How To Cut a Wooden Pyramid???

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Forum topic by ChefHDAN posted 12-30-2013 03:47 PM 1861 views 1 time favorited 4 replies Add to Favorites Watch
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798 posts in 2273 days

12-30-2013 03:47 PM

Topic tags/keywords: question joining

I need to build a pyramid platform base to test structures for this years Destination Imagination Challenge. I built the structure test device several years ago but this year the structures are to be set on this pyramid before having the weights added to test strength to weight ratios.

I thought it would be simple but two attempts so far have only yielded fire food. I’m working with 1/2” plywood and cannot for the life of me figure out the compound cuts to pull this together, and I’m sure it’s any easy trick for someone with rafter experience. Any help or advice is greatly appreciated

-- I've decided 1 mistake is really 2 opportunities to learn.. learn how to fix it... and learn how to not repeat it

4 replies so far

View Dallas's profile


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#1 posted 12-30-2013 03:49 PM

-- Improvise.... Adapt...... Overcome!

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#2 posted 12-30-2013 03:55 PM

I think that LJ Jim Jakosh did a blog on this type of cut using the bandsaw.

Edit: Here it is :

-- "there aren’t many hand tools as awe-inspiring as the #8 jointer. I mean, it just reeks of cast iron heft and hubris" - Smitty

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Jim Jakosh

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#3 posted 12-30-2013 04:04 PM

This table on making a pyramid should be very helpful and you cna do it on a compound miter saw:

I made some solar light stands just like that but I’m not at home to see my calculations. I know I did have to figure that angle going up to the peak in 2 planes but I can’t remember the process That Jansson link should help you!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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798 posts in 2273 days

#4 posted 12-30-2013 09:40 PM

Thanks Dallas, that calculator got me almost dead on, a few 1/2 degree tweaks here and there and a few tries later & I got a perfect one, fortunately I found some 2’ square pieces of 1/2 cabinet ply so it was a wood investment in learning a new skill, really hard to believe what really looked like an easy build was such a challenge, thanks to all for the help!

-- I've decided 1 mistake is really 2 opportunities to learn.. learn how to fix it... and learn how to not repeat it

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