how to make a 12 leaves mechanical irirs

8/20/2019 How to Make a 12 Leaves Mechanical Irirs

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http://www.instructables.com/id/How-to-make-a-12-leaves-Mechanical-Irirs/

Step 1: Getting some pinsOk, so what the heck is the bicycle chain for? well, every iris leaf, has two pins, one of the is a pivot pin, and the other is a travell pin, wich runs in a slot.So, in this project we will use the bicycle chain pins, ;)

So, what you need to do is to take your bicycle chain, and dissasembly several times, in order to get 24 pins, as the images show.

I put my chain tool in the vise to have a better handling.

Every chain link is componed by two pins, two little rings, and two little flat pieces, we will only use the pins, but save the other little pieces, cause they can be veryusefull, and you never know when you gonna need them.

Once you get the 24 pins, clean them up very well (i use alcohol), to get all the oil and grease out, and we are ready for the next ste


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Step 2: Cutting the leavesNow let's make some leaves!

Ok, first print the leaf template, and glue it to the copper sheet.Now cut the leaves!

Regular scissor will do the job

Once you get them all cut, remove the paper, and we are ready for the next step!


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Step 3: Soldering the pinsOk, now comes the fun part, we will solder two pins in every leaf, you must be carefull of where you place the pin, you have to guide yourself using the blank.

I had no time to make a jig to precicely position the pin in every leaf, so i did it "by eye", anyway, we dont need surgical precision for this one.

Now, are you wondering ¿how do i solder those little things? in case you are wondering, i'll show you how i do it.

-First, i fix my visegrip on the vise-Then i fix the leaf with the pin in position, in the visegrip-The you have to apply some soldering paste, be generous.-Heat it with the torch, just enough to get the paste melted-Then, cut a piece of soldering wire, about 15 mm long, and twist it in a "U" like shape-Then, wrap the wire around the pin base.-And finally, heat everything untill the solder gets melted, use a soft flame, there's no need for exesive heat. Do all that, and 20 minutes later you will have your 12 copper leaves set.


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Step 4: Making the ringsNow lets make the two rings.

First, print the rings template, and glue them in to the mdf boards.

-The ring with the runners, is for the 15 mm MDF borad, and the ring with the 12 holes, is for the 3 mm MDF.

-Then cut them with the holesaw

-Sand all the edges

-Drill the holes ( 4 mm holes)

-Cut the runners in the table saw (or router table, or with a dremmel, etc) i set the cut dept to 10 mm.

And that's all, now lets go to the assembly part!


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Step 5: Assembly it!Ok! so now we have our 12 copper leaves set, and two mdf rings, let´s put them all together.

First, take the cd tube case.Then put the 15 mm MDF ring on itThe put the first leaf, with the tracking pin in a slot (the tracking pin is the one tha's a little offset, the other one is the pivot pin)The put the second leaf under the first onePut the 3rd leaf under the 2nd......and so, untill you get the 12 leaves set up.

the put the 3 mm mdf ring on top, make all the pins fit with their respective hole (you can use some stick, or screwdriver to help) and YOU ARE READY TO GO!

Lets see a video of the iris in action! i must said this one works like a charm, opens and close very smooth.

http://www.instructables.com/id/How-to-make-a-12-leaves-Mechanical-Irirs/step5/Assembly-it/


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Comments

1 comments Add Comment

dombeef says: Aug 18, 2011. 11:39 AM REPWow, good job on the instructable!

I might plan on making this in the future!
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how to make a 12 leaves mechanical irirs

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