TECHNET Archives

March 2007

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Thu, 1 Mar 2007 08:56:31 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (68 lines)
Mike,

For years we used your second choice.  We now use the logic of all
polarized components in the same direction, but not limited to only one
direction.  By this I mean we can have some vertical and some
horizontal, but in either choice all polarized components must be
oriented in the same direction.  We do allow for deviations from this
standard if there is no good way to comply and still make the circuit
work.

There are two benefits from making them all go in the same direction.
For inspection purposes it becomes an easy task to identify those
components that are not correct.  For machine inserting, particularly
PTH, the placement head does not have to constantly rotate to different
positions, hence there is some gain in assembly time. 

For high frequency or very low current circuits this may all be a load
of crap.  So I'll use the phrase "It depends..." on what your needs are
to make the circuit work balanced against the poka-yoke simplicity of
all polarized components facing in the same direction.

Hope this helps.

Phil

-----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.


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2