Jack,
Yes I'm new.
I am not attacking this person. I am simply pointing out that when people
are looking for help that they don't need generalisations which could be
misleading. I thought the idea of this forum was to present up to date
relevant guidelines.
Ok maybe to you I came across as being a bit harsh but I simply was asking
for some clarification on Barry's comments.
Best Regards
Paul Arklay
-----Original Message-----
From: Olson, Jack C <[log in to unmask]>
To: DesignerCouncil E-Mail Forum. <[log in to unmask]>; Paul Arklay
<[log in to unmask]>
Date: 24 September 1998 10:54
Subject: RE: [DC] Jedec standard EIA-JED-95 not relevant for smt polarised
components?
>Chill out....
>
>There IS a standard that explains how components are loaded onto reels,
>EIA-214 or something, I'll check when I get home.
>
>(but I don't know why you attack ONE PERSON in a DISCUSSION for not
>providing the exact answer that YOU PERSONALLY want to get. Are you new?)
>
>
> -----Original Message-----
> From: Paul Arklay [SMTP:[log in to unmask]]
> Sent: Wednesday, September 23, 1998 5:26 PM
> To: [log in to unmask]
> Subject: [DC] Jedec standard EIA-JED-95 not relevant for smt
>polarised components?
>
> Hi Everyone,
>
> Barry Olney wrote:
>
> >We changed our component orientation, years ago, to pin 1 - top
>right in
> >order to comply with our European technology partners.
>
> Who is "we" ?
>
> Was this ever published as a standard by a governing body?
>
> Which European technology partners?
>
> It great to generalise about something that supposedly occurred
>years ago
> but how about some facts.
>
> >There are many Jedec standards at URL http://www.jedec.org I
>thought
> >the issue in question was covered in the EIA-JED-95 standard?
>
> I have looked at this standard on Barry's recommendation and cannot
>see that
> it covers this issue at all. It is a mechanical standard for
>component
> outlines and does not include all polarised components anyway.
>
> It's great to quote standards but one should see if they are
>relevant to
> this issue first.
>
> As far as I can see there is not an official standard for this issue
>and the
> industry has therefore created its own default standard with pin1 to
>the
> bottom left as seen in the majority of responses to my original
>question
> which was sent also to the Mentor Uers Group and Cooper and Chyan
>Technology
> user group.
>
> Best Regards,
> Paul Arklay
>
> Paul Arklay
> PCB Design Engineer
> JTEC Pty Limited
> Unit 3 118-122 Bowden Street
> Meadowbank NSW 2114
> Australia
> Direct +61 2 93900622
> Fax +61 2 93640055
> Switch +61 2 98096933
> Email: [log in to unmask]
>
>
> Barry Olney wrote:
>
> >You are right Jack in that we need to create our libraries and use
> >design rules to suit the end process.
> >
> >We changed our component orientation, years ago, to pin 1 - top
>right in
> >order to comply with our European technology partners.
> >
> >There are many Jedec standards at URL http://www.jedec.org I
>thought
> >the issue in question was covered in the EIA-JED-95 standard?
> >
> >Cheers,
> >
> >Barry Olney
> >
> >Olson, Jack C wrote:
> >>
> >> Well, SOMEONE is missing the point.... <grin>
> >>
> >> Yes, you can create stuff any way you like, but since he has a
>CHOICE
> what
> >> orientation to build them, and since it doesn't matter to the CAD
> operator
> >> what orientation they are, it seems logical and intelligent to
>wonder if
> the
> >> ASSEMBLER might have a preference, eh?
> >>
> >> If you build a library component and plop it into your design,
>and don't
> >> rotate it, at the end of the design cycle when you create your
>pick and
> >> place files for the assembler, that component will be listed as
>zero
> degrees
> >> rotation, right? If you build a SMT resistor vertically, no
>matter how
> you
> >> rotate it in the database, the rotation in the data file will be
>useless
> >> because SMT resistors are packaged horizontally on a reel. The
>operators
> >> know this, so they check rotations before they start, but
>wouldn't it be
> >> nice if we could get MOST OF THEM right in the library? Sometimes
>you
> can't
> >> because some ICs come on reels horizontally, and some come
>packaged in
> >> sticks and come out vertically, so you have to modify some
>rotations no
> >> matter what. But all I am saying is that if you know what your
>vendor is
> >> using, why not make it easy for him and TRY to supply good data?
> >>
> >> Still, you can never win... here at Intel we are asked NOT to
>place
> >> components in the same orientation as they come on the reel,
>because the
> >> type of pick-and-place machine we use rotates the head 180
>degrees as it
> is
> >> moving from the reel to the board, and then will have to rotate
>another
> 180
> >> to get back to the same orientation, which wastes a whole tenth
>of a
> second
> >> (perish the thought!). So, you can never learn enough in this
>business,
> >> right?
> >>
> >> Onward thru the fog, Jack
> >>
>
> ################################################################
> DesignerCouncil E-Mail Forum provided as a free service by IPC using
>LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
>following text in the body:
> To subscribe: SUBSCRIBE DesignerCouncil <your full name>
> To unsubscribe: SIGNOFF DesignerCouncil
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
>section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
>847-509-9700 ext.312
> ################################################################
>
################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe: SIGNOFF DesignerCouncil
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
