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Top/bottom component placement [message #162716] Thu, 06 August 2015 08:45 Go to next message
Logyx
Messages: 34
Registered: May 2015
Member
I'd like to make a double-sided PCB with through-hole components and
circuit traces on both sides but am a little confused about the
top/bottom thing:

1) which side am I looking at in Eagle?
My guess is that I look "down" on the top side of the PCB and that the
components face upwards -correct?

2) How do I place components at the bottom side?
I've read that the "mirror" command does this, but shouldn't the
component color change as well, to indicate t's on the other side? Here
they're all white/green regardless of mirroring or not but I see the pin
numbers change. It's a little confusing to know which side the physical
component is located on.
Re: Top/bottom component placement [message #162723 is a reply to message #162716] Thu, 06 August 2015 16:13 Go to previous messageGo to next message
Jorge Garcia
Messages: 1294
Registered: April 2010
Senior Member
> 1) which side am I looking at in Eagle?
> My guess is that I look "down" on the top side of the PCB and that the
> components face upwards -correct?
This is correct, imagine you have XRAY vision and your staring at the
top of the board.
>
> 2) How do I place components at the bottom side?
> I've read that the "mirror" command does this, but shouldn't the
> component color change as well, to indicate t's on the other side? Here
> they're all white/green regardless of mirroring or not but I see the pin
> numbers change. It's a little confusing to know which side the physical
> component is located on.

The color change happens on surface mount parts. Through hole components
stay the same color, the way you can tell is by looking at the text.
Additionally, if you have the pad names displayed you'll see that their
locations change due to being mounted on the bottom.

Hth,
Jorge Garcia
Re: Top/bottom component placement [message #162751 is a reply to message #162723] Sun, 09 August 2015 10:40 Go to previous messageGo to next message
Logyx
Messages: 34
Registered: May 2015
Member
On 06/08/2015 18:13, Jorge Garcia wrote:
>> 1) which side am I looking at in Eagle?
>> My guess is that I look "down" on the top side of the PCB and that the
>> components face upwards -correct?
> This is correct, imagine you have XRAY vision and your staring at the
> top of the board.

Thanks for clearing that up.

> The color change happens on surface mount parts. Through hole components
> stay the same color, the way you can tell is by looking at the text.
> Additionally, if you have the pad names displayed you'll see that their
> locations change due to being mounted on the bottom.

I see. I assume it's a good idea to print out the bottom and top sides
of the PCB on paper to check before actually ordering the PCB from a
board house. Are there any good guides on how to do that?

L.
Re: Top/bottom component placement [message #162763 is a reply to message #162751] Mon, 10 August 2015 15:58 Go to previous messageGo to next message
Jorge Garcia
Messages: 1294
Registered: April 2010
Senior Member
> I see. I assume it's a good idea to print out the bottom and top sides
> of the PCB on paper to check before actually ordering the PCB from a
> board house. Are there any good guides on how to do that?

Hi Logyx,

Yes that would be a good idea. Just do a File > Print, in the simplest
case you won't have to calibrate your printer and it will print to scale.

If you do have to calibrate then that procedure is pretty simple.

1. Print out a rectangular board and make sure you know the size of it.
2. With calipers or other accurate measurement instrument, measure the
bottom edge of the board. Compare that measurement to what you specified
in EAGLE. Obtain the following ratio:

Specified in EAGLE/ What I measured.

3. Repeat with the right or left edge of the rectangle obtain the ratio.

4. Go file > print on the bottom left you'll see a section labeled
calibrate. Enter the ratios in the appropriate spots and try printing
the rectangle to confirm that your corrections worked.

5. If things got worse, then use the reciprocal of the ratios and try again.

hth,
Jorge Garcia
Re: Top/bottom component placement [message #162764 is a reply to message #162763] Mon, 10 August 2015 21:40 Go to previous messageGo to next message
Logyx
Messages: 34
Registered: May 2015
Member
On 10/08/2015 17:58, Jorge Garcia wrote:
>> I see. I assume it's a good idea to print out the bottom and top sides
>> of the PCB on paper to check before actually ordering the PCB from a
>> board house. Are there any good guides on how to do that?
>
> Hi Logyx,
>
> Yes that would be a good idea. Just do a File > Print, in the simplest
> case you won't have to calibrate your printer and it will print to scale.
>
> If you do have to calibrate then that procedure is pretty simple.

Much appreciated useful info. Thanks Jorge!

L.
Re: Top/bottom component placement [message #164496 is a reply to message #162723] Sun, 20 December 2015 14:51 Go to previous message
Thomas Hambck
Messages: 4
Registered: December 2015
Junior Member
> The color change happens on surface mount parts. Through hole
> components
> stay the same color, the way you can tell is by looking at the text.
>
> Additionally, if you have the pad names displayed you'll see that
> their
>
> locations change due to being mounted on the bottom.

The color change happens for through hole components too.
You can change the colors at the display-menu.

For this example look at tplace / bplace.
Set a color for bplace that is not the same color as tplace.

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