How to create library part with thermal pad?

Well Mr Pearce,

as much as I thank you for your help, I must admit that I am not as

knowledgeable using Eagle as you might have thought I was. That is why I

didn't understand (and still don't) why there are supposed to be holes in

the tStop layer, what they do, nor how come it is one of the only two

layers that are generated automaticall for a SMD pad. there might be

something (or more than one thing) that I don't understand, that's obvious,

but if I did know, then I obviously wouldn't be posting on this forum, eh?

So, no need to insinuate something by saying that I need less syllables in

order to understand, or telling me to read the help file when I don't even

know specifically what to look for... It is hard to know what to look for

when you think you've looked at everything you could think of, and then

there's the things one doesn't think of...

In any case your explanation did help me out. I shall try this polygon

perimeter-delimitation method with the tRestrict layer.

sincerely,

Redcutlass

--

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

Redcutlass wrote on Wed, 30 March 2011 12:29

That is why I didn't understand (and still don't) why there are

supposed to be holes in the tStop layer, what they do, nor how come it is

one of the only two layers that are generated automaticall for a SMD pad.

It seems now the real problem is not as much your understanding of Eagle,

but that you don't understand how PC boards work and how they are made.  If

you did, it would be intuitive how some of the Eagle layers map to layers

of a PCB.

Briefly, a PCB can the thought of as a sandwich of layers.  For simple

double sided boards from top to bottom these are the top silkscreen, top

soldermask, top copper, the PCB material itself (usually FR4 fiberglass),

bottom copper, and bottom soldermask.  You might also have a bottom

silkscreen for a more complicated board.

Go read up on PCB construction, then how the Eagle layers map to that will

make sense.

--

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

Olin wrote on Thu, 31 March 2011 07:27

It seems now the real problem is not as much your understanding of

Eagle, but that you don't understand how PC boards work and how they are

made.  If you did, it would be intuitive how some of the Eagle layers map

to layers of a PCB.

 

Briefly, a PCB can the thought of as a sandwich of layers.  For simple

double sided boards from top to bottom these are the top silkscreen, top

soldermask, top copper, the PCB material itself (usually FR4 fiberglass),

bottom copper, and bottom soldermask.  You might also have a bottom

silkscreen for a more complicated board.

 

Go read up on PCB construction, then how the Eagle layers map to that

will make sense.

euh, no. I am quite aware of how a PC board is made, be it single

double-sided, or multi-layered. I know what the solder mask does and what

delimitation it is supposed to have around the components. This is not my

first succesfully-manufactured board I've designed...

Funny enough,I asked a co-worker if he would refer to the Stop layer (he

doesn't use Eagle) as having "holes" in it, and he looked at me with

question marks in his eyes..

He then suggested that maybe the person who said that meant "openings"...

Then suddenly it all made sense.

You see, it isn't a question of my lack of knowledge, it is a question

using the correct word to describe the Stop layer. when I read holes I

thought to myself: round small openings. That's a hole. Not, "a perimetric

delimitation around an area", which opening would have suggested.

I was hoping not to have to defend myself in such a manner but it seems as

though people would rather assume that I lack knowledge.

anyway, another reader on another related topic has found a solution. I

shall go try that out now.

anyways, thanks for your replies, I hope I don't come off as too defensive.

--

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

On 3/31/2011 7:55 AM, Owen wrote:

Olin wrote on Thu, 31 March 2011 07:27

>> It seems now the real problem is not as much your understanding of

>> Eagle, but that you don't understand how PC boards work and how they are

>> made.  If you did, it would be intuitive how some of the Eagle layers map

>> to layers of a PCB.

>>

>> Briefly, a PCB can the thought of as a sandwich of layers.  For simple

>> double sided boards from top to bottom these are the top silkscreen, top

>> soldermask, top copper, the PCB material itself (usually FR4 fiberglass),

>> bottom copper, and bottom soldermask.  You might also have a bottom

>> silkscreen for a more complicated board.

>>

>> Go read up on PCB construction, then how the Eagle layers map to that

>> will make sense.

>

euh, no. I am quite aware of how a PC board is made, be it single

double-sided, or multi-layered. I know what the solder mask does and what

delimitation it is supposed to have around the components. This is not my

first succesfully-manufactured board I've designed...

Funny enough,I asked a co-worker if he would refer to the Stop layer (he

doesn't use Eagle) as having "holes" in it, and he looked at me with

question marks in his eyes..

 

He then suggested that maybe the person who said that meant "openings"...

Then suddenly it all made sense.

 

You see, it isn't a question of my lack of knowledge, it is a question

using the correct word to describe the Stop layer. when I read holes I

thought to myself: round small openings. That's a hole. Not, "a perimetric

delimitation around an area", which opening would have suggested.

 

I was hoping not to have to defend myself in such a manner but it seems as

though people would rather assume that I lack knowledge.

 

anyway, another reader on another related topic has found a solution. I

shall go try that out now.

 

anyways, thanks for your replies, I hope I don't come off as too defensive.

The people who write the EAGLE software do not have american english as

a first language, some of the terms in EAGLE's english are not clear.

solder-stop is another name for solder-mask and the stop in tStop refers

to this.

There are a lot of cases where you have to be flexible in your

interpretation of EAGLE's terms.  For backward compatibility with

scripts and ULP's, the historic, perhaps misleading, terms are here to stay.

Gary Gofstein wrote on Thu, 31 March 2011 16:19

There are a lot of cases where you have to be flexible in your

interpretation of EAGLE's terms.  For backward compatibility with

scripts and ULP's, the historic, perhaps misleading, terms are here to

stay.

When I first started learning Eagle the poor choice of command names caused

considerable confusion.  For example, CUT does a COPY, and COPY never seems

to do what you want.  WIRE draws lines except when they represent wires,

then you use NET.

It is pretty universally understood that CUT does a copy and delete.  This

was well established before Eagle was written.  It is totally beyond me

what Klaus and company were thinking when they named the copy command

"cut".

Another annoying "feature" that is due to Eagle's origin is that vertical

text reads up not down.  That is the german convention.  However, I am

using the english language version, and judging from the number of

downloads and the activity in this forum, the english language version is

much more popular.  Is this ever going to get fixed?  It's been reported

as a problem long ago.  At the very least there should be a setting for

default vertical text direction.  Currently this is a outright bug in the

english language version, but Cadsoft doesn't seem to take is seriously

because it looks right in the version they use.

--

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

I did not think about that... the famous language barrier. However the

level of english spoken on the forum, I find, is of higher quality than

other forums I visit.

--

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

ain't that true. I'm not surprised to see that other (non-german) members

find this weird. But once you know it... lol

--

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

ain't that true. I'm not surprised to see that other (non-german) members

find this weird. But once you know it... lol

--

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