Re: [ATM] Re:Tees instead of triangles

["Olivier Biot" <olivier.biot@versateladsl.be>]

Alan,

I'd take care of balancing those Tees, in such a manner that their COG 
coincides with the hole you intend to drill.

You're planning a 9-points cell. The issue is that those triangles are very 
"flat", hence the position of thecentre of gravity (COG) may be rather 
critical.

Another probably easier cell is the lever-based 12-points cell, which may be 
easier to build (almost identical length levers in some configurations, like 
the 3 skewed H geometry).

Best regards,

Olivier

----- Original Message ----- 
From: Alan K. Henderson

Ah, I should have said those three magic words: nine-point cell. For a 16" 
full-thickness mirror. Here is a side-by-side sketch of a traditional 
9-point cell (taken straight from Plop output) and the cell with tee-shaped 
supports (mirror support pads and support bolts drawn to scale).

http://users3.ev1.net/~alankh/Triangles-Tees.gif

The mirror is thick enough that it doesn't need an 18-point cell. But the 
triangles/tees will have to support 50 pounds, so the well-established 
engineering tradition will require some tweakage.

Alan K. Henderson 


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