Cheap surface plate ?

I have just checked my 'granite worktop' plate and it seems to have developed a significant 'bow' several thou deep in the centre.

Neil

Neil,

This is worth a look

and, incidentally, many "Granite" worktops are reconstituted material; which will probably flow more than the natural stone.

Certainly worth checking from time-to-time

MichaelG.

I personally have destroyed a number of CRTs, and have NEVER had any trouble with "implosion" or flying glass, and have always released them "to air" by gently tapping the neck of the tube after removing the deflection coils etc, until I hear the gentle "Hisssssss" of the air entering the tube, after which the tube can be converted to whatever suits your purpose, in my case, landfill!!!

donhe7

donhe7

I spent some 30+ years in a Company that ran about 2,500 CRT's in all sorts of equipment. Have always broken the vacuum on tubes that went to the skip- which over the years was around a thousand. I used the re-gunners method of letting the air in slowly which is not what you describe.

Tapping the neck on one type of tube will cause a crack to run around the cone and the tube to immediatly implode, this is a very widely produced Philips ultra flat type with a 30" screen.

When writing a previous posting I considered describing a safe method of breaking the vacuum however there are so many other factors and there is nothing worthwhile to be gained. But there was the risk that someone would have been hurt. I would not advise ANYONE to break or even handle a CRT without being trained.

I would not advise anyone to try to recover parts from a CRT. You will not recover anything useful.

One day four years ago a new employee in a Company was told to skip a 19" CRT. He placed it in a skip and chucked a brick at it. He had multiple facial cuts from shards of glass but was very lucky not to loose his sight. Implosions can be very dangerous.

Billy