[PCB_FORUM] Re: paste pad on fiducial

I was told by some of the places we use for assembly prefers it to have pads with paste because it's easier for the pick and place machine to recognize it.  That's what I was told so that's what I have been doing.  Might be different for other assembly houses since some of them didnt' complain about it.  Hope this helps.

From: <george.h.patrick@xxxxxxxxxxxxxx>
Reply-To: icu-pcb-forum@xxxxxxxxxxxxx
To: <icu-pcb-forum@xxxxxxxxxxxxx>
Subject: [PCB_FORUM] Re: paste pad on fiducial
Date: Fri, 18 May 2007 13:44:36 -0700

 
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
ナ 503-627-5272 (voice)     ニ 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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