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Re: (ATM) Spiders


> this non-radial geometry stops all
> rotational flexibility and hence vibration! It can, however, not be
> realized with wires and tension!

Yes, it CAN ! Just use wires instead of rolled steel as described in
Texerau. Granted, wires won't be exactly tangential, but they will
be OFFSET from the center, tremendously increasing the stifness and
resistance to rotate (this is akin to having somewhat smaller diagonal
holder to which wires _are_ tangential)
<html><pre>
     \          /
      \        /
       \ ---- /
       |\    /|  holding bits; they are bolted to secondary holder,
       |/    \|   fixing the wires to it
       / ---- \
      /   ^    \  wires
     /    |     \
    /     | secondary holder with cutout "V" grooves (see Texerau)

</html></pre>

Note that even though wires are not radially positioned, the oposite 
ones _are_ parallel.
This scheme has strength MANY times comapred to those radially mounted
spiders. Makes you kinda wonder why people don't use it more often 
(even commercial spiders, those with reasonable reputation, are stil 
made in grossly inferior form of radial geometry).

Bratislav

PS I've got the feeling that we already discussed this one ...?