nine sided pyramid

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Project by Waldschrat posted 01-18-2011 08:04 PM 5002 views 0 times favorited 26 comments Add to Favorites Watch

This nine sided pyramid was a group project (three of us) and we had to make a Pyramid with nine sides out of MDF and the points all had to meed and the joints all had to be exact so it passed to gether with out any gaps, and the height and diameter was also to be met, which we did sucessfully.

The trickiest part was not the cutting/calculating but cutting such shapes and forms safely… requires jigs, simple jigs but effective and easy on the fingers.

I do not think it will ever be necessary for me to make another pyramid, but the project was more about the calculations (trig, angle functions) than about the use of a pyramid.

I thought this might interest someone or how it was calculated.

-- Nicholas, Cabinet/Furniture Maker, Blue Hill, Maine

26 comments so far

View KnotCurser's profile


2025 posts in 3065 days

#1 posted 01-18-2011 08:13 PM


While your plans are not readable (too small), I am in awe of your project – simply amazing!

What a wonderfully challenging test – I WISH we had something like this course in the USA! I am envious!

Great job on the exam – this looks like it came out perfectly.


-- Robert Rhoades WoodWorks / Email: /

View Dennisgrosen's profile


10880 posts in 3112 days

#2 posted 01-18-2011 08:22 PM

thank´s for sharing Nicholas :-)
it seems to go very well on the schoolbench if you have time to have fun like this
ups it was a school project…LOL

you finish in spring …right

take care

View daltxguy's profile


1373 posts in 3911 days

#3 posted 01-18-2011 08:22 PM

Wow, well done!
The math I am certain I could work out. What I always struggle with is how to remove wood exactly where I want it. I would like to hear more about how you cut the pieces and how you cut them safely and accurately.

-- If you can't joint it, bead it!

View ZeroThreeQuarter's profile


120 posts in 3054 days

#4 posted 01-18-2011 08:38 PM

interesting, the 9 sides is what changes things i think for most people. Someone on here who’s into turning wood would be more interested in this then most…

nicely done.
got any pics of the jig(s)?

-- Your mind, much like a parachute, works best when open.

View PineInTheAsh's profile


404 posts in 3265 days

#5 posted 01-18-2011 08:39 PM

Greetings Nicholas,

No place to run to, no place to hide!

Since everyone knows what a pyramid looks like—or should look like—these type projects are indeed an extremely tricky challenge. There is no bend, no hidden corners, no arch or turn to help or “fudge it.”
No creative angles to help you nudge into place. It’s either there or it’s not.

And this is all done using the revealing surfaces of clean, smooth MDF !

It appears you and your group did a superb job. Congrats to all.


View Gene Howe's profile

Gene Howe

10479 posts in 3425 days

#6 posted 01-18-2011 08:57 PM

That’s pretty cool. I too, would like to see those jigs.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View shipwright's profile


7980 posts in 2795 days

#7 posted 01-18-2011 09:09 PM

Interesting exercise. Nice job on the fits and angles.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

View Waldschrat's profile


505 posts in 3432 days

#8 posted 01-18-2011 09:22 PM

Ok Guys Thanks for the great Feedback!

I will post a pic tomorrow here on how I made the jig to cut the bevels, its simple but works great!

As far as cutting the out the pieces, There are a number of different ways, what We did was to cut out the triangles, with straight sides. Then the bevel on the base we used the table saw to cut. Then we built a Jig to hold the triangle to shove it pass a shaper with a rebate cutter head tilted at the propper angle. Then took the jig apart and built it backwards to shove it pass the cutter head rotating the opposite direction (of course we turned around the cutterhead so it would cut properly) as far as some pics, I will try and arange them tomorrow!

Thanks again on lookin in!

-- Nicholas, Cabinet/Furniture Maker, Blue Hill, Maine

View Waldschrat's profile


505 posts in 3432 days

#9 posted 01-18-2011 09:29 PM


No, I wish I were finished in Spring, I am not let off the hook that easy, I have my Theoretical exams in July and practical exam in September. I have to deliver my Mastepiece in Sept. too, so October I will be done! Hopefully!

-- Nicholas, Cabinet/Furniture Maker, Blue Hill, Maine

View SgtSnafu's profile


960 posts in 3268 days

#10 posted 01-18-2011 10:44 PM

Now that is really cool, and very well done. One can tell that a lot of work whet into planning, and creating this. I’d be one that would love to get a closer look at the calcs for this.

Thanks for sharing!

-- Scotty - aka... SgtSnafu - Randleman NC

View Dennisgrosen's profile


10880 posts in 3112 days

#11 posted 01-18-2011 11:09 PM

well at least you can relax one week in juli …LOL
hope the best for you

View nobuckle's profile


1120 posts in 2758 days

#12 posted 01-19-2011 12:37 AM

Sweet! The picture of the math was hard to read. Any chance of getting it in a PM? Knowing how to do this would help in a number of applications other than wood working.

-- Doug - Make an effort to live by the slogan "We try harder"

View Waldschrat's profile


505 posts in 3432 days

#13 posted 01-19-2011 11:18 AM

Ok, I will send/post the math stuff too! Its probably best if do it in english, it will take a little longer (day or so) and I will send it along.

-- Nicholas, Cabinet/Furniture Maker, Blue Hill, Maine

View Waldschrat's profile


505 posts in 3432 days

#14 posted 01-19-2011 02:56 PM

Ok just on the run here is the plan you need to lay it out (helps visually to understand)

the math I will have to do later….

-- Nicholas, Cabinet/Furniture Maker, Blue Hill, Maine

View patron's profile


13603 posts in 3338 days

#15 posted 01-19-2011 04:31 PM


-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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