A cube in a cube

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Project by derosa posted 08-24-2010 08:16 AM 2087 views 1 time favorited 4 comments Add to Favorites Watch

I’d previously seen one of these and decided to try making one, basically the outer cube contains an inner cube that can’t come out while both pieces are obviously not pieced together making it a mystery how the smaller one got into the bigger one. 4.50 at the local lumber place secured a piece of 2.5” thick mahogany that could produce 10 of these which was a good thing. The original I’d seen had a solid center block that had large dimples in it from the forstner bit that I didn’t like, turns out adding holes to the inner block increases the chance of the drill bit destroying the whole piece. The first attempt came out perfect till I over sanded and the inner block could slip out. The next 6 destructed at various stages of trying to square off the inner box or hollowing out the inner box, all of them evaporated in an impressive manner. The whole piece was finished with danish oil.

-- A posse ad esse

4 comments so far

View Jiri Parkman's profile

Jiri Parkman

953 posts in 4292 days

#1 posted 08-24-2010 09:29 AM

Nice and interesting.

-- Jiri

View rivergirl's profile


3201 posts in 3318 days

#2 posted 08-24-2010 02:47 PM

Okay- so how DID the smaller one get into the bigger one?

-- Homer : "Oh, and how is education supposed to make me feel smarter? Besides, every time I learn something new, it pushes some old stuff out of my brain."

View derosa's profile


1597 posts in 3315 days

#3 posted 08-24-2010 09:02 PM

To get the one cube in the other you use a forstner bit to cut away evenly on all 6 sides until there is only the tiniest of tabs connecting the inner cube to the outer which can be cut with a sharp knife. A smaller bit is then used for the inner to hollow it out. Hollow the inner cube after the outer first, if the bit catches any rough spots it will quickly destroy the whole thing, it’s also best to do the end grain first since it’s most likliest to catch. I ran the drill at 250rpms with a 2 1/8 for the outer box and 1” for the inner on a 2 1/2 cube. slightly smaller bit would also be easier but I liked the delicate look better with the sides being as thin as 3/16.

-- A posse ad esse

View DYNO360's profile


151 posts in 3345 days

#4 posted 09-03-2010 03:31 AM

Too Cool for School!

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