Re: (ATM) Spiders

[aart@uiuc.edu (Aart Olsen)]

re diagonal shaking:

Ordinary spiders such as Novak's have torsional vibration because they're
radial but the effect is greatly worsened because of their tiny hub.  It's
not hard to fabricate a simple damping brace from the hub to the spider
vanes, in the shadow of the secondary to make the hub diameter effectively
as large as the secondary.  A disk of plywood with four blocks, with a tiny
dab of silicone glue attaching each to a spider vane, should do it.


Aart M. Olsen                aart@uiuc.edu                  217-244-4688
Library Systems Office              Univ of Illinois at Urbana-Champaign