Re: Gerbers from EDA
- From: qrk <SpamTrap@xxxxxxxx>
- Date: Wed, 12 Jul 2006 21:07:36 GMT
On Wed, 12 Jul 2006 05:30:21 GMT, Robert Baer
<robertbaer@xxxxxxxxxxxxx> wrote:
Say one lays out a one-sided board with the letter "G" in the lower
left corner.
Then make four gerbers: X asis, Y asis; X mirrored, Y asis; X asis, Y
mirrored; and X mirrored, Y mirrored.
That is to say, you *TELL* the EDA to do those operations, eXplicitly!
Please tell me the following:
1) What does -->your<-- EDA generate - ie: what did it *really* do?
2) What is the *standard* for the fab shops, and exactly why?
I can only do a true mirror (x-axis flip) which is only useful for the
solder-side assembly layer documentation.
When I send stuff to the PCB house, all Gerbers are non-mirrored, i.e.
all layers are viewed as shown on your monitor. Makes it easy for you
to check your Gerber plots on your Gerber viewer. The PCB fabricators
will probably like to see all layers as non-mirrored so they can
generate netlists for their probing fixture and look for errors and
design rule issues. The PCB fabricators will mirror layers as required
by their process. There is no need to second guess what they require.
---
Mark
.
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