hatching-egg-coat-hook

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http://www.instructables.com/id/hatching-egg-coat-hook/

Food Living Outside Play Technology Workshop

hatching egg coat hookby mikeasauruson January 8, 2014

Table of Contents

hatching egg coat hook .........................................................................................................

Intro: Hatching egg coat hook .................................................................................................

File Downloads ...........................................................................................................

Step 1: ..................................................................................................................

Step 2: CAD it up ..........................................................................................................

File Downloads ...........................................................................................................

Step 3: Laser cut ...........................................................................................................

Step 4: Sanding and refining ..................................................................................................

Step 5: Paint ..............................................................................................................

Step 6: Glue + sand again ....................................................................................................

Step 7: Attach guide and mounting cleat + wax guideway ............................................................................

Step 8: Wall protection + mouting ..............................................................................................

Step 9: Hang your coat! ......................................................................................................

Related Instructables ........................................................................................................

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Comments ................................................................................................................
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Author:mikeasaurus michaelsaurus.com

Play Editor + Community Manager here at Instructables!

Follow me and try a few of my projects for yourself!

Intro: Hatching egg coat hookAn egg shaped coat hook 'cracks' open to reveal a baby bird when a coat is hung, when the coat is removed the egg closes up again. This fun coat hook is made with1/8" [3mm] craft plywood and was made on a laser cutter.

When I first saw this design on the Grand Illusions Youtube channel, I really wanted to know more. The brief review did not go into the design and researching plansonline was fruitless, so I had to puzzle it out on my own. My first attempt was with traditional tools (bandsaw, drills, hand tools) on 1/4" [6mm] plywood, but the resultswere clumsy and bulky. Instead I decided to design in CAD and use a laser cutter to get the precise geometry I wanted. I've included my CAD and laser cutting files soyou can make your own.

Ready to make a fun coat hook? Let's get cracking!

You're welcome to download the CAD file I made below.

File Downloads

egg hook2000.dwg(57 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'egg hook2000.dwg']

Step 1:I started by looking for a simple clip art style bird that I could modify. I just did an image search for "baby bird cartoon" and got heaps of results.

I was looking for an image that either had wings spread, or would be easy enough to modify, either in an image editor or by making photocopies and sketching on top printed image.
https://www.google.com/search?q=baby+bird&espv=210&es_sm=93&source=lnms&tbm=isch&sa=X&ei=Iq_NUvK4NouDogSlpYBQ&ved=0CAkQ_AUoAQ&biw=1920&bih=911#es_sm=93&espv=210&q=baby+bird+cartoon&tbm=ischhttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://youtu.be/Ah-lNT2lPh0http://michaelsaurus.com/http://member/mikeasaurus/http://member/mikeasaurus/


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Step 2:CAD it upI used AutoCAD to puzzle out the design and create the vector outlines used to laser cut the pieces.

bird:After modifying the bird to the style I wanted (wings open), I started a new CAD file and imported the bird image.

There's no way to convert a raster image (JPG, BMP, TIFF) to a vector, but you can easily trace over your image in CAD to create a vector image. Using the SPLINE (other programs may have this function, or similar function using a 'pen tool'). I made an outline of the bird image I modified on one layer, and the details of the inside eye and the curve of part of one wing) on another layer. With two layers I can differentiate cutting or etching when I laser cut later.

To keep things tidy and prevent accidentally deleting a portion of the outline I created a BLOCK of my bird outline.

egg:After making the bird outline I could start on the egg. I started with a basic oval shape, then scaled it up to roughly match the size of my bird outline. Placing the egg ov

the bird CAD block, I designed the egg crack sawtooth, then played with the location and size until I was happy with a design.

The CAD bird block was re-sized a few times to get the placement to line up with the egg design, and the travel distance required when the egg cracked open. This wathe toughest part of the build, as the bird size and travel distance kept needing to be changed to meet the design intent. Doing this in CAD really allowed me to explorefew different design options.

After a few iterations I made a glide track inside the lower portion of the bird (which would be hidden behind the egg), and created a few mounting brackets the matchethe interior diameter of the racetrack. Then copied out the final design into a new CAD file and saved it for laser cutting.

You're welcome to download the CAD file I made below.

File Downloads

egg hook2000.dwg(57 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'egg hook2000.dwg']

Step 3:Laser cutAfter saving my CAD files I was able to import them into Corel Draw, the program used to print to the laser cutter. If you're using a laser cutting service you can just sethem the CAD file I shared above. This cracked egg coat hook can be easily flat packed and shipped.

After importing into Corel Draw I made 2 layers, one for cutting the outline of the pieces and one for etching in some detail. I used an Epilog 75W laser cutter and cut mpieces out on 1/8" plywood. I used the following settings for the laser cuts:

Power: 40Speed: 40Frequency: 500

After the shapes were cut I ran a second pass with for the etching of the beak, eye, and portion of the wing.

**Note: You should etch first and then cut. Cut pieces can fall off the parent material and become misaligned, which will cause the etching to be misaligned.**
http://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=fileshttp://www.instructables.com/files/orig/FFU/IMSO/HR1711RT/FFUIMSOHR1711RT.dwg?utm_source=pdf&utm_campaign=files


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Step 6:Glue + sand againThe top of the bird was aligned with the top portion of the egg and glued in place.

Even though I sanded the faces of the pieces before painting, I decided to sand down the back face of the egg where the sawtooth "crack" was to make a gentletransition for the sliding action.

Step 7:Attach guide and mounting cleat + wax guidewayAfter the bird is glued to the top of the egg, the bottom of the egg can be attached to the bird guideway.

A sandwich of oval wood cutouts fitting inside the guideway was made and screwed into the back of the bottom portion of the egg through the bird portion guideway. Aoval shape is important to have inside the guideway as it keeps the sliding action linear. Do not tighten the guideway wood sandwich, it needs to be secure but looseenough to allow a sliding action.

A cleat was screwed into the top of the back of the bird shape. This will be used to hang the coat hook.

The basic assembly is complete. To allow the self-closing action an elastic band was wrapped around the top cleat for hanging and the guideway sandwich installed othe bottom portion of the egg. To aid in the sliding action when the egg opens stiff grease ( or wax, or bar soap) was worked into guideway to lubricate for smoothoperation.


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Step 8:Wall protection + moutingTo protect the wall from damage and marks felt furniature pads were placed on the back of the cleat, and on the guideway sandwich.

A small cleat was mounted to the wall, and the corresponding cleat on teh back of the egg easily slides into place to hold the coat hook securely to the wall.


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Step 9:Hang your coat!You now have a fun coat hook that breaks open when you hang your coat up for the day!

Have you made your own hatching coat hook?I want to see it!Share a picture of your version of this project in the comments below and be awarded a 3-month Pro Membershipon Instructables.com and a digital patch.

3-month Pro Memberships remaining: 10 / 10

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Comments

3 comments Add Comment

watchmeflyysays: Mar 31, 2014. 4:32 PM REPSo. Cute. And. Clever.

bricobartsays: Mar 31, 2014. 3:45 PM REPI'm gonna use this concept, to make A CROCODILE VERSION! ;)

chriswooten57says: Mar 31, 2014. 3:09 PM REPOMG this is so cute. I see so many on here making things with laser cutters. Gosh it must be so much fun to use of those babies. So do you have a childwho is going to use this sweet hook? I hope you entered it in the Egg Contest too. I will go there to vote also
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