Homebrew PCBs

From: "alan00463" <alan00463@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, July 10, 2008 5:48 PM
Subject: [Homebrew_PCBs] CadSoft Eagle pads question


> Looked through the freeware Eagle 4.16's wirepads library.
> Its thirteen thru-hole pads and four SMD pads are more than
> adequate for what I'm doing.
>
> However, in selecting pads for my thru-hole board, I got a couple
> questions:
>
> (1)   The numbers......does anybody know what the numbers
>      in the pads library mean?   For example, the smallest thru-
>      hole pad is marked 1,6/0,8 and the largest thru-hole pad
>      is marked 3,81/1,4

That is similar to how I name my pads, the smaller number is the hole size 
and the larger on is the pad diameter (in mm, of course).

I use Round (1.4, 3.8), for instance, with the hole size first, for round 
pads. Rect (1.0 x 2.0) for rectangular pads (wdith x length), and so on.

Leon
--
Leon Heller
Amateur radio call-sign  G1HSM
Yaesu FT-817ND transceiver
Suzuki SV1000S motorcycle
leon355@...
http://www.geocities.com/leon_heller

From: "alan00463" <alan00463@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, July 10, 2008 11:48 AM
Subject: [Homebrew_PCBs] CadSoft Eagle pads question


> Looked through the freeware Eagle 4.16's wirepads library.
> Its thirteen thru-hole pads and four SMD pads are more than
> adequate for what I'm doing.
>
> However, in selecting pads for my thru-hole board, I got a couple
> questions:
>
> (1)   The numbers......does anybody know what the numbers
>      in the pads library mean?   For example, the smallest thru-
>      hole pad is marked 1,6/0,8 and the largest thru-hole pad
>      is marked 3,81/1,4
>
> (2)   When I add a pad, do I only add it to the board file, or is it
>  necessary to also add a corresponding entity to the schematic?
>
> Regards,
> Alan

>
>Regards,
>Alan

From: "Harvey White" <madyn@...>
To: <Homebrew_PCBs@yahoogroups.com>

>>> For mounting pads, try polygons.
>>>
>>> Harvey
>>
>>Not exactly sure what you meant by that tip, Harvey
>>Do you mean mounting pads for connecting SMT parts?
>
> Yes, or anything else you want to solder to the foil directly.  I also
> use polygons for large ground planes.

If you have special needs, sure, you could do that. For almost everthing 
else, though, just place the part in the schematic, connect it up, and the 
pads for the selected part show up on the board. If you selected, for 
example, a transistor 2N2222 in a TO92 case, the footprint for the TO92 is 
placed on the board. If it was an SOT23 package, the SMD for that would be 
on the board. You'll almost always find it easier to design special pads as 
an SMD's in the library editor than as polygons on the board. Ground and 
power planes, of course, are exceptions.

From: alan00463 <alan00463@...>
Subject: [Homebrew_PCBs] Re: CadSoft Eagle pads question
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, July 11, 2008, 10:40 AM






--- In Homebrew_PCBs@ yahoogroups. com, "Mike Young" <mikewhy@... > wrote:
>
> ----- Original Message ----- 
> From: "Harvey White" <madyn@...>
> To: <Homebrew_PCBs@ yahoogroups. com>
> 
> >>> For mounting pads, try polygons.
> >>>
> >>> Harvey
> >>
> >>Not exactly sure what you meant by that tip, Harvey
> >>Do you mean mounting pads for connecting SMT parts?
> >
> > Yes, or anything else you want to solder to the foil directly. I also
> > use polygons for large ground planes.
> 
> If you have special needs, sure, you could do that. For almost
everthing 
> else, though, just place the part in the schematic, connect it up,
and the 
> pads for the selected part show up on the board. If you selected, for 
> example, a transistor 2N2222 in a TO92 case, the footprint for the
TO92 is 
> placed on the board. If it was an SOT23 package, the SMD for that
would be 
> on the board. You'll almost always find it easier to design special
pads as 
> an SMD's in the library editor than as polygons on the board. Ground
and 
> power planes, of course, are exceptions.

Although I don't need a polygon now, I have used polygon to
create a groundplane in the past. However, when doing so,
I could not figure out how to merge the filled polygon
with the adjacent ground trace. Eagle always left an etched space
between the two.

 














      

[Non-text portions of this message have been removed]

> Although I don't need a polygon now, I have used polygon to
> create a groundplane in the past. However, when doing so,
> I could not figure out how to merge the filled polygon
> with the adjacent ground trace. Eagle always left an etched space
> between the two.
>
>

----- Original Message ----- 
From: "Viper62pr" <viper62pr@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, July 11, 2008 9:28 AM
Subject: Re: [Homebrew_PCBs] Re: CadSoft Eagle pads question


I have used polygons to make ground planes also, I would just rename the 
polygon as GND same as all of my GNDs, I use a polygon around the whole 
bottom layer.
Actually, I have only done it twice but they have turned out nice.

--- On Fri, 7/11/08, alan00463 <alan00463@...> wrote:

From: alan00463 <alan00463@...>
Subject: [Homebrew_PCBs] Re: CadSoft Eagle pads question
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, July 11, 2008, 10:40 AM

Although I don't need a polygon now, I have used polygon to
create a groundplane in the past. However, when doing so,
I could not figure out how to merge the filled polygon
with the adjacent ground trace. Eagle always left an etched space
between the two.

> 
> Although I don't need a polygon now, I have used polygon to
> create a groundplane in the past. However, when doing so,
> I could not figure out how to merge the filled polygon
> with the adjacent ground trace. Eagle always left an etched space
> between the two.
>

>
> Follow the instructions in the Eagle tutorial to understand how to
> pour ground planes. 
> 
> This subject should be discussed in the eaglecad@yahoogroups.com group.
> 
> Regards  
> 
> 
> > 
> > Although I don't need a polygon now, I have used polygon to
> > create a groundplane in the past. However, when doing so,
> > I could not figure out how to merge the filled polygon
> > with the adjacent ground trace. Eagle always left an etched space
> > between the two.
> >
>