Re-engineered Iris Diaphragm.

Intro: Re-engineered Iris Diaphragm.

Well i have decided to share with the world my newly engineered version of an iris diaphragm in the attempts to win a laser cutter, because i have a lack of tools and or money :( i cant make and post a lot of my ideas, BUT i tried my hardest to make this one because i couldn't contain myself any more. so i made it out of easy to use materials i could easily cut with a knife. so if i do win the laser cutter i will be posting more instructables and i will make a better iris diaphragm instructable for you to clearly see how it works.

Basically my new design is similar to the design people all over the world have been using for years in the fact that you rotate either the top or bottom disk  to make the iris open or close, also we will be in fact using blades but not even close to the kind of blades we have used before.

However mine is unlike any you have ever seen in the world before, in the fact that it can be any size and have anywhere from 3 blades to...... well how ever many you would need or want, and the over all design would stay the same no matter what. Mine also allows for you to open and then close it completely and when i say close completely i mean you can close it until there isn't any light allowed threw. and to top it all off the blades don't over lap thus creating no friction at all.

p.s. im sorry i couldn't post a video of it working because i just bought a camera i don't have a stand so i had to hold the camera in order to take the pictures but on the next step i will show it closing in each picture.

Step 1: Pictures of Iris Closing

ok well in this step, well its more like a page for you to see me closing the iris a little bit at a time.

Step 2: More Pictures and a Better Explanation

well on this page i will show you that the blades don't over lap. i also show you the different parts to the iris and the fact that it does in fact close completely. so basically this page should have been titled what the insides look like. i will explain how everything works and moves in the next page.

Step 3: How It All Works

OK so the way the whole iris works is that all the blades travel in a straight line back and forth, and the line they travel on is perpendicular to the blades angles bisector. look at the pictures below see how the iris is closed and then when it opened the blade highlighted only moved in a straight line to its right and so did all the other blades as well. these blades all travel in the grooves back and forth. the last picture show a better explanation of the key areas for plotting out how each blade moves angle A is found by first taking the number 360 and dividing it by how many blades you want so lets say 12 blades then that would make angle A 30, as in each blade will be an Isosceles triangle with angle A being the odd angle.

Step 4: Building It

well i don't think i can help much in building yours do to the fact that my design can be changed in size and blade quantity so i will give some pointers on how to build it, if you get stuck on your own just leave a comment and i will help you and or post an added update to show you how to go about doing whatever it is you have a question on. well making slides you can use a groove like i did or even a drawer roller would work to make for blades move nicely back and forth . when starting your build try to first figure out how big you would want the opening to be then figure out how many blades you want lets say you want 12 blades in your iris you want to make triangle with one angle being 30 degrees cause 360 divided by 12 blades equals 30 now you want to make your blades about as long as you opening is wide so for example you want to make an opening of 6in so make 12 Isosceles triangles with the odd angle being 30 and then use the bisector of this angle to measure out 6in like in picture below.

Step 5: Building It

To figure out where to place to slides or rails i simply drew out mine so that they wouldn't over lap each other to make it less likely to get stuck shown in the pic below when placing the slides i chose to put them at the ends of the blades just my preference but you can put them closer to the center of the blade and you could even shorten the blades if you want i'm just giving you a general guide line to building my iris. so if your opening to your iris is lets say 6in then the blade would only have to move 3in which is half the diameter of the opening so to add to this if you figure that your blade sits already 2in on a slide then your slide total would be 5in cause the slide would need to go the extra 3in look at my prototype to see what i'm saying. so once you figure out where the blade will be once it is opened all the way you can now figure out where the outside diameter of the discs will be.

The last thing would be making the pins for the top of each blade you want to put them on the bisector line i chose towards the middle of the blade you can move it either up or down the bisector line. to make the grooves for them it the same as the slides but depending on where you put the pins measure from the edge of the opening to your iris to where the pin is when both opened and closed and plot out a groove the measures the same. so lets say your first pin when the iris is closed measure .5in from the opening or 3.5in from the center of the opening you take this and times it by 2 to get a diameter of 7in you can draw out a circle with this diameter now do the same for when the iris would be open we would get lets say 1.5in from the opening or 4.5in from the center find your diameter by multiplying by 2 again to get 9in this is the distance where the pin will stop so draw out this circle too now you can easily draw out the grooves for your pins by draw out 12 lines 30 degrees off each other because we have 12 blades.

Step 6: Well Thats All for Now

well i think i explained it good enough but hey to me this was really easy to think up and design in my head before ever even building my prototype so i might not have explained something very well if that's the case please do not hesitate to comment i will reply or edit accordingly to help any one who needs it. i just ask that if you like my re-engineered iris please vote for me it would make me very happy and please leave a comment, i appreciate you taking your time to look at my instructables as this is my third one ever and if i can get some more tools to build my ideas i will post more instructables for the many! many! many! other things i have designed in my head.

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    25 Discussions

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    hitnrun

    Question 13 days ago

    I know its been a while for you, but the only point on the math would be is if there is an easy way to figure out the distance of where the pins are when the iris is open?

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    jordan21892hitnrun

    Answer 13 days ago

    The distance from where the pin is when closed as to open is the same distance as your radius of the circle you want it to open too. Because when the slide is closed it should be 0 from the center, so if i want to lets say have a 10 inch wide circle the slide would have to travel from 0 to the edge being half the distance of the whole circle (the radius) it would slide 5 inches. I drew up a quick sketch to hopefully better explain what i mean.

    20181004_084047_HDR.jpg
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    jordan21892jordan21892

    Reply 13 days ago

    If you are asking the point of all my math was to lay out the path, then yes most of the math is for that. Cause it can change depending on the size of the iris or quantity of the slides you have.

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    hitnrunjordan21892

    Reply 13 days ago

    I think i got it, and it was Pythagoras, i needed to know the distance from the center to the new position of the pin after it is opened. radius i got, and the position of the original point is r + Some value (p), so the radius from the center to the new point is √r² + (r + p)²

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    hitnrunhitnrun

    Reply 12 days ago

    That i got, i want a rail and pin method, but can they be directly on the opposite sides of each other.

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    jordan21892hitnrun

    Reply 12 days ago

    Yes it would probably work better than the prototype i built above where the pin and rail are not centered on each other.

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    hitnrunjordan21892

    Reply 12 days ago

    I have a dilemma, I only have so much space, the max space i have is just under 9 inches. I have figured the largest hole is 5 inches with the minimal amount of blades (8). The question is what is the minimum distance the pin should be above the edge? Can it be over the wedge on the other side? i.e. the wedge is 1/8 inch thick, the pin is the same, would it work with them being on either side of each other?

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    jordan21892hitnrun

    Reply 12 days ago

    You can't use two pins as it would want to bind or spin. One side of the mechanism must ride on some sort of rail system. While the other side runs on a rail system but must be able to rotate inside the rail as it slides. If you are stuck I can try and build one when i get home from some foam board I got using the measurements you provided. And post pictures and measurements of where everything is.

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    jordan21892jordan21892

    Reply 12 days ago

    You could use two pins on the rail side creating a line for them to ride along. With one pin on the other side of the wedge for the other rail that rotates. Total of three pins.

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    millikiani

    1 year ago

    Hello may i have your gmail
    I want to make an iris cutter
    Please help me

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    mosmond

    2 years ago

    This is f***ing awesome! You must have a gift for mechanical reasoning to come up with something like this. I think I have the means to make a nice wood or metal version. The difficulty is finding the time. But if I get a chance I'm definitely going to try this out. I'll let you know if I do. Thanks for sharing this - I seriously love it.

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    djblack739

    5 years ago on Step 6

    I love it. So creative and cool! I am going to try this with thinner triangles. Hopefully this will mean they need to slide less, and thus the diameter of the outside circle can be smaller (or at least the inside diameter can be larger).

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    jordan21892djblack739

    Reply 3 years ago

    In my instructable i said make each blade about the same length as the opening is in diameter, however if yoi can shorten them and still have enough stability to slide each piece then the outer ring would not have to be so big.

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    jordan21892

    3 years ago

    I would like to see any pics or videos if any one made one out of solid materials... I have moved twice sense posting this and have not been able to build a more solid one.

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    djblack739

    5 years ago on Step 6

    Question.
    Doesn't it make sense to have the pegs over the center if the slide rails to get the least amount if bind? Am I missing something? I have the slides and grooves, about to start figuring out where to put the pegs. Since they apply the necessary pressure for movement, is there a reason you put them closer to the center of the triangle even though the slide rails are at the end?

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    jordan21892djblack739

    Reply 4 years ago on Introduction

    No there isn't a reason for them in the middle other than the fact that is how i built it in my head and then built this a a first prototype. I was trying to use this to win a contest for a laser cutter so i could build and improve it and be able to make many of my other projects that unfortunately can only go as far as designing stuff in my head :( wish i had the money/space for tools to build all the things that i think of.

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    nox1468

    5 years ago on Introduction

    amazeing! i think i may want to build a tiny one and combine it with this (https://www.instructables.com/id/LED-Gun-Glove/) project!

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    jordan21892

    5 years ago on Introduction

    if you have any questions about how to make your own please don't hesitate to ask me, and i would love to see yours if you made one :D i'm currently trying to find a place to use some tools to make a new one out of wood.

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    Neo-Archer

    5 years ago on Introduction

    sorry? but you are not the only one who has invented such a cool stuff - http://www.youtube.com/watch?v=3w7SSUFHjWE

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    jordan21892Neo-Archer

    Reply 5 years ago on Introduction

    hmm i never seen that video and i searched every where trying to find something like this one i built. well i did build mine almost 2 years ago so that explains why i didn't see the video cause the video is only about a year old. well darn i was hoping i had something unique.