Because of the overwhelming responce on our Research and Development on the SNYGRO ,the main page got really big and cumbersome to work with. For future development we will devided the main page into four sub pages , Also this day(may 25 , 2011) Is probably the last day We will post to this page.The growth and interest in the snygro is so huge we were forced to start a dedicated website called:
As from now, may 25 , 2011 Our USA and Canadian branch will cunduct business under the name ChemShapes. Chemshapes is short for various chemical and 3d-shape projection forming in the rapid prototype industry.
Please make posts , blogs and comments to our new website . We will gradually seperate and transfer the info here to our new website. Its great to have you all on board and thank you very much for all your support and input so far.
Tj and Roberto
The 3 dimensional rapid prototype printer
This Page will be dedicated to a project that I have started in another forum 3DCADJEWELRY.COM in 2010 . It is an open source project, meaning anyone can partipate in the development to be benifisial for all.
So what is a rapid prototype light projection printer/grower and how does it work?
The purpose of it is to rapidly ( a few hours)fabricate/grow an exact replica of a 3 dimensional computer aided design drawing(CAD). It is normally a conceptual or working model for the industry. Scientists ,architects,dentist ,jewelelers etc. make very good use of it and for the first time this will now be available to the hobbiest,the D.I.Y’s and tinkerers . Any type of model can be build with it with no limitations to undercuts ,hollow structures or curvature. It builds a model in a 3 dimensional hard durable solid layered format in resin ,rubber or wax. (now other materials also became available). The model is build upside down with the base attached to the hatced blue platform.
The software interface (see link below) starts the process by slicing a 3d CAD drawing into thousands of horizontal sliced layers and generate a photo image for each cross section in a seqential order. For example if the model was a sphere ,the images would start as a small tiny round white dot on the bottom and grow sequentially bigger per layer until it gets to the center slice(the biggest) .Then it will get smaller again (per layer) as it goes to the top of the sphere. . The last sliced image wil be small again. Each image is used to seqentially build a one layered cross section at a time. Each layer is formed by hardening a layer of resin by the printer as decribed below:
Refer to the above illustration #1 : A Light curing resin (usually Ultra violet(UV) sensitive) is poured into a shallow square vat/container (shown in blue color).The bottom of the vat is made of clear glass (shown in grey color). A building platform (lshown in light blue hatched) is lowered into the liquid resin until it almost touches the bottom glass (hairline space). A projector projects the first image sliced (cross section #1) of the 3d CAD drawing in white light (or uv) through the glass onto the building platform surface for about 8 seconds. As the thin sandwiched layer of resin between between the glass and the building surface recieves the light, it cures to a plastic consistency(polymerize). This first layer is importand ,It forms the base of our model wich is now glued to the building platform surface. The printer stops projecting and let the computer know to move the platform up another hair thickness (0.01mm) .The printer calls for the next image and projects the next layered image.The process repeats itself over many thousands of times with a new image every time…….. Layer after layer the model is build up ( like a thick stack of paper) to form the solid model.
This process continous until the whole model (orange) is extruded from the resin vat.The model is build upside down, as it extrudes from the base first.
A highly detailed model (high resolution) of 2 inches high (50mm) usually consist of thousands of layers. Needless to say that the whole process is computer controlled and can take up many hours to build a small 2 inch model.
This project will be based on a digital light projector solidifying a photo sensitive wax/resin layer on a growthplate (as described above.). There are various comercial printers like this out there (see list below) , But what makes our printer stand out from the rest is the fact that it is MODULAR. Meaning ,in just one printer you can have much more versatility and choice in building platform size and height .
You overcome the limitations of one small fixed growth cubic volume. One thing to keep in mind is that as you enlarge the projected area you loose some resolution and the outline is not as crisp as a small area . The quality of the resolution will be relative to the size of your model.
The main reason for this aproach is versatility.Now one printer can cover a much wider field of interest in the industry, from the jewelers that makes a small 1″ rings to a sculptor that makes 18″ sculptures.
The following posts was transfered from 3DCADJEWELRY.COM:(The first few were just cut and pasted from there ,thats why it is in all kinds of text formats)
Posted Feb 21 2011
So here is what I have got so far ,gathered from my research:
The projector is no problem you can pic up 1080 XGA,high lumens and contrast now for less than a 1000 Us bucks.
the machine A piece of cake,10x easier than a mill guys. Imagin NO TRAMMING!!!!!
The problem I have now is formulating the wax and curetime.I am working with a few companies to solve that will post that info soon ,any help in regards to that would be great.The software I am really going to need help on.I want to base this one on USB protocol.
So there it is all in a nutshell and a lot of food for thought.
I am going to use this first post to post all the links in this thread so it is easier to come by.
Chemical suppliers and info/tutorial:
RADCURE ENERGY CURABLE RESINS From cytec these guys are great and helpfull. And dilutants TMPTA for ADDITOL and EBECRYLS…EBECRYL UV-curable resins and oligomers
UCECOAT waterborne UV-curable resins
ADDITOL photoinitiators and additives
RAYLOK UV-curable resins
UVEKOL Glass laminating system
IRGACURE SPECS from CIBA-http://www.rit.edu/~w-ue/courses/0305-676/reference/Imprint/Photoinitiators%20for%20UV%20curing.pdf Whatever light source you use must match up with the photoinitiator absorbance peaks. Irgacure 819 has peaks at 295 nm and 370 nm:
ADDITOL photoinitiators and additives
Extract the info for youself IMPORTANT!!! We take absolutely no responsibility for any outcome of these formulations and some might even be hazardous, so get the necessary literature before you concoct anything. Polymers are nasty,use nitrile gloves and goggles.
Recipe 1 This was used by Prof. Nicholas Fang (University of Illinois)
All 3 of these can all be purchased for about $130(US) on may 2011 at SIGMA-ALDRICH
1) 98 ml Poly(ethylene glycol) diacrylate CAS 26570-48-9 Sigma Aldrich # 437441
2) 2 grams of Phenylbis (2,4,6-trimethylbenzoyl)phosphine oxide (Irgacure 819) CAS 162881-26-7 Sigma Aldrich #511447
3) 0.02 grams of Sudan 1(one) (also known as …1-Phenylazo-2-naphthol…) CAS 842-07-9 Sigma Aldrich # 103624…thats it for recipe 1
FACTS ABOUT SUDAN 1……….Sudan is a artificial food color mostly banned in the food industry in the us , Both the artificial colors known as Yellow 5 (Tartrazine) and Yellow 6 (Sunset Yellow FCF) are azo compounds. Essentially they are sulfonated versions of Sudan 1, Yellow 6 are used in medicine etc. for its color.
Why is it used here?…It’s to block the UV to penetrate too deep into the resin.thats it.I’ll explain more in FABRICATION TECHNIQUES. Later.
Directions: also see this video https://www.nano-cemms.illinois.edu/…_printing_full
The solution requires several days to dissolve – make at least 3 days before use, longer is better.
Solution should be stored in an amber bottle.
Solution will store for at least a year with no degradation.
Several people have asked what lens we use. We use a Plano-Convex Lens 50.0mm Dia. x 150.0mm focal length, MgF2 Coating that we get from Edmund Optics, NT32-975. This is just the lens, if you want a holder as well; we use their holder M54-986 with a mounting post M54-940.
Recipe 2 Wax For the jewelry industry
This is the one that TJ is formulating for wax and rubber, and still working on.I am gonna use “ADDITOL TPO” ( A fine powder), from CYTEC. http://www.cytec.com/specialty-chemi…flyer_apcs.pdf Because I am not going to resin polymerize with the HDDA .I have to use a wax in a carrier monomer type liquid to form the chain bonds. known as
TRPGDA (Tripropylene glycol diacrylate) from SHAMROCK TECHNOLOGIES inc. in their “everglide range of products” UV-691 , UV-636 , UV-600D , UV-395D http://www.shamrocktechnologies.com/…s_coatings.pdf Also can use TRPGDA, DPGDA, or PEG(400-1600)DA or Ebercryl 3211. Irgacure 819 is a pretty good choice. And for solubility problems with the photoinitiators, try TPO-L (Ethyl – 2,4,6 – Trimethylbenzoylphenylphosphinate which is a yellow liquid TPO). You should just be able to stir it in. and the light source you use must match up with the photoinitiator absorbance peak spectrum wavelength. From what I could gather is that the photoinitiator that gets activated closer to the visible light spectrum 400nm is more expensive,(I might be wrong ,but the prices sure proof me right)
Materials (Aluminum ,UV Plastic sheets, fasteners etc. )supliers:
Misc/v-groove bearings/guides etc/worms
v-groove bearings and other linear guides BEST PRICES!! Up to ABEC 7’s
Stepper drivers: http://www.pololu.com/catalog/category/11
USB > HDMI 1920 X 1080 Adapter http://www.dealextreme.com/p/usb-2-0-audio-multi-display-adapter-with-dvi-hdmi-vga-audio-1920-1080-max-54060– This link is probably short lived.!
We are currently developing our own software interface I will post
the link here soon. It will ,like everything else be opensourced for all to take part.
Similar Comercial printers out there:
Related misc. Links
a Post I did on Feb 17 2011 about the aberation assues:
In optics, a collimator is an optical device that generates a parallel beam of light and may consist of a curved mirror or lens with some type of light source and/or an image at its focus. This can be used to replicate a target at infinity without parallax. Optical collimators can be used to calibrate other optical devices, to check if all elements are aligned on the optical axis, to set elements at proper focus, or to align two or more devices such as binoculars and gun barrels/gunsights. A surveying camera may be collimated by setting its fiduciary markers so that they define the principal point, as in photogrammetry
Posted on Feb 18 2011
THE CHEMICAL COMPOSITION on the resin (the secret no one wants you to know)
I’ve been on the Phone all week to gather chemical info from these chemist’s,Most of them are way too smart ,and the very essence of their whole being sits in all in their brain,Most of them have no people skill and comunication skills at all.Nonetheless Two companies was very helpfull. CYTEC and SHAMROCK TECHNOLOGIES inc..So keep them in mind when you buy chemicals. The link that I have posted I found a way back is based on a resin composition I am no chemichal buff at all but this is what I could gather so far on the composition.
UV / visible light (400 nm right at the edge between UV and visible) from the projector produce light to
initiate a photochemical reaction by cleaving a molecule to form free radicals
Wiki on radicals
Radicals (often referred to as free radicals) are atoms, molecules, or ions with unpaired electrons on an open shell configuration. Free radicals may have positive, negative or zero charge. Even though they have unpaired electrons, by convention, metals and their ions or complexes with unpaired electrons are not radicals.  With some exceptions, the unpaired electrons cause radicals to be highly chemically reactive. Radicals, if allowed to run free in the body, are believed to be involved in degenerative diseases and cancers.
Free radicals play an important role in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes. In chemical biology, superoxide and nitric oxide regulate many processes, such as controlling vascular tone. Such radicals can even be messengers in a phenomenon dubbed redox signaling. A radical may be trapped within a solvent cage or be otherwise bound.
What they used for the resin:?
The free radicals will polymerize a monomer through an addition
polymerization reaction. It will polymerize the solution, becoming solid, only where the white light is
projected. It will remain an unreacted liquid elsewhere.
The photosensitive monomer (1,6 – Hexanediol Diacrylate or HDDA)
works under the process of addition polymerization. The photoinitator
(Irgacure 819) absorbs UV-wavelength photons and produces free
radicals. These free radicals react with the monomers (HDDA) to
cause chain propagation, polymerizing the monomer. This chain
propagation terminates when two chains react with each other.
Successive layers are made by lowering the polymerized shape into a
beaker of the solution. A thin layer of fresh solution flows over the top
and light is again projected to solidify portions of the fresh layer. This is
repeated, creating a 3 dimensional object layer by layer.
Here is may take from what I could gather from this week of research.
And any help in regards to this would be geatly apreciated.
trimethylbenzoyl diphenyl phosphinoxide)
THE PHOTO INITIATOR
They used “Irgacure 819” to produce the free radicals (wich would probably work just as good for a Photoinitiator), On reccomendation I am gonna use “ADDITOL TPO” ( A solid,
Now here is where the wax comes in:
Because I am not going to resin polymerize like they did with the HDDA .I have to use a wax in a carrier monomer type liquid to form the chain bonds. known as
TRPGDA (Tripropylene glycol diacrylate) from SHAMROCK TECHNOLOGIES inc. in their “everglide range of products” UV-691 , UV-636 , UV-600D , UV-395D http://www.shamrocktechnologies.com/…s_coatings.pdf So this is where I stand now ,waiting for the chemicals to come and I am very anxious to mix. I migtht be way off, but at least it is a place to start, more to come soon. TJ.
Yes the resin does burn out but the guys told me it still leaves a residue that needs to blown out.,you need a escape vent to blow the residue out. As far as mach3:
I was thinking along that lines too,to use mach3 in 2 axis mode ,But the trouble I am having is to get it syncronised with the image display.
I find a lot of software that output PARRALEL and g-code and other programs that generate images in slices,But have nothing thus do far that does both.
The closest one is at the above post http://replicat.org/usage
But it puts out toolpaths,I think I should download it this weekend and play with it maybe there is image output too.
Post on This next find and post was probably a big brakethrough for me and is based on this link
One thing that is very ,very interesting to me is this:
When you look at those build videos again(the last one),they build that right side up so that the little block has 4 top beams accross with no support ???
At some point they exposed a slice to from the bottom of the beam.???? .(How far did the light penetrate??)..Huh…That is the reason most printers grow upside down….to stop the light penetration at some point.
Did any af you caught that??
I tried that freesteel /slice last for a long time but could not get it working. Looks like a good solution.
21 Feb. 2011
I just counted the x-resultion on the xy plane on some hight def waxes/resin and it came to :
100 dots per 3.77mm
Thus 673 dots per inch(25,4mm)(Wich was surprizing low to me.)
thus I my non-profesional opinion a 1900 x 1080 prjector should give a 1.6 x 2.8 inch display/grow area footprint .(with no corection or cullumation)
So this will be a startoff point to play with and plan on.
I can try and double the resolution by going half that areain the x-y plane.
I still have one variable, the Z- axis,Luckily its the variable thats the easiest to adjust so I will just have to see.
Feb 22 2011
I read this pdf https://www.nano-cemms.illinois.edu/…docs/guide.pdf
very caryfully this time and answered my own question.
shown in red the answer was “Sudan I” At least 24 hours before the experiment begins, mix up the solution. Combine 98mL of 1,6 – Hexanediol Diacrylate with 2.00 grams of Irgacure 819.In order to reduce bleed through (since you are projecting light through a photosensitive material and only want to create thin layers), you must add Sudan I, a UV absorber.
For this lab, the concentration of Sudan I is low because the layers are much more than 0.4 micron thick layers used by Dr. Fang. Using an analytical balance, measure 0.0054 grams of Sudan I. Combine the Sudan I with the other two components and mix thoroughly. This solution takes approximately 24 hours to become fully homogenous. Also this:Slide 23 (Overhanging Structures?):
The thickness of each layer is controlled by the addition of a UV light absorber. Sudan I is one such compound that works well. The more Sudan I added, the thinner the layer.
If no UV absorber is added, the layers will be quite thick and overhanging structures will not be possible.
Posted FEB 282011
Been very, very busy on the snygro drawings this weekend.
attached it is!.you guys can disect it if you want.
It needs lotsa refinement still. But the main idea is there.
Haydon Kerk 23 nema stepper about @150 bucks with attached leadscrew and anti Backlash nut.(100mm Z Travel)
The projector is just plopped on the bottom,I don’t know the sizes of it yet, it is still on order..After I hack it I will know more about the bottom dimensions and workings of the projector.(The whole main post wil probably be shorten about 200mm I hope
The whole machine is modular.all aluminum and steel with a plastic uv cover.
The z axis slide up on 4 v-groove bearings.The building platform on a extrusion bolted to the vertical slide Z-plate.
The vat swivel on two grub cone pivots
and gets tilted with a cam lever and solenoid.Thats to break it loose from the vat floor after every cured slice.(They all say i need it I am not sure yet,but I did allow space for it.)
All the electronics will be built into the main collumn,usb interface.power supply etc.
That is pretty much all there is to it.
All in all, my guess that it would be about $500-$ 800 in
materials.(without the projector) That all depends on how much the machining is gonna be.
So hack at it and have fun…
Then I ran into Junior Veloso’s site http://www.blogger.com/profile/05512076772313885730
Last Year I did not pay much attention to his site Because he was just at infant stage and experimenting still .
Land last last week I surfed his site again and was amazed at the progress he made in the last months I was totally impressed and please check out his site. He also has an awesome video here:
There are also some software downloadable here:
But I had no luck yet with the downloads yet,it is super slow.
Posted April 06 2011
The construction of the collumn is so simple it’s is gonna take more work to convert any other machine than to make a new one.You can use one linear axis though.
Remember there is one major problem that we bypass with a vertical grow machine and that is HYSTERESIS/ repeatability or Backlash.
(HYSTERESIS a deficiency of returing back to its origin or coordinates.)
Once a grower starts it just keeps on trekking and does not care where its been because it never have to return.There is just TWO things to worry about,and that is:
1-to move the same vertical distance every time
2- No to rotate around the collumn (movement left to right) ,wich is much easier to controll that backlash on a mill.
Recieved my VIEWSONIC PRO 8200 (1900 x 1080) ($ 926 US) Last week but had to send it back again because it was defective,I was so disappointed.
Hope to get another one in this week.In the meantime I am getting ready to start experimenting on the wax formula.
Another idea I am working on is a continious grower with no slice file.
Almost like an analogue idea compared to digital.This will eliminate the slice lines in the models and interpolating/Anti-alias (blending the boundary) of the vertical pixels just like it does with the horisontal layered pixels.
April 8 2011
After 2 tries,(The first one was defective) my digital light projector just arrived today.
This is the description on the manual:
“Viewsonic PRO8200 DLP HD Projector
The ViewSonic® Pro8200 DLP HD Projector delivers a true HD home theater entertainment experience to even the most discriminating home theater enthusiast. The Pro8200 native 16:9 widescreen aspect ratio is ideal for HDTV and movies as well as gaming. The Pro8200 combines state-of-the art DLP® and BrilliantColor™ TECHNOLOGIES with 2,000 lumens and 3000:1 contrast ratio (typ) to deliver a stunning visual experience to any home theater. The innovative seven segment color wheel provides vivid, rich colors. With multiple connectivity, including dual HDMI inputs with HDCP, lets the Pro8200 connect any DVD player, game console and more for complete home entertainment. Get ready for beautifully clear home theater entertainment with the Viewsonic PRO8200 DLP HD Projector.”
I bought this one at Buy.com for $926.00 US.
This weekend there wil be a lot of playing going on.
My aim is to hack it and replace the White light bulb unit with the right wave spectrum uv light source and a visible red llight just to see where it is projecting.
There is no need for the wavelenth spectrum 450nm to 650nm (blue,green and yellow) .It just generates unnecessary heat. I dont even know I need the color wheel , I might just rip that out too
April 27 2011
Well there was quite a bit of action going on with the Snygro the last few weeks:
1- The most important and exciting is, I teamed up with a great in partner in Canada, He is extremely well educated in the 3d world of graphics. An excellent software programmer and have very good grasp and understanding for the technical side too. He has done similar technical projects with great succes and precision. This is a very exciting move for the development of the the printer. The Canadian branch will be mainly focusing on the Software /interface development and the US branch mainly on the hardware development. Both branches will integrate and combine decades of experience and knowledge (Both in software and hardware) to bring forth one of the best and most affordable Rapid prototype modular units ever build.
Research and development have and will always be the driving force for the new formed company and will keep us on the cutting edge of technology. It will be a very advantageous step for future development. A New company and name will be established and will be posted soon.That is about the only info I can give right now.
2-Like I said the printer also got revised.
The old main collumns (2 of them) has been replaced by a one square collumn system.The stepper motor moved up to the top to eliminate resin spillage on the motor.
I haved also ordered smaller V-groove bearings for the Z-baseplate.And decided to build two prototype units one for Canada and one for the US Branch.
May 3 ,2011
Finshed the steppers ,coupling , leadscrews and the anti-backlash nuts I turned fron carbon impregnated nylon as seen in the picture
Here is a schematic of the solenoid tilt mechanism. I have to slow-down to the solenoid so I dont get pull and release and spill the resin out of the vat. I think I will add a micro pneumatic air release hole in the center cylinder for that.
Got the new rails and v-groove bearings in today. The collumn are almost build.
Totay I got the li’l polulu stepper drivers in .How nice.
Hope they work cause I am tired of building driver boards from scratch . You cant beat the price…$20 us.
I also got in the Arduino USB , mega 2560 Multi I/O Board, just as nicely made . And again you cant beat the price on E-bay. At this point it is way overkill for this printer but I figured I can add some extra features in later to make it more user friendly.
So I am gonna play with these tonight and keep you posted.
Here is a simplified electrical schematic for now.
May 4 2011
OK ,Last night I hacked the Viewsonic pro 8200,.
Because the main lens is gonna project upwards now , I thought it would be easier to turn the main motherboard back to horizontal to have easier access to the VGA socket and keypad on the main printer enclosure case. ,and that I might also save on the vertical height of the main enclosure case. So I was gonna re-arrange the whole configuration of all the pc boards ,keypads and sockets in the new case.
So after about 4 hours of headscratching I came to the conclusion that I would gain absolutely nothing by doing that. In the following pictures you would see why.
Here is the reasons why:.
1-The whole unit is so compact in design that it would only take up a lot more space after I changed the motherboard and keypad direction.
2-The main motherboard is attached with (2x) 80 pin (0.25 pitch) board to board male and female connectors. 2x Extension ribbons need to be made.(no big deal but still a pain,especially at .25mm traces)
3-Here is the main reason. The best place for the main board is about right where it is now but should be turned sideways. So by turning it sideways I only would have gained 25mm in height….NOT WORTH IT!!
4-The main 2x power supply units(AC and DC) and the keypad (in the cover now) is easy to move,small and can really go anywhere.But they are not the ones that really need to be re-configured anyway.I can live with a keypad on the side.
5- By keeping it all intack you can still retain your warranty.
6-Just a arm as an attachement bracket will make the kit more versatile and modular to take newer and less expensive DLP’s.(or any kind for that matter.)
Thats why I came to the conclusion ,lets keep it all like it is in its original case, and make a projector bracket with a protective window over the lens for resin spills.It will save us a ton of headaches and much less work. We just have too keep a close eye on the temperature .We might need an extra fan (or stronger) by going vertical.The only thing we will replace is the lamp with UV led array for the right wavelength spectrum.(we dont need all that wasted heat generated from the current Osram lamp) .We will probably use the same Osram lamp enclosure for the Led’s too.The other thing is ,we might do some lens correction or replacement,but hope not to.
Thats it for this weekend folks ,I also played with the Arduino mega 2560 micro controller this weekend .I am slowly getting the hang of it too. I was amazed by the ease of programming such a cool li’l microcontroller ,It is good way of cutting my teeth on C++ and C……I think it is going to work great with this printer and projector.. Thanks to Roberto!!!! Great choice!…so is the polulu’s…..
Here is the link for Munz’s invention
The VGA display output discussion came up and we will definitEly try VGA , but the cool gadget man Roberto found this USB > Hdmi adapter. Good find again ! and for only $55 (us) free shipping from Dealextreme.com .That will hopefully wil give us a full digital 1920 x 1080 resolution wich is also the native of the Viewsonic Pro 8200. I’ll keep you posted on the outcome of that. I think it’s gonna work fantastic!
May 17, 2011
Ok last we left of here:
So this weekend more progress ,This was harder than I thought,Took a really long time to figure out the vat removal ,Pivots and tilt mechanism,..Still in the rough now,but I wil finish off nice when I know all is working good.
Our software is all being done in python script language.
We’re are working really hard for the D.I.Y printer community! . And we are really excited to finally produce a MUCH ANTICIPATED 100% OPEN SOURCE high-Resolution 3D printer to the community!
We can GUARANTEE, with a 100% certainty that this project will keep going open source from beginning to ever! All our files will be hosted as a google-code project any day now, which essentially guarantees that they will stay online, open source to everyone no matter what! (after its being published, we can’t remove anything from google code!)
We strongly believe in open source as a way of life, and money earnings on this project is more a consequence for us than an actual goal!!!! . Remember our main GOAL and MOTTO for this project !, “Make this printer 100% available to everyone !!. In doing so, we are working really to bring this project to a reality.!!
May 19. 2011
Got the 24 VDC 4.5 A , switching power supplies in today from China (E-Bay…stoneined2009 ) , they look great and will work very good…http://stores.ebay.com/stoneined2009?_trksid=p4340.l2563
Stay tuned a lot more coming every day!!! …TJ.
May 20, 2011
A Really Nice Resource about UV cure
(by Hradec – may 19th)
http://www.uvabcs.com/uvlight.phpLots of information there to learn a bit more about UV curing materials, techniques and more…Also, find this really nice supplier of UV adhesives in Canada (yeah… I’m in Canada), which is really hard to find: http://www.ellsworthadhesives.ca/
They have a really nice search system, were you can refine the list by selecting different aspects of the material, like viscosity, cure time, etc. Unfortunately, theres no prices whatsoever… everything has to be quoted! =(
A little bit about UV Curable resins…
(by Hradec – may 19th)
Nothing new here… an adhesive from Dymax that cures fast on UV and blue light… but what catch my eye was the second page… the 2 graphs showing the depth of cure relation with time of exposition and light intensity… And then I realize:
|Some typical viscosities (cP at 20°C)|
|air||0.02||motor oil SAE 20||125|
|acetone||0.3||motor oil SAE 50||540|
|linseed oil (raw)||28||treacle||20,000|
|corn oil||72||peanut butter||250,000|
|olive oil||84||window putty||100,000,000|
Latest version of the host software, running on windows and moving the axis stepper in “live” mode.
(by Hradec – May 20th – 4:20am)
http://www.youtube.com/watch?v=5yQbOFnh4coI made this video to show everyone the development evolution. The host software now detects the available serial port devices, list it on the combo box. Select the right one and hit “connect”. It connects successfully to the Sprinter firmware running on the arduino.
From there, the host software just need to send GCode over the serial device and that’s it! Now I’ll work on the homing procedure, the refill procedure and next, I’ll “glue” skeinforge into it to slice an object. The print procedure is also done, but in a separate script. I’ll try to “copy and paste” in the host software so I can record a small preview of a “print” simulation! **************************************************************************************
May 25 ,2011
The opto and limit switches is done and almost installed.It always surprizes me how long it takes to design the simple things in life,its easy to design complicated stuff, but simplicity takes some headscratching.And so it was with the opto switches. When you look at it you would never think it took days of headscratching to make it simple.