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March 2007

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Subject:
From:
"Tempea, Ioan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tempea, Ioan
Date:
Thu, 1 Mar 2007 07:53:26 -0500
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Mike,

I could give you the "it depends", but I will make it slightly easier:
- the SMT components can have any orientation you want, so you place them the way that suits you better
- the TH parts are better off if they are all oriented the same way (all the ICs same orientation, all the polarized axials and radials same orientation).

Why? It comes from the insertion machines and the fact that we want maximum productivity. The SMT inserters rotate the part, while the TH inserters rotate the PCB. The rotation of the SMT parts is done on the fly, with no speed loss, while indexing the board in the TH inserters is long and if you turn the board once (90 degrees) you have to finish all the 360deg, in order to bring the board in the loading position. The rotation of the TH machine table is made in 90 deg increments and making a full 360 can very oftenly be longer than the insertion time.

Regards,

Ioan

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Green, Mike
Sent: Wednesday, February 28, 2007 8:59 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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