Advanced Media Studio

Shelves for ITP Locker

During the summer I was trying to figure out the best way to organize the huge amount of stuff I had at ITP into the three small personal storage spaces allotted to each student. There's my toolbox (which I found on the street and quickly outgrew), there's my blue bin on the rolling shelves (also outgrown), and my locker. I like to keep valuable things in my locker, like my multimeter, ATX power supply, Arduino, PhysComp kit, books, etc. One day, while I was removing the contents of my locker for redistribution and reorganization, Ariel Nevarez showed me the inside of his locker. He had purchased a small shelving unit from Ikea that fit perfectly onto the back surface of the locker, hanging there by two screws that fit into two holes. Perfect.

So, with an idea in my head, last week I made shelves for my locker using the laser cutter.

It wasn't as hard as I expected. First I measured the locker-- depth, height, width, distance between holes on back surface, distance between each hole and nearest side, distance between holes and ceiling and floor. I forgot to measure the size of the locker's opening, which could have been a problem, but wasn't (lucky me!). Using Illustrator, I used the line tool to make the dimensions of each component: a back surface, two brackets to support the shelves, and three shelves. The back surface and brackets are joined using a box joint (or the make-it-work-for-the-laser-cutter joint, as Andrew Buckland pointed out). The top shelf is simply laid on top, and the two smaller shelves slide onto the brackets using interlocking joints. Everything had to match up distance/dimension-wise. In Illustrator, the snapping and measuring systems helped immensely. I've never made anything so precise and had it work.

I applied glue to the box joint and clamped it so it would stay together and be more sturdy. It holds a fair amount of weight. I like modular structures, so having the option of using or not using each of the three shelves was key.

If you want to make your own, here's the downloadable .pdf (wordpress won't let me upload an .ai file): shelves

Here are instructions for how to build it:

0. Get a piece of 1/8" thick masonite with minimum dimensions 18" x 26". Try to get one that's not warped, and if it's even 1/32" wider than 18" shave it down or it won't fit in the laser bed. The bed is 32" long, so make sure the masonite doesn't exceed that length.

1. Download the shelf.pdf and change it in Illustrator if you want. If you change it, make sure you know the parameters assigned by AMS. Get the pieces cut at the AMS or another laser lab.

All the pieces.
All the pieces, in order from left/right, top/bottom: bottom shelf, back piece, top shelf, bracket 1, middle shelf, bracket 2

2. Check to make sure all the pieces fit together, which shouldn't be a problem because the laser is so precise, and the file is accurate. This build works in such a way that you can see that all the pieces fit without having to glue them. The two small shelves hold the structure together.

shelf_link01

shelf_link07

3. Glue the brackets to the back piece. The back piece is the one with boxy edges and two small holes in the surface. The brackets are identical, but make sure you glue them in the correct orientation in relation to the back surface or the holes will be too low and you won't have any space on the top shelf. The holes are towards the top, as are the arms of the brackets. Don't use too much glue, and only apply glue to one component (either the back piece OR the bracket). Wipe off any excess glue that squeezes out of the joint. Notice which surfaces of the joint fits together; those are the parts you want to apply glue to. Clamp the piece as in the photo below, covering as much surface area of the edge of the joint as possible. Make sure the relationship of the bracket to the back piece is 90 degrees, or the smaller shelves won't interlock well and the box joint won't be sturdy. Leave it for 30 minutes, then do the other bracket. It's best to leave the whole thing to dry overnight, but I got impatient when I made it and waited just an hour. If you're impatient too, move to the next step.

shelf_linkGlue

4. Try out the smaller shelves. Each one should fit into either set of slots. Make sure the top sits well. The top is optional to glue down. There are a few pieces I didn't realize I'd need until I was in the build-- supports for the joints, pictured with the screws in step 5. I made these with the jigsaw (sorry they're not included in the original .ai file). They're roughly 1/4" x 1/4" x 3", and they go on the inside of the back piece/bracket joint towards the top. Glue and clamp these to make the joint more secure.

shelf_link06

5. Cut small square or round pieces out of 1/8" thick masonite or another material (sorry these also weren't included in the original file). These will secure the small screws that will be inserted into the back piece. The heads of the screws will go into the holes at the back of the locker, and the whole shelf system will hang off these screws. Find two screws with threaded shafts no longer than 3/8", and about 3/16" wide, as shown below. Test the heads in the holes at the back of your locker. The ones I used are flat on the underside, which catch the hole better. Drill a 1/8" wide hole a little more than halfway through the rough surface of the masonite squares-- don't go all the way through. Decide if you want the rough side of the back piece facing out or not. Screw one of the screws through one of the holes in the back piece until the tip comes through just enough that you can feel it with your finger. Apply glue to the rough surface of the squares, making sure to get inside the hole. Place one of the squares onto the screw until you feel the tip of the screw go into the hole you drilled into the square. Using a hand-held screwdriver, turn the screw while putting pressure on the square, until the head of the screw is almost flush with the masonite. Putting pressure on the square while screwing will help squeeze the two surfaces together, bonding them well, making it less likely that the screws will get ripped out by the weight of the shelves or the crap you put on them. Repeat with the other screw and square. (the red splotch is blood!)

shelf_screws

6. Take all your stuff out of your locker. Put the shelf in and get the heads of the screws through the holes in the back. This takes some maneuvering.

shelf_inserted

shelf_insertedCU
Notice the support brace and little square in use.

8. Put all your stuff back in.

shelf_finished


0 comments

Film Drying Cabinets and You

By Simon Pinter

We have all sorts of fun toys to play with at the AMS, on a daily basis. My personal favorite is our ICG 380 drum scanner. Without a doubt it makes the best film scans in the world. Using an oil mounting process, film comes out of the machine wet and we needed to find a way to dry film sheets in an enclosed, dust free environment. A few weeks ago, the big cheeses issued a challenge to me: we want a film drying cabinet big enough to hold two 8X10 sheets of film. The cheapest we could find was $700. Not one to pass up an offer to play with fire (our laser cutter), I henceforth set out to do just that.
The design phase consisted of determining a few fixed dimensions. I knew it needed to be tall enough to hold two 8X10 sheets at an angle to drip dry and deep enough to make such a tall cabinet as stable as possible. I also knew our laser could not cut material bigger than 18"X32" so there was the size limitation.
The cabinet needed to allow a constant airflow, but not allow dust particles to enter. Both the top and bottom of the unit have a baffle system that allows air in but not large particles of dust. For the finer particulates, a carbon filter slides easily into place over the intakes. You will notice that the design for the top intakes is different than the design of the bottom intakes. This was simply an example of me showing off.
Using the AMS Laser Service Template in Adobe Illustrator, I layed out my files on four 18X32" sheets.


sheet one: fixed wallsPicture 2.png

sheet two: baffled feet
Picture 3.png

sheet three: door and handles
Picture 4.png

sheet four:top and bottom
Picture 5.png


You will notice the common theme of inch long tabs on nearly every piece. I call them dove tails, which I am sure is making some veteran woodworkers cringe, and I use them to join edges when working with acrylic. This method makes gluing (which was done with super glue) a lot easier because it automatically squares all edges and allows the parts to stand on their own before the glue is dry. Also, the more surface area the glue touches, the stronger the cabinet will be. To create these forms, I start with a large rectangle, and then add or subtract my dove tails using the illustrator pathfinder.
The door is of a sliding variety, with handles designed to look like brass knuckles—just in case things get dicey in the Studio. The door is as tall and wide as the cabinet itself, and can be completely removed to allow film to be hung without contact while inside the box. It slides in a deep channel that helps keep out dust and makes it extra hard to open and close.
Inside, there are overhead rails from which the film will hang. Alligator clips will accommodate the easy insertion and removal of films.
The baffle system is a method of keeping dust out but allowing for constant air flow. This illustration shows how the top and bottom baffles work. The blue is air flow and the red is dust. The heavier dust gets trapped as the air is forced up.

Untitled-1.jpg
This is a view of the bottom baffles intake and exhaust.
_MG_8224.tif
This is a view of the top baffle exhaust as well as the film hanging racks.
_MG_8222.tif
This is a view of the top baffle intake as well as a close up of the dovetailing.
_MG_8225.tif
And Finally, in all of its glory:


Just in case anyone was curious, the acrylic (I needed four full 18"x32" sheets) was $120. The vector length for the whole project was 1700” (roughly 3 hours of cutting time) and for those doing the math, .25” acrylic cut at this length would cost $207 on our laser. Total design time: 5 hours. Total build time: 15 hours.


0 comments

4x5 Camera Build

Gandhi once said, "Be the change that you want to see in the world." Folding 4X5 cameras are too expensive. And the really cheap ones can not really do what I need them to do for my work. I knew I could do better. In the Summer of 2008 I set out to build a 4X5 camera body that would accept standard lenses and film holders and perform as well as a commercially available model for significantly less money. I wanted the front standard to be able to rise and fall, swing, and tilt. The rear standard needed to do the same with the exception of swing.

Lets start with the design phase. I first had to determine my building material. It needed to be both rigid and light and thin enough for our laser to be able to cut it cleanly. 1/4" hardwood seemed to be the best candidate but I did flirt with the idea of using acrylic. I wanted to jazz the camera up so I went with a combination of maple and cherry wood. I knew I would be making a few mistakes along the way so as I designed each of the camera's components, I would make prototypes out of scraps that we had lying around. The metal parts, the bellows and the ground-glass and frame had to be purchased or salvaged.

The camera was designed in sections in Adobe Illustrator in the AMS template. I split the design into front standard, rear standard, bottom standard (for tripod mount), side brackets, and plastic parts. Initial design ideas included a camera that could fold into itself and other very precise movements that I found would be impossible without the ability to fabricate my own metal parts in house. I ultimately decided to use a swappable bracket system that controlled all of the camera movements and facilitated partial folding. The design is reliant on friction based movements. The standards were cut from sheets of cherry wood and the brackets were made from maple.















0 comments

Diorama!


While many may think that we at the AMS sit around in the summer plotting ways to make students' lives more difficult with new guidelines, the truth is we are busy tormenting ourselves by making projects that test the limits of the lab.

I have chosen to make one of my summer projects a miniature diorama.

When I think of a diorama, images of the Museum Of Natural History pop into my head. I wanted creatures caught forever in a dynamic moment inhabiting an environment of my making. I realized that this project would span most of the services we provide here at AMS, so it seemed like a perfect thing to put op on the blog. Hopefully it will inspire anyone who is interested in this sort of thing to come on down and give it a go. Also, I hope that my stumbling process will help others to come up with better ways of pulling this off.

Enjoy!

STEP 1 : RESEARCH

I started out by doing a bit of research on dioramas in general so i could find my favorite flavor.

I found that the Museum of Natural History had my favorites, but I liked the attention to detail and scale of some of the military themed ones as well. The best one I found was the Halo 3 diorama that the model makers at WETA Workshop created for a website that corresponded with the release of the video game (http://halo3.com/).



halo3diorama-thumb.jpg




STEP 2 : PLANNING

plans.jpg I did some really simple visual outlines of how I wanted to build this. By looking at the big dioramas, I knew that I would need to use three of the Advanced Media Studio's services. The laser would build my enclosure, the large format printers would print my matte painting for the background, and the 3D Rapid Prototyping service would handle the monsters themselves.

I decide that 10 inches high by 10 inches deep should be a reasonable size for having around the house, and 18 inches wide should give me enough room for the creatures, allowing me to build models big enough to show considerable detail. I've already done some sketching here for the background as well. It is important to keep in mind differentiations in terrain so that he poses of the creatures reflect that. having a boulder in the middle or a hill on one side would affect my 3d modeling considerably.



The next phase was my favorite part, creature design. I had some fun little dino-like things kicking around in my head for a while, so decided that they would be perfect for this. I knew I would be modeling them in 3D and adding a lot of detail, so I wanted to make this made up creature as anatomically correct as possible. I wanted these creatures to look like sleek runners, so I looked at a lot of horse anatomy and some fantastical creatures to boot. I've learned that even a superficial understanding of the way muscles work will add a layer of realism to any creature model.



Then I drew out the sketch that would guide my modeling and detailing process. I tried to create a realistic muscle structure without getting too bogged down in detail. If this model were for film/animation, I would use this structure to model working muscles under the "skin" of the creature. Since this project is purely sculptural, this sketch is just a reference. I strongly recommend this phase, even if it seems excessive. When you begin to detail the model (as I will do in ZBrush), "real" looking muscles will make your job much easier.

anatomy.jpg



STEP 3 : MODELING, PRINTING and BUILDING

Then using a rough outline of the image, I take it into Maya to begin modeling. Setting it to the SIDE view panel, I use it as a reference for the shape of my creature. There are alot of tutorials on setting up image planes for modeling reference. A search for "image planes in Maya" will bring back tons of hits.

screen_maya.jpg
Building the object, I make sure to slice it in half down the x axis, then mirror the geometry on that axis. This forms a very basic and symmetrical 3d mesh of my first creature. I export it as an OBJ file.

Picture 3.png
Then I import the File into Pixologic's Zbrush. In ZBrush, I can use the Wacom Tablet (my favorite) to draw/sculpt directly on the model with pressure sensitivity. This recreates the feeling of actually sculpting clay, giving the artist unparalleled control over organic modelling. Because the model is symmetrical along the x axis, Zbrush can automatically mirror my brush strokes as I make them, cutting sculpting time in half. This is definitely the fun part, and I spend an afternoon detailing the model down to the texture of its scales.

drothzbrush.jpgThe model is detailed in Zbrush

This stage is where my anatomy drawings really come into play. By referencing the muscles I can give the creature, though totally fantastical, an element of physiological realism. I pose the creatures in ZBrush as well, which bends the contours in an extremely fluid and realistic way. I pose two of the creatures and send them off to Maya, where I can better check their integrity and save them as VRML files. These VRML files are then sent ot Zprint, the software that communicates with the Rapid Prototyping machine.

drothyar2.jpgThen the model is posed and exported as an OBJ to MAYA


Picture 1.jpgIn MAYA the models are checked and saved as VRML files for printing


I decide to paint the background in Corel Painter 10 using the lab's Wacom tablets. I've settled on an alien desert. The color palette for this will affect the creatures' coloration as well. I know that when I print the image, I have to cut it as well to fit into the box, so I keep that in mind when drawing. I plan on curving the sides along the box to avoid showing the inside corners, giving the illusion of being in the environment. I have to make sure the length of the image gives me enough room to do this, so I add a few extra inches on the sides to be safe. I print the final image on the Epson 9800.


matte_diorama1.jpg


IMG_2872.jpg

Next I made the enclosure file in Adobe Illustrator. I draw out each side of the box, with tounge and grove edges for gluing together. Then I send it to the laser for cutting.

cutting.jpg
Because I want light to be able to shine through the enclosure, I choose to make it from clear plexiglass, about 1/4 of and inch thick. With some acrylic cement, I soon had most of my enclosure put together.

IMG_2877.jpg

The models are now done and need to be infiltrated. This makes them hard and not as easily chipped or broken. Through testing I have found that the Zcorp Zbond infiltrant creates a glossy finish on the model while other infiltratns give more of a matte, sandy finish. I have found that even after priming the model with spray primer, the difference in these two infiltrants comes through, and the matte finish is much easier to paint.

IMG_2881.jpg
I use an old, broken terrain model as a stand for the one creature, infiltrating its foot directly on and binding it to the base. Then I spray primer on the models and get to painting. Painting miniatures and maquetes is an art unto itself, and I have found that the best way for an amateur to learn is by watching. DVD extra documentaries (anything done by WETA Workshop such as The Lord of the Rings or King Kong) are a big help, and I have found that there are tons of model train hobbyists and war-gaming enthusiasts who provide tutorials online. My personal philosophy is to layer as many thin coats as possible, creating the illusion of the semi transparency of skin. By keeping your brushes wet and taking your time, you can achieve nice gradations between different parts of the body, giving the model dynamic skin that reflects physiology rather than a flat tone. The best reference is your own skin, of course, and the knowledge of what can change on it and underneath it depending on environmental conditions.

IMG_2882.jpg

For these guys, I wanted to show that the skin around their legs and feet is in contact with hot sand and receives more sunlight from reflections off of the bright ground, so I gave it a darker coloration. The skin on their back is brighter to reflect heat from sunlight rather than absorb it. I also played around with different skin patterns, ones that might emulate the dry cracked ground that they would sleep on. These guys have bony skullcaps for dominance/mating rituals, aerodynamics and defense. Whether or not these things have actual scientific grounding is technically irrelevant in a fantastical creature, but attention to detail and a sense of "story" built into the model gives it a life of its own. In my opinion representations of fantastical creatures need that attention just as much (if not more ) than real ones.

IMG_2886.jpg

In the spirit of drama, I decided that showing these two creatures nimbly walking across an environment was not enough. One of the great things about the best dioramas is the sense of conflict and story. The famously referenced "squid and the whale" installation in the Museum of Natural history shows us drama on an incredible scale, an epic battle taking place in a world that most of us will never see. Because I do not see these two creatures as predators, dont want to have them chasing something down to eat it. I decided that one of nature's most exciting and emotional tales is the defense of the young against a predator. Which means I would need a baby creature and, of course, a predator threatening it.

Creating the baby involved more thought than simply shrinking down the adult models. I wanted its muscles to be less developed, its skin slightly less weathered, and its features to convey a feeling of innocence. In ZBrush I enlarged the eyes, shrunk the horn on its head, and smoothed out many of the muscles. I also made the feet larger and the pose less sleek, to give a feeling of awkward inexperience.


Then I had to decide on a predator. I went into my mental catalogue of creatures and decided on a more old-school, "pulpy" humanoid beast. Something like and alien bear, this creature comes from a friend's design. To me it harkens back to movie monsters of the golden age of cinema. It has a look that is at the same time terrifying as well as primal and blank. Its large, lumbering and aggressive, and would sort of hide amongst the rocks and lunge out at careless prey.

hakkla_ref.jpg
hakzbrush.jpg

This one has gotten ambitious and is hoping to get into a fight. Its armor, natural weapons and endurance means that delivering one major injury and then tracking the wounded animal across the desert could result in a weeks worth of meals. The two runners would survive by using their speed to escape, but that would mean leaving the clumsy baby to die. The scene we see in the diorama takes place in the moment after posturing and threatening, when one of the runners (the mother) is going to charge the predator before he can raise his claw for a swipe. Its like the discovery channel on another planet.


STEP 4 : PUTTING IT ALL TOGETHER

So now I have to finish the enclosure and pose the monsters on it. I use simple modeling clay for the ground, because I want to be able to mold the terrain and change it. Most modeling tutorials would recommend using foam or something more solid, but I want flexibility. I lay down all of the clay first, and then i wedge in more broken pieces of other models for rocks, including the base of the charging mother. I also use the free standing models to put in the footprints.


IMG_2953.jpg

Then I lay down some glue on top with my hands and put in sand on top. After it dries I dump off the excess and fill in the blanks by adding glue and repeating the process. The result looks like this.

IMG_2952.jpg
IMG_2962.jpg

Most of my work is done now. I just have to put it all together and light it! I put the top of my plexi enclosure on and shine a desk lamp through the "ceiling". The effect is just what I was hoping for. The clear plexi allows light to shine through and the background print acts as a color filter and a light diffuser, giving the scene a grim mood.


IMG_3079.jpg
IMG_3080.jpg
IMG_3084.jpg

IMG_3078.jpg

STEP 5 : AFTERTHOUGHTS

Overall, I find myself pleased with the fruits of my labor. That being said, there are some thigns about my process that I might change.

First, I would sand down some of the models a bit more after infiltrating them. I avoided this in order to keep some of the fine deatils I added in Zbrush, but to be honest, some were lost in the printing. Our new RP poweder did give me some scales and skin texture, but not all of the detail amde it. sanding the model down a bit more wodl ahev made it easier to paint and would have fully removed the sandy skin texture.

Also, I would have made another enclosure to go around the first one with a light built into it. Using the desk lamp is fine, but for presentation, one would want the diorama to be able to function solely by itself.

From an artistic perspective, I would have modeled in even more nature drama. I love my lumbering bear monster, but having its arm raised for a swipe or its legs pumping for a chage would have heightened the visual impact.

I learned a lot throughout this process, and I reccomend this sort of cross-service project to anyone. The AMS lab has many uses for artists of all kinds, and mixing and matching the services succesfully can stretch your creative limits in amazing ways.








0 comments

Laser Cut Truss


IMG_9578.jpg
The voronoi truss, or vTruss, was executed as both a display piece for the ITP Spring 2008 Show as well as a prototype for future research. The truss features a series of voronoi boulders which correspond to a given point set. By scaling the boulders from these points after they have been generated, the close packing of cells is opened up to create a node/spoke configuration. The vTruss is half surface, half truss. Fabricated at the NYU Advanced Media Studio using laser cut masonite, assembly information (orientation, connectivity, labels) was cut into the material itself. The truss is assembled without tools - a series of coordinated slots and tabs creates an interlocking frame that is held in place with simple dowels, even allowing for easy disassembly. As architects, we are trying to bring together issues of design, aesthetics, use, fabrication and assembly into functional models.

Mark Collins & Toru Hasegawa, Adjunct Professors, NYU Tisch ITP. Directors, Proxy
http://www.proxyarch.com

IMG_9548.jpg
The voronoi truss installed in the ITP loft.

AMS_blog_designProcess.tif
The voronoi geometry, scaled to create the voronoi truss.

AMS_blog_ColorCode.jpg
Exploded diagram of one voronoi boulder.

AMS_blog_sheets_closeUp.jpg
4 example sheets, with spokes, webs and plates.

AMS_blog_sheets.jpg
The packed cut files, showing the general distribution of piece types.

DSC00638.JPG
The laser cut Masonite, fresh from AMS.

DSC00643.JPG
Toru assembling the frames, which are pre-cut with slots that will later catch a series of spokes.

IMG_9636.jpg
Toru assembling the truss. No tools required!


Mark Collins & Toru Hasegawa, Adjunct Professors, NYU Tisch ITP. Directors, Proxy
http://www.proxyarch.com


0 comments

Laser Project Profile: Laser Cut Pendant Light

This is a pendant light laser cut from 1/4" Mahogany wood and 1/4" ivory acrylic. The assembly involves no cutting or gluing and the light is entirely put together from flat interlocking and snap-together pieces all cut on the Universal PLS6.60 laser. 

The Illustrator file used for cutting two sides of the lamp - each stack was cut twice for a total of four sides.


After cutting the wood each piece was then sanded, to remove the carbonized cut edge, and finished. The first part of the assembly involves fitting together the top and bottom wood sections as shown below.


These sections are then snapped into the four acrylic interlocking sides.


1/8" anchors, shown at the top of the illustrator file, are used to support the lamp socket to the top of the light. The lamp socket is attached to the anchors using the circular gasket in the top left corner of the file. The socket and bulb then twist into the assembly and are held in place by friction.


The lamp is then hung from its cord as shown. For comparison, the Maxwell rendering of the lamp used during the modeling process is shown below. 



0 comments

Creating an Acrylic Shelf with a Plastic Strip Heater

With a simple plastic strip heater it is possible to create professional shelves or other fixtures from acrylic material. In this instance, the material used was 1/4" thick clear acrylic, which is about the maximum thickness possible to bend with a low cost strip heater. The shape should be cut out along with any screw holes for mounting prior to the bending process. In preparation for the bend, unroll the strip heating element onto a flat, heat resistant surface and plug it in. It will take several minutes to warm up. Once hot, you may begin.


Step 1: Cover the heating strip with a layer of thin paper. This will keep the plastic from adhering to the strip and causing imperfections in the surface. The manufacturer of the plastic strip heater suggests placing the material underneath the heating strip, but we find that it is more effective if the material is placed on top of the strip, as it heats more effectively. With the heating strip covered with the thin paper, rest the material across the heating strip along the axis of the bend. It can be helpful to lightly mark this axis before beginnng. With this project, the bend axis was marked with a light vector etch. Once the material is resting on the heated strip, it will take anywhere from five to thirty minutes to become ready to bend, depending on the thickness of the material. 1/4" material will require the full thirty minute time period.


Step 2: After the appropriate amount of time has passed, the material will be flexible along the bending axis. You will need to use a dull, straight edged object to assist with the bend. In this case we used a wooden ruler, which was quite effective. Place the object along the bending axis and apply firm pressure downward. With your other hand, pull the top of the material up to the desired angle. If there is too much resistance, the material is not completely heated and will shatter or produce a poor bend. If there is much resistance, allow the material to re-heat for several more minutes.


Step 3: Hold the bend in place at the correct angle and remove from heat. Keep on a flat surface.


Step 4: Continue to apply pressure and hold the correct angle for thirty seconds to one minute, or until the bend has solidified and the material is rigid. Once cooled, the bend is complete, and the part is ready for use, or for additional bending.


0 comments

Video of Laser Cutting Acrylic

A video of the laser in vector mode; cutting through 1/2" acrylic.

0 comments

Investigation of Laser Etching Circuits Part III


Armed with new information gleaned from Mark Johnson of the printmaking studio at Steinhardt I began a new series of tests to determine the best combination of resist material, laser settings, and cleanup process for laser etching copper-clad boards to make circuits directly from digital plan files.

Printmakers use a process that is very similar to that required to etch circuit boards and involves a copper or zinc plate, ground (resist), and an acid etch solution. According to Mark, printmakers who have experimented with laser etching their print plates have settled on using heat-resistant enamel spray-paint to replace the traditional hand-worked ground on zinc and copper plates. 

The two spray-paints I purchased for testing are:
  • Majic - Rust Kill - Barbeque Black Spray Enamel - 8-2020
  • Krylon - High Heat & Radiator - Black - 1614

I sprayed two small 3" x 3" plates with a thin coating of each enamel and let them dry. I then ran each through the laser to test for settings and determined the same value for each plate as follows. I decided to use the higher resolution raster density value of 6 to improve clarity.

Lens Image Density Power Speed PPI
Raster Etch 2.0 6 3.8 10 1000

Each plate was then etched with a portion of a circuit plan file. Both plates looked very good after being etched but reacted very differently to being cleaned. 

The Majic plate was easily cleaned using only soapy water, but the finish was very delicate and in some areas was removed even with just a light touch to the surface. Cleaning with alcohol was too strong and dissolved the paint entirely. To be as delicate as possible I soaked the plate in soapy water and then lightly washed the surface using a q-tip. 


Here is the result of the cleaned Majic plate.


The Krylon plate however was not as easily cleaned. Below is the result after being washed with alcohol. A more through cleaning or a soaking in alcohol may help lift the fume from the surface of the plate.


And lastly the results after acid etching and removal of the resist using paint thinner. The Majics plate is clearly superior but still there are a few places on the plate where the fume was not entirely removed and the copper channels are crossed. Also, the very it was very hard to remove the material from the very small holes and the end of the channels and thus a few were left filled with copper.


0 comments

Laser Etching on Mirror

These are etching tests done on the backside of a glass mirror. Settings from top to bottom are as follows. 30,80,1000; 100,80,1000; 75,80,1000; 60,80,1000.

Chosen Settings:
Power Speed PPI
Raster Etch 75 80 1000




0 comments

Illustrator Laser Design Verification through Maya

Designing assemblies in a 2D program like Illustrator can be a difficult task, especially when the design involves many parts that fit together in a complex way. Below is outlined a procedure for verifying illustrator designs by putting together the components in Maya, a 3D application. 

The design file I'm verifying in this example is for a small fume hood for spray painting and has a total of 11 parts, 2 duplicates, as shown below.


To bring a part into Maya first make a new illustrator file and copy and paste the part into it. 'Expand Appearance' of parts to remove any pathfinder or rounding history nodes and save as an Illustrator 8 file. Then in Maya create an Illustrator Object of the file and set the thickness to extrude the curves.

ILLUSTRATOR
  • Object > Expand Apperance
  • Save As - Illustrator 8

MAYA
  • Create > Adobe Illustrator Object > [Box] (options)
    • Remove both start and end bevels
    • Set the extrude distance to the thickness of the material in cm.


Here is one of the sides of the fume box, set to a 1/4" thickness.


Here I am positioning the top to the side by aligning the groves at the edge of each panel.


The finished fume box with the front door removed.


A problem area with the file, here one of the panels can be seen to overlap with the side panel. This I'll go back in Illustrator and fix based on measurements taken in Maya.


0 comments

Rounded Corners in Illustrator

Illustrator's built in round corners filter will only round all corners of an object with the same degree of rounding applied to each corner. For the design shown below, I was looking to round only specific corners and to apply different amounts of rounding to different corners. A quick web search revealed a collection of scripts published by SATO Hiroyuki, one of which was called Round Any Corner, and will apply controllable rounding to only selected corners of an object.


0 comments

Investigation of Laser Etching Circuits Part II

Below are the results from submerging copper-clad boards with resist patterns in a ferric chloride acid bath.  I've chosen to etch only the acrylic and polyurethane portions of the board from the initial resist materials test plate (see part 1). 

This first plate is the polyurethane resist. The portion of the board that's etched is the portion that's been cleaned with alcohol after going through the laser. When the urethane is removed by laser etching it leaves a fume on the surface of the metal that cleans up with alcohol. Looking at the result of the acid etch however, reveals that the fume was not entirely removed around the channels and they seem to bleed out and in some places connect.


This second plate is the result of acid etching the acrylic resist. Once again the fume left by the laser when burning the acrylic blocks the acid from effecting the plate, but in the region that's been wiped with alcohol we're getting a clean etch without any bleed. There are a few areas on the board however where the acrylic fume didn't wipe away as easily and the edges aren't as sharp. More cleaning and perhaps other solvents may improve the fume cleaning step.



0 comments

Investigation of Laser Etching Circuits Part I

With the purchase of our new Universal Laser PLS6 laser marking and etching system, I was hopeful that using the new higher power lens option we would be able to produce circuit boards directly from the laser. Using the HDPFO lens on the PLS6 we were able to mark metals directly for the first time. Unfortunately, initial investigations into cutting copper on copper-clad circuitry boards failed. 

Laser marking of metals relies on an immense buildup of energy in a very fine spot on the material turning the region into a plasma that will either mark the surface or vaporize and cut through the material. Because of copper's high conductivity, as compared with other metals such as stainless steel, the energy generated by the laser is dissipated too quickly and cannot form a plasma, and thus the lasers affects are blocked by the thin film of copper on a copper-clad circuitry board.

The traditional process for making circuits on copper-clad boards involves transferring or developing a resist onto the boards surface from a printed pattern. The board is then submerged in an acid solution that dissolves the copper film except in places where the resist pattern has been deposited. The resist is then removed and the copper pattern is left. An example of this process. 

Although my attempts to etch copper directly with the laser failed I thought we could improve the traditional acid etching process by using the laser to subtractively produce the etch resist patterns directly on the board. This would involve covering the entire surface of the board with a resist and then using the laser to remove the negative of the printed circuit pattern. Where the laser removed the resist the acid would also remove the copper. To test this process I coated a copper clad board with six different resist materials and tested the ability of the laser to remove each.

The materials, in the order shown: Polyurethane, Spray Acrylic, Latex Paint, Two-Part Epoxy, Cyanoacrylate, and Black Sharpie Pen. 



On each 2" x 3" area of resist I then printed the following pattern of As and Bs using the settings shown in the table below. Rows A and B are identical except that I would later remove excess material from the B row by rubbing the area with alcohol to remove the fume that is left on the surface of the copper after the resist had been vaporized. Settings are in (Power, Speed, Points Per Inch).

Column 1 Column 2 Column 3 Column 4 Column 5 "B" (25,50,1000) [alcohol] (50,50,1000) [alcohol] (100,50,1000) [alcohol] (10,50,1000) [alcohol] (100,10,1000) [alcohol] "A" (25,50,1000) (50,50,1000) (100,50,1000) (10,50,1000) (100,10,1000)




I then chose a setting of (20, 50, 1000) from the table of As and Bs to use as a test setting for etching a sample circuit pattern on each resist area. 


I then used alcohol on a half of each material to remove the fume from the printed circuit pattern.


The following two images show the most impressive results which were for alcohol washed spray acrylic and the alcohol washed polyurethane. I'll be following this post with the results of the etching process.



Continued in Part II

0 comments

Project Profile: Danny Rozin

This project was submitted by Danny Rozin on 11/06/07 under Job Order J00165. 

Danny Rozin built the 3D file used to generate the model shown below using the programming environment Processing. The file is composed of small planes angled on two axis based on the pixel values of two separate images. The resulting object casts shadows that form one image when light is projected horizontally across its surface and the second image when the light is projected vertically.






Photo Credit: Max Andrews

0 comments

Off-Focus Etching of Print Making Plates

Off-Focus etching of print plates allows for thick vector lines without having to resort to a much slower raster etch technique. By controlling the amount the lens is moved out of focus the laser can be used to make precise line thicknesses. These line widths would still be designated in illustrator by a 0.1 pt line but would use a non-standard color to designate the desired line width through off-focus etching. Below are preliminary results from the first round of testing this technique, more information to follow when the plate has been printed. Attached is the file shown in the pictures.

Download file "OffFocusTestPlate.ai"

I started by printing a set lines at different line widths using standard raster etch settings. These make a good comparison for looking at the line widths and depths produced by the off-focus technique.


The next step was to print blue vector etch lines and incrementally increase the focus distance between the lens and the material. Each time the lens is moved further away the line gets wider and occasionally the power must be increased to compensate for the spread of the beam. For each line I recorded the off focus amount, the line # as reference, and the power settings.


OFFSET LINE# SETTINGS
0.0 1 5/10/1000
+0.02 2 5/10/1000
+0.04 3 5/10/1000
+0.08 4 5/10/1000
+0.12 5 5/10/1000
+0.20 6 5/10/1000
+0.28 7 5/10/1000
+0.36 8 15/10/1000
+0.36 9 8/10/1000
+0.44 10 8/10/1000
+0.52 11 10/10/1000
+0.60 12 10/10/1000
+0.68 13 15/10/1000
+0.76 14 15/10/1000
+0.82 15 15/10/1000
+0.82 16 20/10/1000
+0.82 17 25/10/1000
+0.82 18 10/10/1000

0 comments

Alignment of Double Sided Etches

The following is a procedure for creating double sided etches that must align on each side of the material and applies to transparent surfaces such as Plexiglass.

  1. Move material box inside from edge and make sure its size is accurate. You'll want about 1/2" on all sides from the edge of the laser bed so the maximum size of material can only be 17" x 31". The final piece will be cut from this material and so should be larger than the final desired size.
  2. Place a blue vector etch registration marks as shown in each corner of the material box. Each registration mark must be aligned in the horizontal and vertical directions
  3. Place a vector cut box inside the material box, this will serve as your final material size, material outside the box will be discarded.
  4. Place your design inside the final cut box. In this sample our design is the letter R. 
  5. Now that the design has been finalized select the design layer and name it "Side A", this layer should include the material box, the registration marks, the cut box, and your design components.
  6. Create a new layer called "Side B". Select the entire contents of Side A and duplicate it inside of the layer Side B by option dragging the selection box in the layers palette to the Side B layer.
  7. With the entire Side B layer selected go to the menu Object, choose Transform > Reflect and set the options to Vertical. With the arrow keys and the transform palette move the selection around until the registration marks exactly match up with the marks from layer Side A. Notice that the design, material box, and cut box do not align, only the registration points need to be aligned. Remove the cut instructions from the Side A layer. Cutting before flipping over the material to align with Side B would defeat the purpose of the alignment registration marks. (Note: in the picture below the extra cut box from Side A has not yet been removed)
  8. Now that we've created a double sided file in the template, running the job in the laser is relatively easy. Start by running Side A, placing the material as shown by the Side A material box in the file. 
  9. Now flip the material over from left to right, not top to bottom, and place the material as close as possible to the placement specified by the material box in Side B.
  10. With the lid of the laser open, run only the registration marks from layer Side B. As the red diode travels the four corners readjust the position of the material until all four registration marks align with the path of the red diode. You may want to slow the speed of the red diode to get a better look as it passes over the registration marks from the backside.
  11. Once registration is complete, run the design from Side B. It should be exactly aligned the Side A design. Reserve running the cut box until all the design components have been printed.


Considerations: Obviously this process will only work on transparent materials, This shouldn't be an issue as I can't imagine a situation where you would need to align front to back on opaque material. When using acrylic etching on both sides requires removing the paper backing from both sides of the material. This can caused undesirable effects on the down side of the material. Cutting usually involves back-burn where hot fumes hit the surface of the material that is usually protected by the paper and results in discoloration of the surface. Cutting will also heat up the honeycomb bed of the laser that will melt portions of the underside surface of the acrylic.

0 comments

Laser Etching Glass

Using the new Universal Laser PL6.60 in conjunction with the High Power Density Focusing Optics (HDPFO), etching glass is now possible. Settings for glass have been entered into our database and standard settings are as follows below.

Raster Etch Vector Cut Vector Etch
Power 100 N/A 100
Speed 5 N/A 5
PPI 1000 N/A 1000

An example of a vector etch on glass @ (100,4,1000)

A raster etch @ (100,5,1000)

0 comments