Maybe just a matter of terms, but you want a foam that will compress some,
but will not _permanently deform_. Some spray foams will compress, but will
not rebound, leaving lots of room for parts to rattle around in.
Bob
-----Original Message-----
From: Sridhar the POWERful [mailto:vance@ikickass.org]
Sent: Wednesday, April 17, 2002 1:29 AM
To: Chad Fernandez
Cc: classiccmp(a)classiccmp.org
Subject: Re: UPS was Re: Need Burroughs Tape Spec's
<snip>
Actually, you want noncompressible foam so that it doesn't get compressed,
making empty space into which your equipment can fall. The main reason
why newspaper is a bad packing material. You want something that will
absorb shock *without* compressing.
^^^^^^^^^^^
Peace... Sridhar
<snip>
UPS... Another data point.
We build RTD and RTD based assemblies, One time two
probes were shipped to a vendor and we get an RMA request...
Seems the probes were BENT. Now to appreciate that you have to
understand these were .25" od probes (in a 316L sheath) and that
inside a 1"od inconel thermowell (1"od .25" id) and they were BENT.
UPS denied any culpability, they also paid.
Allison
From: jpero(a)sympatico.ca <jpero(a)sympatico.ca>
>I wondered whom is right?
>
>cathode oxide or
>heater coating?
The heater looses emissivity.
Also the oxide from ION bombardment and local heating from the electron
beam gets burned.
In some systems the HV PS tends to fade over time as well!
I have a bunch of Acer tubes that did the latter when run at 800x600.
Allison
> > From: Christopher Smith <csmith(a)amdocs.com>
>
> > > From: John Chris Wren [mailto:jcwren@jcwren.com]
> >
> > > But then, one thing I have noticed about the list, besides being an
> > > excellent wealth of information and intelligent people, is that some don't
> > > know when to let something end.
> >
> > You can count me in that category. I wonder whether it's typical
> > of the kind of person you'd find on this list?
> >
> > As a general observation, technical types tend to push things
> > further than most people appreciate in several cases.
>
> That's because we want to be *right.* It took me a long time to learn that
> I'd rather be happy than right.
They're not the same thing????
;)
> From: John Chris Wren <jcwren(a)jcwren.com>
> Jesus. And people wonder why women have a hard time in the industry.
No kidding! My wife Debbie created our computer store/repair shop, but she
ultimately quit because of the disrespect she received from customers. She
has ten years experience with telecommunications gear, and Wintel boxes are
not much of a challenge for her.
Real conversation: Woman enters the store carrying a PC.
Woman: "I need help with my computer. Can he help me?" (Points to me,
busy swapping out a hard drive.)
Debbie: Well, *he's* busy right now. How may I help you?
Woman: I need help with my computer. When will he be available?
Debbie: I don't know, but *I* can help you right now.
Woman: You don't understand, my computer is broken and I need it fixed.
Debbie: I can fix your PC if you will just explain the problem to me.
Woman: Don't give me that crap! Women don't know anything about
computers!
This sort of thing happened almost every day. I don't blame Deb at all for
leaving the industry. Of course, we're in Florida, so you have to expect
some redneck attitudes, but from a *woman*??
Glen
0/0
Jonathan Engdahl mentioned the TI chip in the Simon game, which reminds me I
have some TI TMS34010 chips and one TMS34010 User's Guide that I don' need.
The chips are on B+H scanner (?) 3-board stacks with graphic RAM and SCSI
and printer ports, and are a bit heavy. I can pull the TMS chip if anyone
wants just that. Free for postage. Reply to robert_feldman(at)jdedwards.com.
.. (and, as lab supplies, they don't get confused
by being fed backwards, so I don't need the diodes)...
Lab supplies have the diodes built in on both the + and - legs.
running only one in "voltage source" mode, the other(s) in
"current source" mode effectively.
This is how any group of paralell power supplies works.
So, I think if you use PSUs that have a current limiting circuit
that is
not only for short-circuit protection, but engages smoothly as
current
approaches the continuous rating of the PSU,
You don't need this, in fact it can cause problems with groups
of supplies hunting between Ilimit and Vlimit as load is transfered
between them.
you should be able to connect them in parallel with said
diodes. Of course, these PSUs will not be the cheapest
devices...
As long as you match all the supplies to closer than the vf
drop of the diodes nearly any supplies can be connected
this way.
However, this setup may get difficult if loading varies widely.
Usually it isn't a problem as long as there is no minimum
load requirement for the individual supplies.
Another problem might be shutting down the entire system if
one or more of the supplies fail:
Use enough supplies so that one faliure is tollerable. you can
then hot swap the dud supply.
you wouldn't want the remaining ones to supply as much
current as they can, keeping the voltage only half-way up
and running your circuitry in brown-out mode.
If the outputs are overcurrent protected then a faliure of too many
supplies should shut down the whole thing. Trouble is it often
doesn't work that way.
Lee.
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News about the Apple I auction has appeared on zdnn @
http://zdnet.com.com/2100-1106-884678.html
But they don't give a link to the auction site and they don't even mention
Sellams' name!
But at least it's getting *some* publicity... :)
Cheers,
Bryan
On April 16, John R. Keys Jr. wrote:
> UPS delivered my Burroughs tape unit model BU4180 yesterday but it was
> destroyed. They must have dropped it from a high place as this thing
> weighs in at almost 80 pounds. Things inside are pretty bad but I would
> like to try and get it looking nice again, since the boards inside are
> damaged I do not think I can get it to work again. Does anyone on the
> list have repair manual for this model? I would like to see how he belts
> go around the pulleys inside the case. Thanks
I'm wondering how UPS manages to stay in business anymore. I've
shipped about four things via UPS in the past year, and EVERY ONE OF
THEM arrived damaged to some extent. WTF??
-Dave
--
Dave McGuire "Mmmm. Big."
St. Petersburg, FL -Den
At 12:31 PM 16/04/2002 -0400, r. 'bear' stricklin wrote:
>Here's a data point for you.
And another (Australian one). Years ago when RZ28s were new disk drives and
StorageWorks was a new concept I was Senior Systems Programmer looking
after a VMS cluster (this story is sufficiently old it might even be on
topic :-). In those days RZ28s in SBB were about AUD$3K and we'd ordered
20. My office overlooked the loading bay and I watched in horror as the
delivery driver DROPPED the disks off the back of the truck onto the ground
(say 4 feet).
He couldn't understand why I wasn't going to sign for the delivery - I told
him to take them back. Digital changed their preferred courier shortly
thereafter.....
Huw Davies | e-mail: Huw.Davies(a)kerberos.davies.net.au
| "If God had wanted soccer played in the
| air, the sky would be painted green"
