# Make your own Borromean rings! (You know you want to.)

This is an instructable showing you how to crochet your very own Borromean rings.

You could also also make the outside by knitting or sewing a tube if you wanted. I crocheted them as I thought knitting may be too stretchy and sewn ones would take some refining before they stopped being all wrinkly and untidy looking.

Borromean rings are a knot (in the mathematical sense) where the three rings cannot be separated even though no two rings are linked. Also the space in the centre is in the shape of a Reuleaux triangle - a shape of constant diameter but inconstant radius.
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## Step 1: Gather tools and materials.

You will need;

a crochet hook (2.5mm),
a pair of scissors,
a large-eyed needle,
Duct tape,
yarn (DK),
flexible tubing,
newspaper.

A different weight of yarn can be used as long as it isn't too chunky, but you'll need to adjust your hook size.
I used a different colour for each of the rings, but you could do them all the same, or make each one striped.

## Step 2: Cut the tubing.

Cut the tubing into three equal lengths, I cut them to about 35cm.

I wouldn't reccomend any shorter than this as it would be difficult to get the finished rings to lie flat.
I would also not reccomend making them a lot longer as you'd have to crochet for days but if you didn't mind this it would make them easier to assemble.

## Step 3: Start to crochet.

Tie a slip knot and chain until it overlaps by one chain stitch when wrapped around the tubing.
Join into a loop with a slipstitch through the first chain after the slip knot.

Do one chain stitch then single crochet into each of the chains in the loop. When you get back around to the first continue with single crochet in a spiral.

Keep crocheting until it's roughly the same length as the tubing, then cut the yarn leaving plenty for sewing the ends together later, and pull through the last crochet loop.

## Step 4: Insert tubing.

Insert the tubing into the crocheted sleevy thing you just made.
destructopop1 year ago
Crochet and maths is the most natural combination of crafts I've ever seen. :)
hammer98766 years ago
Great Instructable! Yarn AND math. The right side of my brain is feuding with the left side and creativity is winning! Yea! Oh, and it is Duck tape (it says so on the inside of the tape) not Duct tape. Ha ha ha!
Ah Nuts! I've gone all addlepated from a' staring at the picture...
canida6 years ago
These are so cool!
I love your beautifully clear explanations. (Didn't know the interior was a Reuleaux triangle, either.)

Fantastic!
helenleeks6 years ago
i can't wait to make one of these for the 2yo great niece. and my father in law the retired math teacher is gonna love it! thanks maplesyrup! this is "sweet"!
6 years ago
ha maplesyrup = sweet xd
rachel6 years ago
This is great, and very well explained. Math & craft, just like babair sez, they're an unbeatable combination.

(I have to admit, on first glance of the title only, i was half-expecting some Lord of the Rings thing, but now I know that "Borromean" != "Boromir".)
Bitsi6 years ago
I love it when math and craft come together! :-)
bobise6 years ago
would be a great baby gift
6 years ago
its best to start them early in puzzles and math : )
flio1916 years ago
wow, this is pretty sweet, i could imagine this being a nice bracelet, or if you flattened it a little, a coaster. +1
polar bear66 years ago
what do you use borromean rings for.
6 years ago
ahh lol i see now, i read the text lol. its a mathematical failure of sort, like them hovercrafts made of aluminum and old CRT screens.
joejoerowley6 years ago
Wow! This is really Cool! Great Instructable!!!!