Re: Happy Fun Band...

John Robertson wrote:
>
> Certainly they don't blow the glass with the rim in place, it is added
> BEFORE it is evacuated. The steel band is there because a rectangular tube
> is NOT the strongest shape in the world when under stress. The original
> picture tubes were round, until they figured out the principle of wrapping
> a band around the tube to hold it together. This band is the same as the
> trunions added to cast iron cannons in the 1400's to make them much
> stronger.There is quite a bit of history to this band, and as it has been
> said before "He who forgets the past is condemned to repeat it"

Cudo's John! However, you've got my palms sweating a bit. Only last
week I was using a set of vice grips to straighten out the four metal
tabs at each corner of an Amplifone tube. As you know, these tabs are
mounted *under* the metal band. I will be *very* careful next time I
try that again (if at all...)

Thanks,

Noel

>
> I was looking around the web and found this reference to a different
> application that showed how a reinforcing band made a considerable
> difference...
> http://water-rockets.com/safety/
>
> John :-#)#
> (unfortunately this is not very vector-related, other than safety in
> handling the tubes, which I guess is important to iron out.)
>
> At 11:24 PM 12/9/1999 -0500, you wrote:
> >I don't want to ressurect a bad topic, but I don't buy the thing about the
> >band around the tube being critical anyway. Do you suppose they blow the
> >tube with the band in place? NO. I think if you try to take it off, you'll
> >probably accidentally cause stress somewhere and OOPS! That's all. Doesn't
> >matter either way. It's like arguing over predestination... it doesn't
> >change the fact that you do what you should do and don't do what you
> >shouldn't. :-) my 1/2 cents.
> >James
> >
> >
> >----- Original Message -----
>
From: David Shuman <dshuman@mindspring.com>
> >To: <vectorlist@lists.cc.utexas.edu>
> >Sent: Thursday, December 09, 1999 6:12 PM
> >Subject: Re: Happy Fun Band...
> >
> >
> > > Doug Jefferys wrote:
> > > > ...I actually got a little curious as to the metal rim band of a CRT and
> > > > did some poking around on USENET. As a matter of fact, a few people
> > > > *have* removed it while the tube was under vacuum and lived to tell
> > > > about it, but only barely:
> > > > In a nutshell, taunting happy fun band results in an almost immediate
> > > > implosion.
> > >
> > > I had an incident a few years ago in which a Space Fury (sold to me by
> > > Duncan Brown; note this is clearly on-topic for vectorlist) tipped over...
> > > the plywood frame around the monitor got crunched, and the CRT slipped out
> > > of its band. (The bolts holding the CRT to the frame were attached to the
> > > band.)
> > >
> > > The CRT didn't implode--sounds like I got lucky! I never was able to get
> > > that band back on, though.
> > >
> > > --
> > > Dave
> > >
> > >
>
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
> http://www.flippers.com
> "Old pinballers never die, they just flip out."
Received on Fri Dec 10 00:05:51 1999