George,
It matters when the component placement angle and origin are transferred from the CAD system to the assembly equipment. If the part is designed out of phase from the actual part in the tape or tube the part will be placed wrong UNLESS the pick and place machine can recognize parts orientation.
Scott
Uptain, George wrote:
> I think you are is missing the point (although [log in to unmask] is the only one that can say) To me he seems to be asking how he should create the library part. The answer to that is, IT DON'T MATTER. It can be rotated any which way in most every CAD system I know of when it's placed on the board. THEN assembly and fabrication rules apply. But not in library part creation.
> How 'bout it [log in to unmask] , you're a librarian, right?
> George Uptain - Schlumberger Oilfield Services
> Austin, Texas
> [log in to unmask] (512)331-3183
>
> -----Original Message-----
> From: Olson, Jack C [mailto:[log in to unmask]]
> Sent: Tuesday, September 22, 1998 11:14 AM
> To: [log in to unmask]
> Subject: Re: [DC] PCB Footprint standard for smt polarised components?
>
> I would like to know which standard that is, that you are referring to. Most
> reels of components that I have seen, the polarity is on the left at zero
> rotation. On a related topic, IC's in sticks have pin 1 to the upper left,
> and IC's on reels have pin 1 lower left, everything I have seen is always on
> the left, or have I lost my mind? (don't have any reels here)
>
> Onward thru the fog, Jack
>
> -----Original Message-----
> From: Barry Olney [SMTP:[log in to unmask]]
> Sent: Monday, September 21, 1998 5:55 PM
> To: [log in to unmask]
> Subject: Re: [DC] PCB Footprint standard for smt polarised
> components?
>
> Hi Paul,
>
> According to the Jedec standard:
> The component should be drawn parallel to the X axis
> The polarisation marking and Pin 1 to the right.
>
> Cheers,
>
> Barry Olney
>
> Paul Arklay wrote:
> >
> > Hi Everyone,
> >
> > When creating smt polarised component geometries on your cad
> system for pcb
> > design do you create them horizontally with the polarised side to
> the right
> > or the left? In other words is there a standard for this when
> creating
> > PCB footprints?
> >
> > Best Regards,
> > Paul Arklay
> >
> > Jtec Pty Limited
> > Unit 3
> > 118-122 Bowden Street
> > Meadowbank NSW 2114
> > Sydney Australia
> >
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> __________________________________________________________________
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> Managing Director
>
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