ard at p850ug1.demon.co.uk
Tue Oct 4 15:34:03 CDT 2005
> J.C. Wren wrote:
> > Some useful information here:
> > http://repairfaq.ece.drexel.edu/sam/crtfaq.htm#crtcir
> Rats, I almost checked there before posting too, but didn't recall any
> such section on the site!
> Interestingly, that info implies that it's the steel strap around the
> perimeter of the CRT's face which does the implosion protection, and
That strip, normally called the rimband over here, is certainly for
implosion protection in some CRTs. But I suspect the double faceplate is
part of the implosion protection too.
> bit at a time. Given the huge thickness of the CRT face* I would be
> surprised if heated wire could cause it to break (the faceplate's
Actually, one of the easiest ways to get stresses in glass is from uneven
heating/cooling (but I suspect the wire you used didn't get the glass
itself anything like hot enough for this to be a problem).
> another matter as it's so thin, which is really why I was being careful
> about the heating). Just a case of being careful though I suppose.
> *I recall breaking TV CRTs apart as a kid and the glass at the front is
> amazingly thick. Bricks bounce off happily without damaging the screen
> at all.
Work out the force on the faceplate due to air pressure (which you can
assume is 14 pounds per square inch). It's pretty large for TV-sized CRTs!
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