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March 2007

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TechNet E-Mail Forum <[log in to unmask]>, "Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Date:
Thu, 1 Mar 2007 09:25:19 -0500
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From:
Joyce Koo <[log in to unmask]>
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ha, that is why you need design rules and "
constraints"
                 jk
ps... I saw the CAD guy turn off the design rule check feature to make it
easy for routing...scary...
abcd

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, March 01, 2007 9:10 AM
To: [log in to unmask]
Subject: Re: [TN] Component Orientation Survey


It is not just the designers fault. Functional integrity drives
placement. Placement impacts routing. Routing dictates layer count.
Layer count increases cost and thickness. Thickness increases aspect
ratio. Higher aspect ratios decreases reliability. Decreased reliability
increases cost. And it starts all over. Since I have final say it's my
fault that we no longer have the luxury of a paint by number placement
strategy.
Dewey

-----Original Message-----
From: Joyce Koo [mailto:[log in to unmask]]
Sent: Thursday, March 01, 2007 6:54 AM
To: TechNet E-Mail Forum; Whittaker, Dewey (EHCOE)
Subject: RE: [TN] Component Orientation Survey

"The
designs of today demand throwing away the constraints of the past."
because the designer in the past have to make the prototype by
themself...
get the today's designer to do the solder touch up rework on their
non-constraints design will fix it once for all...
                       jk

abcd

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, March 01, 2007 8:47 AM
To: [log in to unmask]
Subject: Re: [TN] Component Orientation Survey


We gave the dream of orthogonal placement up a long time ago. The
designs of today demand throwing away the constraints of the past.
Listening to all the whining from our EMS providers has caused me to
reflect on that decision.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Green, Mike
Sent: Wednesday, February 28, 2007 6:59 PM
To: [log in to unmask]
Subject: [TN] Component Orientation Survey

When you design boards, do you:
-lay out similar polar components oriented in the same direction for
ease of manufacture regardless of the shortest routing
or
-lay out each component oriented in the best position for routing
regardless of the orientation of other similar parts?

We have a difference of opinion as to which is more prevalent practice.


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