[PCB_FORUM] Re: paste pad on fiducial

I'll be working through the night tonight, have had a few teenager problems I'm 
dealing with. WIll send you an email later. Talk to you soon,,,,,joe


----- Original Message ----
From: Peter Pietrangelo <peter_pietrangelo@xxxxxxxxxxxxx>
To: icu-pcb-forum@xxxxxxxxxxxxx
Sent: Friday, May 18, 2007 7:18:47 PM
Subject: [PCB_FORUM] Re: paste pad on fiducial


Solderpaste on fiducials is not a good idea. The vision system will have a 
problem finding the fiducial. 
 
Peter P.
Sr. PCB Design Manager
Flextronics
 



From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of 
george.h.patrick@xxxxxxxxxxxxxx
Sent: Friday, May 18, 2007 1:45 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: paste pad on fiducial
 
 
There was a time this was true.  The vision systems on early pick 'n place 
machines saw the matte paste better than the relatively shiny HASL.  Don't 
think that's the case anymore :))
 
 
-- 
George Patrick
Tektronix, Inc.
Central Engineering, EDS Applications Support
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Å 503-627-5272 (voice)     Æ 503-627-5587 (fax)
http://www.tektronix.com    http://www.pcb-designer.com
 
"Off-Grid and Proud of it!"
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Julian Ungureanu 
(jungurea)
Sent: Friday, May 18, 2007 12:17
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: paste pad on fiducial
I'll take a free guess, too:
The pick and place machine uses it for alignment.
 
Julian
 



From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Douglas Stanley
Sent: Friday, May 18, 2007 12:12 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: paste pad on fiducial
Does it give the assembler something to help register the stencil on the board? 
Just guessing...
 
 
 



From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: Friday, May 18, 2007 12:02 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] paste pad on fiducial

I can't remember why paste pads are on fiducials... can anyone help me. 

Thanks, 
Ed


 
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