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Tiffin Box from Tuna Cans

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A tiffin box is a small lunchbox used to carry a tiffin, or light meal.  The lunchbox consists of a stack of steel or ceramic compartments for each food item.  According to wikipedia, the term originated in colonial India, and today in Mumbai there exists a complex network tiffin-boxed lunch deliveries on a massive scale.

I really like the utility and look of these lunchboxes, so I wanted to try making my own.  Tuna cans seemed like the perfect compartment -- the only problem was getting them to nest nicely.  I was really impressed with how well the can-shaping jig worked.  It pulled in the bottom of the can and made a uniform ring just above it.  After that, the cans fit together really well, and all I had to do was add draw catches and sand everything...and eat the tuna.
 
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Step 1: Make the Can-Rolling Jig

The can rolling jig consists of two old door hinge pins and a hose clamp.  The heads of the hinge pins nest with each other.  By applying pressure with the clamp and rolling the can, we can raise a lip on the can's side.  Check out the embedded video in the next step to see it in action.

Building the jig is very easy.  In a piece of scrap 1x1 wood, drill two holes to accomodate the hinge pin shafts.  Space these holes so the pins are roughly parallel when the heads are nested.  Slip the hose clamp over the pins and stick them in their holes.  

The top pin will stick out further than the bottom on account of the heads being nested.  If everything works out, this should be enough so you can clamp the vise grips to the top pin and turn it through a complete revolution.  You may want to trim a bit off the bottom shaft to give yourself more room to work.

Use a vise to clamp the wood and hold the whole thing steady.  You're ready to roll.
nomosoft3 years ago
This is one of the best Instructables I've seen, and the first one I've liked enough to comment on. This project really captures the spirit of DIY simplicity. The hinge pin roller is brilliant.

I'd like to see this improved to have a liquid-tight compartment for soup or a beverage. Do you think a little food-grade silicone on the rolled bottom of one can, and a ring of the same inside the can it fits into would do the trick?
For a silicon (RTV) seal.

Use petroleum jelly on the bottom can's top rim inside an out. Apply an even thin coat of food grade RTV to the bottom mating can's under/outer mating surface. Let the can sit and dry/set up till a thick skin forms. Then mate the two together with a little pressure. Enough to move the RTV but not enough to get a metal to metal contact. Let set for 24 hours. Trim excess RTV wash and enjoy water tight seal.

This is a "Perfect" fit and you will have to put the cans back together in the order and alignment you made them.
you should do an instructable on that, it would make a great addition to this one
You could also look into buying a pre-made silicone washer. Medical/ FDA grade are available. It'd be easier to clean/ replace (I run my moka pot's ring through the dishwasher with no significant breakdown after dozens of washes), and wouldn't leave you with any particles in the soup. Just make sure the clamps are quite tight!

Might be possible to rivet a ring into the bottom of the next tier. Then you wouldn't have to be too cautious about verify the seal each time. Or raise a ring on the next tier inside the circle of the seal. Or soldier a guide ring around the outside....

Great instructable!
gkern nomosoft3 years ago
Is there a Instructable on how to make the tin rollers?
yomero1 year ago
this is one of those great instructables where everyone can lettheir imaginations run and make upon it, i for one loved it,
Congratulations!
Your 'ible was featured in Make magazine online today!
Here is the link to the article.
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yoyology1 year ago
We use tiffins for our kids' lunches. Love the way you made yours. Kudos!
Appollo643 years ago
This looks great! I want to try to make one, but I'm confused of how the welding rods hook into the latches. Also, is there another way to get the cans to stay together: I don't have any way to solder metal?
Rivet them instead if you don't want to solder. Also, be careful if heating food cans to a high temperature w/ a torch - I think they may release toxic fumes (so do this in a well ventilated area).
EPOXY!!!! Just don't glue your fingers together!
calischs (author)  Appollo643 years ago
Nothing too fancy for the latches. The rods fit into holes on the sides of the draws and are bent so they don't come out. See the picture.

I'm sure there are other ways to get the cans to latch together. Some of the other commenters have good ideas.
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Thanks! The pic really helps.
megahurts3 years ago
I love the pin roller. I'm going to use this idea to create some storage pots for the 1001 loose screws, nuts and bolts rolling around the bottom of my workshop draws and tool boxes.

Regarding burning off the protective film in the bottom compartment. I'd be very careful about what sort of food you keep in there, anything slightly acidic/alkali is likely to attack the raw steel, I'd suggest a couple of coats of enamel.
I echo your idea on this mega, I'm thinking it would be a handy way to recycle cat food cans as well. They easily nest already for retail display, and a single plastic snap on lid could cover the top! You can stack them according to size, with different 'details' on each can (flat washers, lock washers, star washers, etc.) Be sure to label them when you sort.
Tip on storage: I hot glue a sample of what is in each of my coffee cans for bigger bolts and screws for quick and easy locating what I want at the moment.
feltonite3 years ago
I've always admired the tiffin boxes ever since I first saw them on tv. This is a great instructable.

I have one question, though. I'm wondering about the lead content in the solder and welding rod. Would it be safe to use in a food container?
Hey Felonite, I think I can help answer your question. In the past solder was made lead-based and would be indeed posionous, but now most solder on the market is Lead-Free and probably safe to use as listed in this 'Ible
I see no reason you wouldn't use silver plumbing solder, it's used on potable water pipes, so perfectly food safe.

I have some MIG wire that looks like that, it has a flux coating on the outside, that I wouldn't want near my food. I recommend actually getting brass rod.
rhm32 years ago
I dont know if I will ever make the tins but I will for sure use your idea for the roller !! LOL, Thanks
ibmarkib2 years ago
You could use those extra large cans, of I think chicken or tuna. This would keep the same form, which I love, and still have a way to make it larger if need be.
Cpt. Caleb3 years ago
Fantastic! All that Metal makes it look very pre-war and extremely durable.
A great 'ible and one of the best looking by far.

Well done Sir.
vigfus3 years ago
What sort of welding rod is that? It seems to have a brass-colour, I've ever only seen rods (made for gas welding) with copper- or raw-steel-colour. Also, the rods I've seen are a bit too soft for this application.
This confuses me to no end... ;)
Appollo643 years ago
Does anybody know where I can buy the hinge pins?
You can buy the entire barrel hinge / pin assembly at a hardware store, or (if you have one) check at your local castoff store / Habitat for Humanity Re-Store for used ones.
soundmotor3 years ago
I am amazed you were able to get enough down force to bead with the hose clamp so far back on the rollers. Well done!
mstrpete3 years ago
Hey, this is a great project-I'm going to adapt the method to make a small cookpot/carry case for my old Svea camping stove. One question, though-it looks as though the upper bolt on the can-roller has been ground down a bit. Was that deliberate, or did it happen as a matter of course as you worked with it?
calischs (author)  mstrpete3 years ago
Thanks, I'd love to see pictures of what you make.

You're really observant. I did grind the head on the upper hinge pin a bit to try to control the shape a bit. I didn't have much luck at this, and maintaining the rotational symmetry of the pin head was difficult. The original shape actually worked pretty well for me, as the cans "click" into place with each other.
Kalibar073 years ago
Love this Instructable.. i will definitely be making this for my packs.. ABSOLUTELY FANTASTIC
jerazo3 years ago
Best instructable i've ever seen
kalpavrksa13 years ago
Awesome project. I've been to India 6 times. Just recently returned this past week. I always pick up tiffins for friends here at home. One question: I am a little confused about the method for making the lid. Can you elaborate a bit?

Thanks,
Kalpa
Scolova3 years ago
Very Nice! I might try this in the future.
I remember watching the History Channel show about food packaging and delivery where they showed how effectively these carriers were used in India. Workers \ business people pay a monthly fee and locals cook the food put it in the tiffins and riders come pick them up and deliver. One great thing is the reduction of trash, i.e. packaging, these just get washed and reused over and over.
athein Scolova3 years ago
Exactly! The Dabbawallah is how they are known. The Discovery Channel did a nice photo journal on how they live and work and how tiffin lunch boxes are embedded in East Indian culture. http://dsc.discovery.com/videos/discovery-atlas-india-tiffin-boxes.html And if you don't want to make your own tiffin lunch box then they are readily available. This is my 4-tier tiffin from Happy Tiffin.
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antonia273 years ago
I have an even better idea than tuna cans! I was worried about the tuna residue getting on the food (no matter how carefully you clean them), so I started looking for different containers. I was going to buy a set of metal food containers or see if an office store would have something but then I found out that my dad has a huge collection of metal tea containers from Uptown Tea. They are perfect for this project and come in a variety of sizes.
calischs (author)  antonia273 years ago
Cool! Would you be able to upload a picture of one?
Sure- first i need to gain access to a soddering iron bc mine isnt working. If u need a pic before then just go to uptown tea's website
Metallurgy3 years ago
If you could, couldn't you use soup cans that are the same size diameter as the tuna can? You can have a bigger storage compartment, instead of several smaller compartments.
duckkirk3 years ago
Hey awesome instructable, if not for food it could be used for fishing tackle workshop bit and bobs and whatever you can find
I'm amazed by people who can see some hinges as tin rollers truly inspiring might try one. Got enough time with summer holidays.
big al 10483 years ago
- wow, i am super impressed,where i live in the OUTER 'rondac's of upstate NEW YORK, it will be 4 months before i can get to the coffee can w/ 20/30 door hinge pins, but this will go on my maker list
thanx Big Al
jackfaciale3 years ago
same as nomosoft ! best i ve ever seen ... i love the final touch wich gave them this particular look
octochan3 years ago
I might not use this to hold food, but I think it would a perfect for storing small, loose things like screws, nuts, bolts, paperclips, rubberbands, hairpins, beads, buttons and suchlike. Also, the rolling jig is absolutely the most ingenious thing I've seen in a long time! but I think that you can get tuna cans already manufactured to stack neatly and stay together.
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