[TheForge] lamp shade

[wmullett at bright.net]

If this is so Dave, then you should be able to put a square into the angle and tilt it without the tip rising up .... doesn't work!  The sies of the square will meet the angle legs and the tip won't reach the apex.
> 
> From: "David E. Smucker" <davesmucker at hotmail.com>
> Date: Fri Nov 3, 8:18 AM
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Subject: Re: [TheForge] lamp shade
> 
> I have been waiting for someone to raise this question.  I can't see how you 
> need anything other than a 90 degree angle for the vertical side pieces.  If 
> you take a horizontal slice through a truncated pyramid it will be a square 
> and those angles must total 360 and be 90 each or it isn't a square.  Now 
> the included angle of the piece across the bottom will be something less 
> than 90 and the angle across the top will be something more than a 90.  I 
> would do the top and bottom out of flat stock with tabs welded on to hold my 
> filler material.  Take a piece of paper and fold it into a 4 sided payramid, 
> the angle of the fold is still a 90.  Or am I missing something?
> 
> Dave Smucker
> 
> ----- Original Message ----- 
> From: "Janet Rivera Switzer" <tiquose at fone.net>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Thursday, November 02, 2006 10:24 PM
> Subject: Re: [TheForge] lamp shade
> 
> 
> > I'd sure like to know how to do the math to figure out what the angle 
> > really is
> > when you build a truncated pyramid. How did you come up with the 110 
> > degrees, Andy?
> >
> > Janet Rivera Switzer
> > blackbearforge.com
> >
> >>  I don't do a lot of light fixtures, but I'm doing one for my sister that
> >> has a lampshade in the shape of a truncated pyramid- four sided, tapering
> >> box, you've probably seen a million of them.
> >> The plan was to use light angle iron for the corner pieces, but obviously
> >> when you slant all four toward a "vanishing point", the 90 degree angle
> >> becomes not a 90 relative to the adjoining sides.
> >>
> >> Somebody on this list has dealt with this situation, I'm sure: do I heat 
> >> and
> >> flatten them slightly, or is it easier to make 110 degree angle with 2 
> >> plain
> >> flat strips, or what? Suggestions, ideas, ridicule, all welcome. :)
> >>
> >> Thanks,
> >> Andy Gladish
> >> elementfe.com
> >>
> >>
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