[PCB_FORUM] Re: Flash symbols

This has recently come up for discussion on the forum and I
believe no consensus was reached. I suggest that you experiment
with it and see what results you get. Add a paste bottom to the
package geometry and try mirroring it.
It cannot hurt to try.
I have used board_geometry>pastemask_top to do mine and I think it
worked although I am not sure I have ever mirrored one of those parts.
Give it a shot and let us know how it works for you.
We love hearing from people who try stuff!

Kevin


gnieski, mike wrote: 
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


-----------------------------------------------------------
To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe

To view the archives of this list please login at
http://www.freelists.org. Our list name is icu-pcb-forum
or go to http://www.freelists.org/archives/icu-pcb-forum/

Problems or Questions:
        Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx

Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum.

SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
POST:       icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------
-----------------------------------------------------------
To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe

To view the archives of this list please login at
http://www.freelists.org. Our list name is icu-pcb-forum
or go to http://www.freelists.org/archives/icu-pcb-forum/

Problems or Questions:
        Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx

Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum.

SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
POST:       icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------

Other related posts: