http://www.3ders.org/articles/20130226-how-far-3d-printing-has-come-since-good-morning-america-1989.html I found this video amusing and sad at the same time....
8297
Graham Stabler
eexgs
Mar 1, 2013 2:08 pm
I am a big fan of 3D printing and RP etc (duh) but it gets to me how the media act like it is something so new. The low cost end is pretty new but it needn't...
8298
Randy
rwwink
Mar 1, 2013 3:14 pm
I'd like to ask some questions of the group even though I don't normally do anything but monitor this group. I have had and can get a Xenon light source that...
8299
Graham Stabler
eexgs
Mar 1, 2013 3:44 pm
Can you explain the light guide? Is it a bunch of fibres? Your idea is to fuse a powder? I assume with heat? That means you need IR content, fibres tend to...
8300
oswaldonfire
Mar 1, 2013 3:56 pm
If you're looking to transmit high amounts of IR in the tens or hundreds of Watts range for heating/fusing applications, normal Silica glass fiber won't do the...
8301
Randy
rwwink
Mar 1, 2013 4:26 pm
Yes. It's a bundle of glass fibers. Has to be glass as plastic won't take the heat. To continue, I've used this type of system to melt and reflow solder in ...
8302
Randy
rwwink
Mar 1, 2013 4:36 pm
I had used a system as I described in the late ’80’s-early ‘90’s to modify PCB’s by de-soldering and re-soldering the components with the light pipe....
8303
Graham Stabler
eexgs
Mar 1, 2013 4:40 pm
Looks like you have the expensive fibres! With a pinch of salt: If the light emanating from an area on the end of the fibre equal to the size of the spot you...
8304
luis h
luisguillermo98
Mar 1, 2013 7:26 pm
Is this is mito or fact?. has any one experience any damage of the dlp chip after removing filters, wheel?. According to some expert and articles I have read,...
8305
luis h
luisguillermo98
Mar 1, 2013 7:42 pm
Hi Kyle, I just saw your post from last year. Amazing job like everybody has mentioned here. I just finish my 3d slicer fully loaded with material support and...
8306
arthur2shedsj
Mar 2, 2013 1:29 am
I haven't heard of any Digital Micro Mirror Devices (DMD) dying from the removal. But I have seen some optics that have melted after the removal of the color...
8307
luis h
luisguillermo98
Mar 2, 2013 1:39 am
Arthur, I am referring to the story that dlp chip get damage by UV. This is the reaon TI sell their UV chip at different price.. IR is not a problem. It can be...
8308
torben.mogensen@...
torben.mogen...
Mar 2, 2013 5:01 am
Hi Arthur, I am working down that route and will soon be testing using a 90w UV led at 400 Nm. So you will soon know :) My aim is to speed up the print cycle...
8309
Ashton Picas
campeck944
Mar 2, 2013 5:27 am
A polymer micromesh that size could not be created by a 3d printer. At least not yet. (Anyone try a 4k projector yet?) It would also not withstand the heat at...
8310
Light77
s26570489
Mar 2, 2013 2:46 pm
This is the resin Kyle was referring to http://buy3dink.com/p/59/uv-resin (Mixed and sold in the US) Fernando formulated this to be extra thin for use in top...
8311
Fernando Muñiz
fernando.inbox
Mar 2, 2013 6:13 pm
Yes I recall working with Kyle on that project, enjoyed it a lot and also very inspiring and quite different set of requirements from the typical printer. I...
8312
luis h
luisguillermo98
Mar 2, 2013 7:28 pm
Torber, I am also looking to convert the projector to LEd using a 100watt. This bulb emit much much less energy than HP and almost 80000 lumens. I am not sure...
8313
luis h
luisguillermo98
Mar 2, 2013 7:30 pm
I have seen smaller object created by DLP. They hook a microscope to the projector and shows micro patterns on substrates.....
8314
arthur2shedsj
Mar 2, 2013 9:11 pm
A single 0.5W 405nm LED is already capable of <1 sec cure times for 0.1mm layers with the matching photopolymers. I haven't seen any DMD's die prematurely yet...
8315
torben.mogensen@...
torben.mogen...
Mar 2, 2013 9:24 pm
Hi Luis, I went for ledengin.com in US, but they are quite expensive. I would have gotten a Chinese one, but could not find one at the time. As far as I...
8316
torben.mogensen@...
torben.mogen...
Mar 2, 2013 9:27 pm
Hi Arthur, I dont really understand how 0.5W 400Nm can cure much - could you point me in the right direction....
8317
arthur2shedsj
Mar 3, 2013 1:54 pm
If the photopolymer used has an Ec of 10.0 mJ/cm² (critical exposure) does that help? I'm not sure what perspective you have or grasp of the concepts...
8318
Graham Stabler
eexgs
Mar 3, 2013 1:59 pm
But are you including the losses in the optics etc, if you put a 0.5W LED in a projector you are not getting anything like 0.5W at the resin. I've not seen any...
8319
torben.mogensen@...
torben.mogen...
Mar 3, 2013 5:25 pm
So what you need to factor in, in a DLP printer setup would be: - emitted energy by the LED reduced due to operating temperature - emitted energy not hitting...
8320
Graham Stabler
eexgs
Mar 3, 2013 5:29 pm
... Energy is spread not lost, the absorption in the air would be negligible. but I have not seen any 3D printers using small UV LEDs of any sort, there is...
8321
arthur2shedsj
Mar 3, 2013 6:27 pm
Let's say we start with 500mW/cm^2 @ 405nm into the DMD. Project 64 x 48mm with a VGA (640 x 480) DMD 64 x 48 = 3,072mm^2 or 30.7cm^2 500 / 30.7 = 16.3mw/cm^2 ...
8322
Graham Stabler
eexgs
Mar 3, 2013 6:30 pm
... I would suspect it would be much more like reduce by 90% than to 90% If your numbers are right then what are we all wasting our time with lamps for? Graham...
8323
arthur2shedsj
Mar 3, 2013 6:57 pm
I predict that the next problems for most will be: How to get 500mW/cm^2 or more 405nm into the DMD from an LED? Which projector to use? How do you modify or...
8324
Graham Stabler
eexgs
Mar 3, 2013 7:21 pm
In what context is the following statement meaningful? "A single 0.5W 405nm LED is already capable of <1 sec cure times for 0.1mm layers with the matching...
8325
torben.mogensen@...
torben.mogen...
Mar 3, 2013 9:43 pm
Easy now Arthur, I'm not trying to mock you - all right? Your statement "cure with 0.5W in > 1. sec", I wish it was true, would be a major thing, but I suspect...
