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Posted by Chris Baetens on May 30, 2004 10:19:43 UTC

No, the bolt and the aluminum plate, nor the epoxy or glue hase to be removed AT ALL....!!
Attention : not all sorts of glue can be used..!
At Urania whe have our own vacuum bell jare (700 mm diameter!)testing all sorts of materials under the bell jar at a vacuum aboout -5 Torr. (The lowest whe can reach).
Whe have done these tests the see howe some materials react at these extreme conditions. Lots of materials react very well, in fact most of them are usable.
At Uranie whave also have a colleague mirror grinder(Joris V.), working at (former) SABENA and they also doing a lots of tests on the subject. Joris gifs us a lot of information in case of doubt.
Maybe due to the fysical shape of the bell jare it MAY be possible one has to remove all the things you've glueed on the back off your mirror.
A second reason is that the operator off the bell jarr is unaware of all these facts and do not want to take any risks.


Telecope making course at Urania

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