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Re: [ATM] Best locations for 4-Pt. Wiffletree edge support PLS.
Bob Drew wrote:
> With a 200 lb mirror, it must be very sturdy to locate the mirror, so
> I'll
> start conservatively. Given the required strength of the fabricated
> components, for now, I would prefer not to enter experimental territory
> with a sling for this weight of mirror. ( Altho I suspect that a solution
> may lie there ). Trying to avoid an expensive re-do.
You will be entering experimental territory, whether you like it or not ;-)
The exact distribution of loads will matter very little unless you take
effective measures to make sure to avoid friction forces (or similar forces)
acting in undesired directions - in particular out of the plane of the
mirror. Teflon pieces or similar against a rough glass edge won't make it,
of course. With a sturdy wire cable (inside a low-friction sheath), at least
you know it is strong enough by a very large margin...
More specifically, as you say "The saw is ready to hit the metal", what have
you in mind?
If you solve the friction problem, using symmetric wiffletrees supporting at
+-22.5 and 67.5 deg will give you a load distribution somewhere between the
2-point +-45 deg support and the (somewhat better) 180 deg sling - there
seems no reason to expect there is a significantly better 4-point
whiffletree solution to be found.
N O
> That is why I am seeking some input from those mechanical engineers and
> math
> genius' and atms on where they would place the 4 support points on the 2
> pivoting arms?
> bob
>
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