[PCB_FORUM] Re: How to connect Two thru-hole pads that are placed same location.

Mark:

Here is what we do:
1. one padstack is thru hole pin, lets say for the top connector
2. one padstack is smt, for the bottom connector
3. 
3. you will need to go into constraint manager and change the Allow-> Pad-Pad 
Connect
to ALL_ALLOWED

--- On Wed, 8/27/08, Dave Seymour <dseymour@xxxxxxxxxxx> wrote:
From: Dave Seymour <dseymour@xxxxxxxxxxx>
Subject: [PCB_FORUM] Re: How to connect Two thru-hole pads that are placed same 
location.
To: icu-pcb-forum@xxxxxxxxxxxxx
Date: Wednesday, August 27, 2008, 8:02 AM




 
 

 







That’s fine. 

   

So, you need a work around in Allegro to
get rid of the ratsnest lines. 

   

Make sure you leave “stretch etch”
box checked when you move the connector back into position. 

   

Which was the original idea below: 

   

Mark, 

   

I never have done this, but it seems like
it might work. 

   

Move one of the connectors off board and
make the connections, then move the connector back into position. 

   

If I had to guess, Allegro will keep the
connection. 

   

Just an idea, Hope this helps. 

   

   



Dave Seymour 

Ixia 

919.267.4840 











From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On
Behalf Of Mark Salberg

Sent: Wednesday, August 27, 2008
10:58 AM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: How to
connect Two thru-hole pads that are placed same location. 



   

Our schematic feeds the BOM. Must have both in the
schematic for different populations.





Dave Seymour wrote:  

 Well, one could make a special padstack and
remove the drill, just like an SMT pad and waive the DRCs. 

   

IMHO - The best way to would to let the
BOM control which connector is populated and only have one connector on the
schematic. 

   

In some backplane applications, the pins
are really short and the primary side connector and the secondary side
connector share the same hole. 

On this type of backplane we have the BOM
control the connector and the schematic shows only one connector, even though
both connectors (top, bottom) are populated. 

   

D 

   

   

   



Dave Seymour 

Ixia 

919.267.4840 











From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]
On Behalf Of Gerry Meier

Sent: Wednesday, August 27, 2008
10:34 AM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: How to
connect Two thru-hole pads that are placed same location. 



 

   

What is that doing to do to your
”Drill file” Double drills?? 

   



Gerry Meier, Sr. PCB Designer 

Freedom CAD Services. Inc 

Voice: (256)776-7470 or (603) 864-1350 

Email:gerry.meier@xxxxxxxxxxxxxx 

visit us at http://www.freedomcad.com 

  

  











From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]
On Behalf Of Dave Seymour

Sent: Wednesday, August 27, 2008
9:32 AM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: How to
connect Two thru-hole pads that are placed same location. 



 

   

Mark, 

   

I never have done this, but it seems like
it might work. 

   

Move one of the connectors off board and
make the connections, then move the connector back into position. 

   

If I had to guess, Allegro will keep the
connection. 

   

Just an idea, Hope this helps. 

   

   



Dave Seymour 

Ixia 

919.267.4840 











From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]
On Behalf Of Mark Salberg

Sent: Wednesday, August 27, 2008
10:11 AM

To: icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] How to
connect Two thru-hole pads that are placed same location. 



 

   

We have two thru-hole connectors placed on top of one
another. One populated, one not.

PROBLEM: We can not get rid of rats, because two pins / pads at same X:Y.



Any ideas how to get connection to both pads?



We decided to remove net names from one of the connectors in the schematic, to
allow us to connect to one pad on board. Then waive DRC's.

We are using V.15.7 and Concept front end.



Regards,

Mark 



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