Heptagonal antiprism

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Project by ellgee posted 05-10-2013 05:26 AM 2200 views 0 times favorited 5 comments Add to Favorites Watch
Heptagonal antiprism
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With a pentagonal antiprism handle.

“Just practicing” to make it in a decent wood, this one was pine sides & MDF lid.
So I painted it hammer-finish brass, red gloss, and flat black inside.

Have a piece of black bean that might suit this shape, as it’s a regular stripe.

I mentioned to one of you LJs a while back that I sometimes like doing compound angles
“for fun”, so this is just to show an example.

5 comments so far

View Monte Pittman's profile

Monte Pittman

30612 posts in 3395 days

#1 posted 05-10-2013 10:25 AM

Your compound angles are awesome. Bet that took a lot of math to figure out. Great job.

-- Nature created it, I just assemble it.

View BritBoxmaker's profile


4611 posts in 4093 days

#2 posted 05-10-2013 12:35 PM

Having had fun with a square antiprism myself its good to see I’m not the only one who is fascinated with things geometrical. Your angles look perfect. Look forward to a Black Bean version.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

View Hawaiilad's profile


3378 posts in 4078 days

#3 posted 05-10-2013 08:35 PM

Nice box…would love to see a video on the building of one of these.

-- Larry in Hawaii,

View lightweightladylefty's profile


3630 posts in 4769 days

#4 posted 05-11-2013 03:37 AM

That certainly looks way beyond my comprehension! My compound miters generally end up being compounded mistakes . . . just a fraction of a degree multiplied by 16 can create quite a mess! The glue-up would have me pulling my hair out!

Thanks for sharing what someone who knows what he’s doing can achieve!


-- “Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” Benjamin Franklin -- Jesus is the ONLY reason for ANY season.

View ellgee's profile


71 posts in 2984 days

#5 posted 05-11-2013 09:00 AM

You could try it with math,
or you can draw it in sketchup (which is way easy) then
try to get him to show you the dihedral angles (not so easy)
and/or the exterior to interior dimensions’ differences.
There may still be some trial and error.
It was ever thus, ay ?

I have a cuboctahedron I am not showing anyone. Maybe the next one.

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