jorge Garcia wrote:

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

 

 

Hi Morten,

 

That's a neat image, I've never heard the term acid traps before.

Looking at the pictures I think I know what you mean, but if you could

clarify a bit(more for my own education than anything) what an acid trap

is that would be helpful.

 

I figure that the clearance between same-name signals would be used to

detect things like these.

 

Best Regards,

Jorge Garcia

Acid traps are formations that don't easily let go of liquids

because of capillary effects (see

https://en.wikipedia.org/wiki/Capillary_action).

In PCB manufacture terms, this liquid is acid used to etch the copper,

or maybe even acid used to clean the exposed pads. If any of this acid

is left during production, maybe even trapped under solder stop paint,

imagine what it can do over time. Of course this has more effect on thin

features. A thick feature probably has enough copper to neutralize the

acid left, but still there might be moisture doing damage in

the long term.

Am 28.09.2016 um 08:43 schrieb Morten Leikvoll:

On 27.09.2016 18:21, Jorge Garcia wrote:

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

 

 

Hi Morten,

 

That's a neat image, I've never heard the term acid traps before.

Looking at the pictures I think I know what you mean, but if you could

clarify a bit(more for my own education than anything) what an acid trap

is that would be helpful.

 

I figure that the clearance between same-name signals would be used to

detect things like these.

 

Best Regards,

Jorge Garcia

 

Acid traps are formations that don't easily let go of liquids

because of capillary effects (see

https://en.wikipedia.org/wiki/Capillary_action).

 

In PCB manufacture terms, this liquid is acid used to etch the copper,

or maybe even acid used to clean the exposed pads. If any of this acid

is left during production, maybe even trapped under solder stop paint,

imagine what it can do over time. Of course this has more effect on thin

features. A thick feature probably has enough copper to neutralize the

acid left, but still there might be moisture doing damage in

the long term.

 

 

Thanks Morten I have something learned

--

Mit freundlichen Grüßen / With best regards

Joern Paschedag

Am 28.09.2016 um 08:43 schrieb Morten Leikvoll:

On 27.09.2016 18:21, Jorge Garcia wrote:

Off topic, but slightly related to the above + I'm touching things Eagle

can't do, catching acid traps is another one. Examples shown here

http://i.stack.imgur.com/rjEa5.png

 

 

Hi Morten,

 

That's a neat image, I've never heard the term acid traps before.

Looking at the pictures I think I know what you mean, but if you could

clarify a bit(more for my own education than anything) what an acid trap

is that would be helpful.

 

I figure that the clearance between same-name signals would be used to

detect things like these.

 

Best Regards,

Jorge Garcia

 

Acid traps are formations that don't easily let go of liquids

because of capillary effects (see

https://en.wikipedia.org/wiki/Capillary_action).

 

In PCB manufacture terms, this liquid is acid used to etch the copper,

or maybe even acid used to clean the exposed pads. If any of this acid

is left during production, maybe even trapped under solder stop paint,

imagine what it can do over time. Of course this has more effect on thin

features. A thick feature probably has enough copper to neutralize the

acid left, but still there might be moisture doing damage in

the long term.

 

 

Thanks Morten I have something learned

--

Mit freundlichen Grüßen / With best regards

Joern Paschedag