You are absolutely correct Dal.
That is how we have been doing it for years, but we were generating the
assy dwgs IN Allegro.
A recent process change dictated that we must now output a DXF of the
top and bottom assy layers to the manufacturing dept. Now to dxf this
out, we needed to create a "new".brd to import the plt file / mirror /
scale etc...Then turn on ALL pen layers to be sure we had captured
everything. Also, save the bottom assy.brd in case you need to re-cut
the dxf for any reason.
If we imported the .plt file into our original .brd database, you would
have to toggle all pen layers until you get the right combination. (YUK)
So, this is what is driving us to either mirror the dxf out, or get the
mechanical guy to do it very efficiently.
Regards, Mark.
Dal Locke wrote:
"Making back side assy drawings is easy"
We make a plot file (create plot) with the assy and board outline layers on along with ref des. Then we load the plot file on an assy sheet layer and right click mirror and scale to fit inside the border.
Works great. Allegro can even do searchable pdf plots now in 15.2.
Dal
-----Original Message----- From: Gene Carman [mailto:gcarman@xxxxxxxxxxxxxxx] Sent: Tuesday, September 28, 2004 1:29 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Mirror dxf file? LOL ProE lessons
The funniest thing to consider is the way mechanical guys view
boards verses the way PWB guys view boards... They look at the
board as having "sides" and we view the boards as a single plane
and flip the components. Gee, no wonder there is so much
confusion in exchanging CAD files. I went through this drill with
every new mechanical guy we ever used at our last company. Sometimes the light never went on.
I tend to agree with others that flipping the DXF is best done in
AutoCAD... and frankly working with gerber files for Assy drawings
is not the best approach... gerbers tend to create lines with
width, where as mechanical drawing tools tend to create sharp easy
to read/plot drawings.
-----Original Message----- From: Mark Salberg [mailto:msalberg@xxxxxxxxxxxx] Sent: Tuesday, September 28, 2004 10:58 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Mirror dxf file?
You hit it right on the head Mitch! Some of us used to do it in AutoCad, but our mechanical guy uses both ProE and Sim Cad. When importing our "mirrored" bottom side (text backwards) dxf file into Sim cad...it would "skew" the ref des over parts. And supposedly there was a problem mirroring in ProE. Hard to believe!
We just had another mech guy prove that you can mirror in ProE! Sorry for any confusion, but somebody here needs a ProE lesson I guess.
Thanks, Mark
Mitch S. Morey wrote:
Agreed. If, in fact, you're OUTPUTTING the DXF file to a mechanical package, leave it alone, and mirror it in the mechanical tool. It's simple to do in ANY mechanical package.
Good day.
I don't know the answer to your question, but mirroring is so easy and effective in autocad, that's where I do it. Another thing I do in autocad is hatch the pins for the assembly drawing, as they come over unfilled. To do this easily I export the pins on their own autocad layer, so that I can grab them all to hatch solid.
Patrick Westfeldt, Jr. North Boulder Circuit Design
-----Original Message----- From: Mark Salberg [mailto:msalberg@xxxxxxxxxxxx] Sent: Tuesday, September 28, 2004 8:52 AM To: Cadence User Group Subject: [PCB_FORUM] Mirror dxf file?
Hello all, Is there a way to mirror a dxf file output? We used to create a plot file, mirror on import to .brd, then dxf out. This creates a DXF on pen layers. We want to mirror all of the bottom side components, board outline, etc...for the bottom side assembly drawing. But also would like to output the DXF with real layers instead of pen layers.
Thanks, Mark
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