Always put fids in the PnP file...
Referencing the PnP from the corner of the PCB then sets all positioning and rotation data referenced to the routing accuracy of the PCB and PCB fabricator and not to the design artwork specified by the designer...
Also inclusion of the fids in the PnP files allows faster machine setup....
Paul
Paul Edwards
Process/Quality Engineering
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frank Kimmey
Sent: Tuesday, December 28, 2010 11:03 AM
To: [log in to unmask]
Subject: Re: [TN] Quick question on PCB Fiducials
Shawn,
I have never added Fiducials to my Pick and Place data.
My preference is to set 0,0 at a Fiducial and have the PnP written from there.
Currently the tool I use does not make this easy so I add a dimension to my Assembly drawing to show the offset from 0,0 to first Fiducial.
Fiducials are not parts so they don't belong in a PnP file.
Just another opinion,
FNK
Frank N Kimmey CID+
Manager - PCB Design
Powerwave Technologies Inc
Mobile - 916-670-0645
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Upton, Shawn
Sent: Tuesday, December 28, 2010 10:55 AM
To: [log in to unmask]
Subject: Re: [TN] Quick question on PCB Fiducials
Nah, using Altium. I have them set as "Standard (No BOM)" and it
appears they don't come out on Pick and Place when I do that. Did not
realize until I saw it today, by accident; most of my boards have
fiducials "just in case" it goes to pick and place. This particular
board will be, so I'm glad I caught it now--but now I need to check on
that on a bunch of prior designs...
Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Olav Folland
Sent: Tuesday, December 28, 2010 1:49 PM
To: [log in to unmask]
Subject: Re: [TN] Quick question on PCB Fiducials
They should definitely be in the PNP file.
If you're using PADS, I recommend adding them as non-ECO parts and
giving
them a prefix like 'FID' so they can be spotted easily.
-Olav Folland
> Are they supposed to be listed on the pick and place file? I happened
> to be looking at the csv for a project I'm working on, and didn't see
> them listed. I'm thinking they are required, and that I must have
some
> setting off.
>
> Thanks.
>
> Shawn Upton, KB1CKT
> Test Engineer
> Allegro MicroSystems, Inc
> [log in to unmask]
> 603.626.2429/fax: 603.641.5336
>
>
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