Re: [ATM] wire spiders

["tony gondola" <acgna@comcast.net>]

Think of it this way. Wire is very strong when the force is applied along 
the long axis (in tension) and has little resistance to forces applied 90 
degrees to that (limp noodle). So.....the closer you are to taking the loads 
in tension the stronger the spider will be.

Tony


----- Original Message ----- 
From: "Jan van Gastel" <jhm.vangastel@wanadoo.nl>
To: <atm@atmlist.net>
Sent: Wednesday, June 28, 2006 12:33 AM
Subject: [ATM] wire spiders


>I have been searching for information on the internet about the angle
> between the wires of a wire spider. I found some postings, including one 
> of
> Mel Bartels and one of Nils Olof Carlin, telling there has to be 'some'
> angle, but not how large that should be. Nils Olof, pointing to bike 
> wheels
> suggests, if I understand him well, that the angle doesn't need to be 
> large.
>
> I want to use Mel's crossing system on the trilateral 20 incher I am
> building at the moment. When I make the central hub and the side bars 150 
> mm
> (6") long, the angle between wires at the crossing point will be about 35
> degrees, the angle between hub (or side bars) and wires about 27 degrees.
>
> Is this the way to go, or should the angle still be larger? Or is this
> overkill and is a smaller angle also OK?
>
>
> Jan
> http://home.wanadoo.nl/jhm.vangastel/Astronomy/
>
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