Re: [ATM] Re:Tees instead of triangles

["David Harbour" <scarab2@cox.net>]

To all-

I see, now. I shoud have been more thorough in looking back over this
thread. I thought we might be talking about tubes' structures- you guys were
talking about mirror cell supports, and I had no clue what was going on. But
the drawings made everything clear. I have seen the "T" arrangement before,
so it must be doable. Thanks for the link to drawings- made everything clear
instantly.

"A picture is worth a thousand words; a demonstration is worth a thousand
pictures"

(David Anthony Harbour)

Dave

P.S.- What is the advantage(s) of Ts instead of triangle plates?
-

---- Original Message ----- 
From: "Olivier Biot" <olivier.biot@versateladsl.be>
To: <atm@atmlist.net>
Sent: Sunday, May 15, 2005 2:43 PM
Subject: Re: [ATM] Re:Tees instead of triangles


> 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
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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