[PCB_FORUM] Re: Flash symbols
- From: Jean Bratton <jean.bratton@xxxxxxxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Wed, 29 Sep 2004 07:24:59 -0700
Experience says that if you define a layer called anything_top it will
mirror to anything_bottom if you mirror the part BUT only if you've defined
that layer on your board. If you place the part mirrored to start with,
though, it'll create the subclass for you. Just remember to turn on that
subclass in your film control records, though, or you've wasted your time!
Jean
-----Original Message-----
From: Kevin McCowan [mailto:kmccowan@xxxxxxxxxxxxxx]
Sent: Wednesday, September 29, 2004 10:26 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [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
>>
>
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