The Ultimate Dinosaur Costume





Introduction: The Ultimate Dinosaur Costume

This Instructable documents the construction of Jamie Price's dinosaur costume.  It is over 10 feet tall and 14 feet long!  There are over 140 individual parts that were created.  It is built from a flexible foam with a welded steel/aluminum support substructure.  Most of the parts were cut using a CNC router with a few cut by hand using a dremel and regular router.  Total build time was around 130 hours at a materials/machine time cost of $550.

This is my entry into the ShopBot Challenge and the Make it Real contest.  If you like it, please rate highly and vote in both contests!  With a ShopBot Router and a 3d printer in my shop, I could build more crazy items (more robots and costumes). Also, I am a member of a Nashville robotics club which could make use of the CNC router for various projects.

For scale, the room in the picture is 25' x 25'!   This is a HUGE costume.  Look for this costume at Dragon*con in Atlanta 2012!

Step 1: Design

I wanted to build a large-scale dinosaur costume that would standout.  First, I found several 3-D dinosaur puzzles on the internet.  Once I found one to my liking (look, geometry, etc), we scanned the parts into a design software (can be anything as long as you can output a .dwg file for the machine shop later).  Once scanned, the parts were output onto heavy card stock and constructed into a prototype model.  From there, you have to figure out what parts are going to move, where you will be within the structure, and how you will hold it up.

Since most of the models are designed to be static with no moving parts, it takes several revisions to the parts to make mounting plates, get rid of parts that impede movement of parts, etc.

Note - Take note of the slots that plug into each other.  They need to allow for the thickness of your foam material (sometimes several layers)

Once you get this all done, the parts will be ready to be cut by the CNC router (a spinning tool that is computer driven that can cut out exact parts from large sheets).  The machine shop will "nest" the parts (get as many parts onto a sheet as possible which saves waste and $$).

You could cut these out by hand, but that would take FOREVER.  Best to use a CNC Router for this!

Step 2: Cutting Parts

Once the design is finalized and you have your machine file (check with your machine shop for type of files that may be used).  It's time to get the foam.  I used 1/2" thick white closed cell poly foam plank.  This stuff came in 4' x 8' sheets and this project took about five of them.  I paid around $150 for the foam and another $100 for shipping (ships flat in huge box via truck).

Once I got the foam delivered to the machine shop, we were ready to cut!  The CNC router cuts this stuff like butter as long as you cut around the part in a counterclockwise method (same with the hand routers).  Below is a pic of the first batch of cutout parts.

I am sure if you are a glutton for punishment, you could cut all this out by hand, but it would take a LONG time and your tolerances would be off.  This is the beauty of the CNC Routers!

Step 3: Structure

You will notice that the foam parts are quite limp without any structure and won't support their own weight.  You have to build a skeleton for the skeleton ;)

I used 1/4" thick steel rod for most parts and 1/8" for the smaller parts that weren't load bearing.  For this step you need a welder, a vice to bend the rod, and a method of cutting it.

As you can see from the pics, the steel rod was shaped to match the part, a groove is made part way through the foam piece to house the steel rod, then an overlay part glues over it to hold/hide the steel.  To cut the grooves, I used a router on the larger ones and a dremel router on the small ones.  You could also make the grooves part of your file for the CNC router.

For some overlay parts, I used 1/8" thick white abs plastic.  For others, I used 1/2" foam to cover up the steel structure.  You can see examples in the pics of different structural parts.  Every dinosaur is different, so different pieces will need to be reinforced, but the methodology is the same.  For extra heavy parts (like the neck that supports the ribs, arms, and head) I doubled up the 1/4" rod to make a structural beam.  This still allows some movement, but supports the weight nicely.

NOTE - Superglue (cyanoacrylate) is the ONLY glue that will adhere this closed cell poly foam!

Step 4: Supporting Rig

As your pieces start to slowly come together, you will next be faced with the challenge of how to support/wear the costume.

I aquired a used military surplus backpack that was then modified.  As most of the weight of the dinosaur is over the front, you need to add a belt to the front of the backpack so that the pack is attached around your torso.  This allows the weight to ride properly on the waist and shoulder straps.

I used aluminum square tube to create the frame that attaches the dinosaur to the backpack.  I fired up the chopsaw and welder to create the parts.  After welding, the parts were then taped off and painted either white or black depending on what needs to be seen or disappear.

Note the slanted aluminum plates on each side.  This is where the lazy susan bearings plug into that allow the legs to move.

Note - You can weld aluminum with a Mig welder IF you use a teflon gun liner, and an oversized tip.  BUT, you MUST use shielding gas or it won't work.  Aluminum wire is required.

Step 5: Final Assembly

Now that you have tons of parts, it's time to put them together!  LOTS more superglue! Some of the parts that were structural (legs, pelvis) had to be permanently assembled as they were load bearing.  The rest of the parts are made to friction fit into the slots.  Other than the legs/pelvis, the other parts can pack flat in a large zippered carry bag.

The neck and spine attach via two aluminum angle plates that attach with large bolts and wing nuts.  This then attaches to the backpack frame.

Note - Some hardware was fabricated to help take the weight off of certain parts.  I used steel fishing leaders to help carry the overhung load that the arms placed onto the rib.  The leaders were connected from the rib to the neck.

Step 6: Finishing Touches

This costume plays on the use of light and dark to make certain parts of it "disappear."

For the outfit, I bought a black military surplus flight suit.  I also bought black cotton gloves, black socks and shoes, and a black mesh head cover.

Any part that you want to be not noticed, make it black!

Also, to cover up the spine attachment hardware, I created pieces of white foam that velcro over it.

A good project is all about the details!

Step 7: Party Time!

Once I had the crazy big dinosaur costume done, it was time to take it out on the town!  Several pics are below.

Note - A costume this large isn't for the faint of heart!  You have to think about where you will be able to take it, and how you will transport it, and where you will store it.  You will need at least one person to come along to help you assemble it and guide/protect you if in a crowded place.

This costume will be worn at Dragon*con 2012 if you would like a closer look!

This is my entry into the Instructables ShopBot Challenge and the Make it Real contest.  If you like it, please rate it highly and vote for it in both contests!  I have several other large scale costumes in mind (aeronautical themed) as well as some new robots I would like to build.  With a ShopBot and a 3d printer in my shop, I could make some CRAZY stuff!  ;) 

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Finalist in the
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Runner Up in the
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    29 Discussions

    This costume is AMAZING!!! Do you have the DXF file for sale or would you offer it? We would like to make this for our son for halloween this year. Also where did you purchase the foam? All I can find is EVA foam. Do you think Fomular sheathing would work for this project?

    Wow - if you didn't win, you should have. Are you willing to make the plans available? This is a huge amount of work. I can't even imagine starting from scratch.

    i am planning a similar costume for halloween this year but im using cardboard instead of foam any tips you could give me on this build. ive had experience ih cardboard masks and props but id like to hear any advice you have for this prodject.

    It would be cool if you added poles to pivot the arms where they attach to the body. That way, you can claw other people!

    This is incredible! You should totally provide the plans for this ;) or sell them at least!

    This is amazing! Very very well done! Have you ever seen Mr. Bones (Tim Seeber) from Louisville, CO he creates similar large dinos, he calls them puppets. I gave you my vote, and I am rooting for you! Just fantastic!

    Wow... How on Earth are you gonna get through Dragon*Con in that?!
    Let's be honest, my first thought was "Yay! I get to see it!" ;D

    1 reply

    :) Very slowly... I wore it to a huge party and the crowd just kind of parts as you go through it. I will wear it around the Sheratton and the rave parties at dragon*con one night... (also, be on the lookout for my wife in a simplified mini version....shhhhh)


    THANKS! ;) I am crossing my fingers for that router....currently, I have to pay a lot of $$ any time I want something cut which cuts down on impulse or spontaneous ideas and prototyping that I could be doing. That router could be epic!

    Really, really cool! My 3.5 year son would go totally ape for one of those (in smaller size of course...) Also, I'm no paleantologist but I've looked through countless dinosaur books with my son and T-Rex only had two fingers on his front arms... Who cares though! It's a frickin dinosaur!

    1 reply

    Thanks! You would be correct on the fingers... also, dinosaurs aren't made of foam and metal ;)

    This looks to be a terrific build but shouldn't it be called a dinosaur skeleton costume?

    This is so Cool! You should think about selling these in kit form! Who wouldn't want a giant predator model you can wear? Come up with a new version once a year.. You could get rich.
    A Black Widow or Tarantula would be cool. ;)

    You have my vote as well.

    2 replies

    Thanks! Make sure you vote in the ShopBot contest as well! I would do anything to own one of those! :)

    I hope you get the shopbot, man. This thing flipping RAWKS! And don't listen to those dinogeeks! It's totally a T-Rex if you say it is. ;-)

    Hey all

    Great Awesome Job here I have to say.

    Brainstorm after seeing this & the video you know. Is the below a good idea maybe if so I will atempt my first instructable for publishing here after.

    You know people I'd like to take this T Rex Skeleton Costume that's made and add body and skin to it and then go out and take it dancing after

    I'm not up on what T Rex looks like and some say T Rex had feathers being that T-Rex was related to our modern birds we have now .... So if I was to make a real life real in the skin T-Rex I need a body look a like to make it thought.... Thank you. .... more to follow....

    Very cool - but you've actually built an overscale Deinonychus, rather than a small T-Rex! Looks great, whatever the name.

    2 replies

    Isn't it a Velociraptor (with what looks like a T-Rex head)? It does have the nasty claws that stick up on the feet...

    I just want to start by saying that this is incredible and I would love to be able to have the time and ability to make one of these.

    It does appear to be a mixture, though. T-Rexes have two-fingered hands and the claw sticking up is a trait of a deinonychus, troodon, or velociraptor and not the kind of the carnivores.

    Also, for the smaller (hypothosized) pack dinosaurs, the claw that is sticking up is the inside claw (big toe position) and not the middle one.

    I voted for this, though! Stuff like this should be encouraged!