Re: [ATM] Tees instead of triangles

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

A picture is worth a thousand words, Kevin, or Alan.

Provide a link for us, please, so we can see this breaking of the rules of
well established engineering tradition (all trusses, Pratt, Warren,
Serrurier, etc., employ a triangle, sometimes repeated, as in my large
mounting):

http://www.atmsite.org/contrib/Harbour/Sym.Eq.Mntng.html

All of the loads in a "T" would be concentrated entirely in the joint of the
elements, it would seem to me, unless I am not understanding what you are
saying. Provide us with a link to a picture to edify us, please, if it is
not inconvenient.

The 25" "training telescope", at Cornell university, a Cassegrain, has a
tube that looks almost identical to mine, except that it employs a Pratt
Truss (diagonal strusts are essentially rods under tension, cables, so to
speak). Help us with a picture (I have one on a disc somewhere).

Dave

----- Original Message ----- 
From: "Kevin Whitefire" <chaosopher23@yahoo.com>
To: "Alan K. Henderson" <alankh@ev1.net>; <atm@atmlist.net>
Sent: Sunday, May 15, 2005 3:10 AM
Subject: Re: [ATM] Tees instead of triangles


> Welds tend to be a little softer than the base metals.
>  Other than that, unless it was welded by a drunken
> novice, it's probably OK.
>
> Kevin
>
> --- "Alan K. Henderson" <alankh@ev1.net> wrote:
> > Can't remember where I saw this, but somebody out
> > there has a large aperture
> > scope where the "triangles" are made from 1" square
> > tubing welded together
> > in a T shape. The tee would be made from either two
> > tubing sections (one
> > vertical and horizontal section each) or three (two
> > horizontal sections,
> > welded to either side of one end of the vertical).
> > If I use the two-section
> > design for my upcoming project, the center of the
> > hole for the "triangle"
> > pivot bolt would be only .22 inches from the weld;
> > assuming a quarter-inch
> > bolt, that's 1/8" distance between the edge of the
> > hole and the weld. Is
> > there any reason why drilling that close to a weld
> > (or welding that close to
> > an already-drilled hole) is a bad idea? If so, I can
> > always go with the
> > three-section alternative, even if that means extra
> > welding.
> >
> > Alan K. Henderson
> >
> >
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> >
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