Wolfgang,
Had similar trouble with some fewer-pin-count connectors that some felt did
not meet our quality requirements. The IPC spec was not good enough for
what we wanted to see. Solution was to have our assembly vendor create and
use an assembly tool to align the connectors properly.
In your case, an additional spec on the drawing, say a perpendicularity
spec referenced to the board edge, or parallelism spec to the edges of a
board inserting into a slot/card cage, would probably resolve the issue.
This would give a measurable parameter for your CM to build to, and for you
to inspect to. Your CM would know exactly what you want them to do. Don't
know what you require, but a tolerance range of 0.010 [0,254] (read +/-
0.005 [0,127]) might work well.
If the connector body extends below surface of the board, would it be
possible to extend the board edge to aid connector alignment?
Roger M. Stoops, C.I.D., PCB Designer
Trimble
Engineering and Construction Division
5475 Kellenburger Rd.
Dayton, OH 45424-1099 USA
Ph: +01 937.233.8921 or +01 937.233.4574 ext 288
Fax: +01 937.233.7511
"Busko, Wolfgang"
<Wolfgang.Busko@BB To: [log in to unmask]
COM-HH.DE> cc:
Sent by: TechNet Subject: [TN] Connector tilt, acceptable or not?
<[log in to unmask]>
08/14/01 11:48 AM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to "Busko,
Wolfgang"
Thanks Steve for your picture service !!!
To all,
I have some pictures on Steveīs page
http://stevezeva.homestead.com/index.html
<http://stevezeva.homestead.com/index.html>
The issue is that these connectors (Teradyne 2mm pitch) adapt our boards to
a backplane and the problem is that due to this obvious shift/tilt the
danger of damaging some of the male connector pins at the backplane if not
mounting these boards with the greatest possible caution is quite probable.
The CM in this case states that according to IPC A610 chapter 5.2.9 this is
within tolerance of 0.5mm as shown and refuses any rework or refund.
The question is, does 5.2.9 apply in this case? The "not acceptable"
criteria is what the discussion is all about. With, letīs say, caution and
some extra force the insertion is possible but I see the danger of breaking
backplane connector pins especially when customer service teams try to
change boards --( it happens from time to time and asks for a new
backplane
or, if in the field, the change of the complete 19" rack)
To do the mounting of the connector properly is absolutely no problem and
has never been one until now that they changed their workflow and team for
this task.
The rework would be: Loosen the srew - attach mating connector module -
resolder over rework wave and the connector adjust automatically
We ourselves do have the "accept or not accept"-debate "now and here" and I
would like to hear what others have to say about the risks of rework
compared to the risk of damaging a more costly device.
Me no like this borderline cases,
Wolfgang
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