At 08:58 AM 9/23/2009, Inge wrote:
>Maybe Bob Dylan? But when he created 'knock, knock...' the inspiration was
>certainly not from a warship, nor anything else military. Looking back, I
>can't understand how we could sleep so good in the hammocks. Once placed in
>it, lying on your back, you couldn't move and turn around as in a normal
>bed.
That was my Father's Navy. 5 deep in hammocks --
so tight you had to get out just to change your mind.
/rimshot
We in the "New Navy" were soft stacked 3 deep in coffin locker bunks.
>I just remember I've never had so good sleep in/on anything else.
>Except for the practical joke when someone hooked off the foot end and let
>it go. Wham! Can't think of a more brutal wakeup.
>
>Inge
>
>
>----- Original Message -----
>From: "Randall L Bock" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, September 23, 2009 5:33 PM
>Subject: Re: [TN] Knock, knock, knock on the heaven's door
>
>
>In the Navy in a Fighter Squadron attached to an Aircraft Carrier, we were
>berthed just under the arresting gear wires aft and one compartment over
>from the breaks. Had to sleep with a radio on after I got out outer wise I
>could not go to sleep. Music to the ears don't ya know.....
>
>
>Randy Bock Sr.
>Quality Engineer / Product Quality Manager
>Enterprise Quality Assurance
>(Email) [log in to unmask]
>Newtown Building 2
>203 270-4931 (NT2)
>8-426-4931
>(Fax)203-270-4982
>Shelton 27 WV 203-922-4014
>(Cell) 203 300-3547
>
>
>
>Pitney Bowes "Engineering the Flow of Communication"
>
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>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix
>Sent: Wednesday, September 23, 2009 11:28 AM
>To: [log in to unmask]
>Subject: Re: [TN] Knock, knock, knock on the heaven's door
>
>slept like a baby right at the waterline just
>above #2 screw on Connie (CV-64) many, many
>nights. Does that explain that bad filling in my tooth? :-)
>
>At 05:50 AM 9/23/2009, Hernefjord Ingemar wrote:
> >Jerry,
> >
> >slowly, a picture begins to form in my mind.
> >When I was in the NAVY, I slept as a baby even
> >at full spead (Destroyer), because the engine
> >was twin steam turbines. Only vibration was a
> >little from the propeller shaft. The
> >last years, I have taken my family across the
> >sea on a big RO-RO. THAT was a difference!
> >Everything was vibrating. Coffee cups rotated on
> >the plates, every chair had its own life, moved
> >slowly like a snail, not to talk about the bed,
> >that was hanging on the wall. I went through
> >minimum and maximum nodes all the night,
> >depending on difference in the rotation speed of
> >the two main engines. You are
> >right. Transportation on the sea means passing
> >a vibration test. I am adding yours and
> >Guenter's posting to the staff. In a few days, a
> >group of technicians are being sent to fix the
> >problems. I will do my best to get them understand.
> >
> >Thanks
> >
> >Inge
> >
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Jerry Dengler
> >Sent: onsdag 23 september 2009 13:47
> >To: [log in to unmask]
> >Subject: Re: [TN] Knock, knock, knock on the heaven's door
> >
> >Hi Inge,
> >
> >We produced a product in the US for the US
> >market that used a socket for a PLCC. This
> >product's usage went up and the customer sent
> >the production to China. At first all was
> >well. After the production got to normal
> >levels, suddenly they were getting a high level
> >of out of box failures. These were all sent via
> >ship. The earlier units were being air
> >freighted in while the factory in China got up
> >to speed. We found fretting at the socket to
> >lead interface. We believe it is vibration from the ship that causes it.
> >
> >Recently the factory in China made 1000
> >units. 500 were air freighted and 500 were sent
> >via ship. We left the 500 units sent by air on
> >the skid until the ocean units arrived. We then
> >tested all 1000 units. 122 of the ocean units
> >failed. None of the air units failed.
> >
> >Jerry
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> >Sent: Wednesday, September 23, 2009 5:59 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Knock, knock, knock on the heaven's door
> >
> >Hi Guenter,
> >interesting. Very interesting. You got fretting
> >issues at 28 Hz? Caused by floor vibration?
> >Really? I've been involved in several fretting
> >problems (aircrafts), but then we had much
> >higher frequencies, maybe multiples of lower
> >resonances. Our equipments were transported by
> >ship to the other side of the planet, and it was
> >then the problems started. I'll check how they
> >were transported, time at sea etc.
> >
> >Thanks again
> >
> >/inge
> >
> >PS. What level of vibration?
> >
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Grossmann, Guenter
> >Sent: onsdag 23 september 2009 09:41
> >To: [log in to unmask]
> >Subject: [TN] AW: [TN] Knock, knock, knock on the heaven's door
> >
> >Hi Inge
> >
> >Vibrations around? I just had recently a similar
> >problem in an industrial environment. Failure
> >analysis showed fretting on socket spring-
> >contacts. When I made vibration measurements I
> >found quite a spectrum of low level vibrations
> >on the floor but a clear resonance at 28Hz in the rack.
> >
> >Best regards
> >
> >Guenter
> >
> >
> >
> > >-----Ursprüngliche Nachricht-----
> > >Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Inge
> > >Gesendet: Dienstag, 22. September 2009 21:34
> > >An: [log in to unmask]
> > >Betreff: [TN] Knock, knock, knock on the heaven's door
> > >
> > >Well, not exactly that, but knock, knock, knock on a earthly board. One
> > >customer needs fix a intermittent problem asap. 19 inch racks with
> > >hundreds of PTH double sided boards, old technology, no BGAs, no QFMs
> > >etc, but lots, lots of DIPs. The edge contact fingers have a very thick
> > >and good gold over nickel, and the backplane connectors have really
> > >stiff double tongues.
> > >The
> > >contact pressure/sq is extremly high and I think the contact spots are
> > >really gastight once the board is plugged in. Now, they have electrical
> > >issues, and they've found, that the signals are interrupted or coming
> > >back when they knock on the boards. Someone is going to take a flight
> > >the other day to fix the problem. The electricians believe, stubborn as
> > >mules, that the only think needed, is to take out the boards and clean
> > >the edge contact fingers with a solvent and that will fix it. Myself,
> > >with quite many year's experience from connectors, I don't think that
> > >is the problem, because when such robust contact springs wipe along the
> > >contact fingers, they slide pretty deep into the gold and makes good
> > >connection. Each spring has double contact ridges, so the risk that
> > >some dirt should cause interrupts is minimal. There is more that talks
> > >against their theory, namely, that the problem is still there after
> > >plugging, deplugging more than once. I'm sure there is a solder joint
> > >issue, or maybe a bond wire problem in the packages.
> > >Logically, this later is more likely because you have thousands of
> > >solder/bond joints vs, just some one hundred edge connector ditto. A
> > >ratio like 10,000/100 per board. Without knowing all details, what is
> > >your general experience between the index finger and the big toe?
> > >
> > >/Inge
> > >
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