top and bottom layers do not line up

You set whether the bottom layer is mirrored in the cam job,

The default is reversed.

Happy Monday,

Doug

"vadryn P" <vadrynpierre@gmail.com> wrote in message

news:hhbdg5$lcs$1@cheetah.cadsoft.de...

Hi all,

 

I printed out cam files using the cam processor. When I viewed the files

in gerbviewer i noticed that the layers do not line up. I am not sure why

but the board houses refuse to make the boards because the drills end up

going through the wrong place. For example, the bottom layer ends up

reversed and the top layer remains the same. So the drill holes and solder

mask on the bottom layer are not at the right location. Thanks a lot guys

for your help. Thanks in advance.

 

vp

 

Quote:

I printed out cam files using the cam processor. When I viewed the

files

in gerbviewer i noticed that the layers do not line up. I am not

sure why

but the board houses refuse to make the boards because the drills

end up

going through the wrong place. For example, the bottom layer ends

up

reversed and the top layer remains the same. So the drill holes and

solder

mask on the bottom layer are not at the right location. Thanks a

lot guys

for your help. Thanks in advance.

 

You set whether the bottom layer is mirrored in the cam job,

The default is reversed.

It could also be an offset in either layer.  Make sure that offset is set

to zero.

Cheers,

James.

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Doug schrieb:

You set whether the bottom layer is mirrored in the cam job,

The default is reversed.

That's a very bad default. Obviously it has not been fixed, though it's

an issue since several years (and an FAQ meanwhile).

Board houses actually prefer (or even demand) a simple layer stack,

viewed from the top.

Tilmann

You set whether the bottom layer is mirrored in the cam job,

The default is reversed.

...

Board houses actually prefer (or even demand) a simple layer stack,

viewed from the top.

That is a good reason for having default as mirrored for bottom layer

Christen Fihl schrieb:

You set whether the bottom layer is mirrored in the cam job,

The default is reversed.

...

Board houses actually prefer (or even demand) a simple layer stack,

viewed from the top.

 

That is a good reason for having default as mirrored for bottom layer

Hä??

I am explaining why it is better to not mirror anything at all, and you

answer that's a good reason for mirroring the bottom layer... Does that

make any sense?

Tilmann

Ups, maybe I got my mind upside down, myself

Need to rethink when better time

Christen

"Christen Fihl" <look_at_HSPascal.fihl.net@nospam.plz> wrote in message

news:hhcq40$gql$1@cheetah.cadsoft.de...

Ups, maybe I got my mind upside down, myself

Need to rethink when better time

 

Christen

 

 

Kind of gets confusing...!  Think looking through the top to the bottom.

But YES, this board house in particular would love for that default to be

changed.  We do check them coming in but would prefer the bottom (or any

layer) not to be mirrored.

Terri

Terri Miller wrote on Tue, 29 December 2009 15:48

Kind of gets confusing...!  Think looking through the top to the

bottom.

But YES, this board house in particular would love for that default to

be

changed.  We do check them coming in but would prefer the bottom (or

any

layer) not to be mirrored.

The reason this is confusing is because you guys are not giving a reference

for "mirrored".

What board houses want is for all the Gerber files to have the same origin

and the same orientation as if you are looking thru the board from the top

with xray vision to see the stack of layers.  In other words, layer 1 is

written to the Gerber file normally.  The bottom layer is written as it

would appear looking thru the board from the top.  This is the mirror image

of what it would look like if you were holding the board and looking at the

bottom layer.  Whether you call this "mirrored" or not I have no idea.

I just checked a canned CAM processor job I have, and apparently Eagle's

reference is the same as what board houses want, meaning all layers are as

if viewed thru the board with the top layer up.  You don't want any of the

Mirror, Rotate, or Upside down boxes checked.  If any of these are the

default, then that's just wrong.  It's been a long time since I set up

template CAM jobs that I don't remember if the Eagle defaults had these

boxes unchecked, or I unchecked them many years ago once.

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Olin Lathrop schrieb:

I just checked a canned CAM processor job I have, and apparently Eagle's

reference is the same as what board houses want, meaning all layers are as

if viewed thru the board with the top layer up.  You don't want any of the

Mirror, Rotate, or Upside down boxes checked.  If any of these are the

default, then that's just wrong.  It's been a long time since I set up

template CAM jobs that I don't remember if the Eagle defaults had these

boxes unchecked, or I unchecked them many years ago once.

That's exactly the problem. The CAM job that comes with EAGLE has

"mirrored" checked for the bottom layer. Though this has been discussed

here for several years now, and every then and now people ask this same

question, that default has not been corrected yet. People simply take

the CAM job provided with EAGLE and then run into problems.

Tilmann

Tilmann Reh wrote on Wed, 30 December 2009 02:31

The CAM job that comes with EAGLE has "mirrored" checked for the bottom

layer.

That's a really dumb default since it's opposite of what board houses want.

It should be the other way around, although it's not a big deal since it's

easy to change, and you only have to do it once over the lifetime of using

Eagle.

Quote:

People simply take the CAM job provided with EAGLE and then run into

problems.

Well, duh!  Someone who can't be bothered to read the docs or even check

their gerber files with a free viewer deserves to get the bottom layer of

their board flipped.

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