[PCB_FORUM] Re: Flash symbols

There is no paste layer in package geometry, which means that you need to
define the subclass.
If you define the subclass say package geometry -> pastemask_top what
happens if you have to
Mirror the part? Does the pastemask remain pastemask_top or does it know to
flip it to the bottom?
Do you have to pre-assign a pastemask_bottom to the footprint? I'd also like
to know how the
Flash symbols function for my own knowledge anyway.


Mike


-----Original Message-----
From: Kevin McCowan [mailto:kmccowan@xxxxxxxxxxxxxx] 
Sent: Wednesday, September 29, 2004 9:21 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Flash symbols


Why not just put the shapes you need onto the paste layer in the symbol? We
have some funky rf parts that have a very large base that needs to be
soldered to the board and we just draw in the paste pattern we need and it
gets added to the board as part of the symbol. I could be mistaken but I
think you will have trouble trying to accomplish this with flash shapes. If
you need a special pattern that is difficult to make in allegro you can
always create it in some cad (autocad) tool and import a dxf. It works
great.

Hope this helps,
Kevin McCowan
Sr. PCB Designer
TSI Telsys

gnieski, mike wrote:
>         Looking for some up front info on using flash symbols before I
dive into it.
>         I have never used these before and am interested in seeing flashes
in wysywyg mode.
>         Can flash symbols only be used in padstacks on internal layers? As
thermals?
>         or can they be used on external layers such as top and bottom
pads, soldermask and
>         solder paste. We have a funky solderpaste stensil that requires
multiple separated
>         shapes that cannot be generated with one continuous shape 
> which is needed for an ssm.
> 
>         Also is there any online documentation that explains the best way
to use flash symbols?
>         Like a Flash Symbol Users Guide?
> 
>         thanks,
>         Mike Gnieski
>         EMC2 Corp.
>         Hopkinton, MA
> 
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