Re: [CAD_CAM_EDM_DRO] flat glass wasRe: re:Levelling large table

----- Original Message -----
From: "Dave Kowalczyk" <dkowalcz@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
>
> Well, depends how long he's going to use the table! Glass flows on
> a geologic timescale - something like 10 million years for a window
> pane to get 5% thicker on the bottom at "normal" temps.

I suspect that it is a bit quicker than this - Mediaeval and later window
panes are often noted to be recognisably thicker at the bottom than the top
and this is a concern in many churches where this flow has caused gaps to
appear between the glas and lead in leaded-light windows. In actual fact
though, I would be more worried in this application about bending of the
glass sheet, it has a very large area for 1/4" thick to be supported
horizontally. I would suggest that the supporting structure be made out of
some fairly strong stuff and for the glass sheet to lie on a very uniform
and well supported 'table' - perhaps made of the kind of stuff they use for
kitchen worktops.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk