Hi goaran, ich frag mal nach ABS - keine Ahnung, ob die auch PLA verarbeiten. Ich habe das LDPE-Pulver bekommen, da es 'leichter zu schmelzen' wäre ... als Granulat haben sie es auch da ...by VDX - Altes Forum
... Atztek in the German forum tried this - go through the atached images and links ...by VDX - Powder Printing and Selective Laser Sintering
... ich habe mir heute Vormittag von einer örtlichen Kunststoff-Verarbeitungsfirma, die Granulat herstellt, kostenlos ein Säckchen LDPE-Pulver und Pigmentpulver in Schwarz, Rotbraun und Ultramarinblau geben lassen ... die habe auch Granulate in allen möglichen anderen Kunststoffen und Farben da. Falls Interesse, kann ich da mal wegen Konditionen und Liefermengen anfragen ... Testmuster bekomme iby VDX - Altes Forum
... i've tried with a PMMA-glue called "Acrifix192" - with a steppermotor driven dispenser and UV-LED's for precuring you can print similar to the reprap-head and it cures to a completely transparent solid PMMA-body ...by VDX - Let's design something! (I've got an idea ...)
Hello Hasmukh Prajapati, ... i bought the AuSn8020 from a goldsmith-shop (didn't remember name and adress ), it was intented to fuse gold together at lowtemp - first melting-temp was below 400°C, second time you have to heat above 700°C to melt it again. The spheres were relative uniform with diameters around 30 microns. For better handling i mixed them with gold-dust - the dust particles wereby VDX - Controllers
... yes, FESTO made something similar with a hydraulic system and some ten thousands Newtons For longer lasting you should use a stronger balloon (maybe from a basket-ball), a inner shell and a lubricant between the balloon and the shell, so the resin won't be chafed ...by VDX - General
... when removing the nets from winter-bird-feeding-dumplings(?) i remembered our discussions about pneumatic muscles and tested one of the bigger nets with a inserted ballon I burden the net with the empty balloon with 10kg and measured 200mm elongation ... then inflated the balloon and measured a contraction of 40mm against 100Newton. I could have raised the burden to 25kg/250Newton, but myby VDX - General
... i have some piezoleg-motors which are powered with 12 Volts, have a traveling range of 25mm and a step-resolution of 150 nanometer stepping and could be optimized (possibly but complicated/expensive) for 'bending' between the steps so they can resolve sub-nanometers. In past i built some cartesian 3-axis-systems for microassembly, but this can be repeated for nano-/microfabbing tooby VDX - General
... you have to check what's cheaper, easier to handle and more accurate: - a DLP-projector with enough power for sintering the material, or a laser with a scanning head. Actually 2D-galvo-scanners can be bought at ebay for some ten to some hundred Euros (depending of speed and accuracy) and lasers with powers above 30Watts can be obtained for some hundred Euros too. To achieve the same accuracby VDX - General
... read the thread about "Reprappable linear drives" - especially the atached images in the 1th and 15th posts ... Some years ago i found a linear XY-table with a cross-hatch-milled iron-table of nearly 1x1m size and two planar linear motors similar to the image in the 1st post arranged in a moving head ... and two sensors scavanged out from optical mices for positional feedback ...by VDX - Mechanics
Hi Kurt, ... comercial systems blow a stream of inert gas in the spot of a strong laser (NdYAG or CO2, some 100Watts) and add metal powder to the stream, so the powder is transported and shielded by the gas. With special shaped nozzles they manage to feed the powder through the spot, so it melts and the droplets hit the surface and fuse together ...by VDX - Powder Printing and Selective Laser Sintering
... yes, found this too - in the preview it was in correct alignment, posted it was a messby VDX - General
Hi Markus, ... i was interested in the properties of POM, as it's much cheaper and i have it at hand - so i updated your list: PTFE PEEK PEEK mod. PEEK 30%GF ABS POM-C POM-H Coefficient of friction 0.05 0.30 0.11 ? 0.5 0.25-0.32 0.25-0.32 aggainst Steel yield Stress N/mm*mm 10 100 120 156by VDX - General
... ich habe ihm schon in seinem ersten Post empfohlen, die Figur in Beine und Oberkörper zu trennen - dann geht alles ohne größere Überhänge. Und für die Unebenen Unterseiten könnte er die 'Spinnennetz'-Option als Support nutzen - das hat jemand für seine Figuren gemacht, indem er unter den überhängenden Bereichen lauter dünne Säulen mit noch dünneren Kontakststellen fabriziert hat ... Eventuby VDX - Schwarzes Brett
... the water disperses nearly immediately in the powder and evaporates quickly if heated, so it's not enough for sintering-inhibition ... the salt crystalizes out, so a thin coating of nano-salt-crystals separates the wetted particles, even if they melt under the IR-heater ... An LCD-mask is only usefull if the LCD isn't affected by the heat from the IR-source and don't block the radiation on tby VDX - General
Hi Alex, ... check the german forum, especially "Hi German RepRappers, where are you located?" - i know there are some reprappers in Berlin too ... *** EDIT: checked the posts and noticed that the German forums had mainly suffered from the "Umlaut"-bug ... many posts are truncated after the first occurance of a special sign ... and nobody managed to repair the truncation So maybe ask your queby VDX - General
Hi Alex, ... if you can assemble the model from two parts (legs and upper body) then tis wouldn't be a problem. Bigger 'overhangs' are a bit tricky but some guys solved this too with supporting cobweb-structures ...by VDX - General
... there were some related discussions, don't know where ... you need only 5 axes, as you can replace any 6th by rotating one of the others ... snd yes, a 5-axis-RepRap would be a big advantage, but the software is a really big venture tooby VDX - General New Machines Topics
Hi Sebastien, > VDX mentioned that he had done some work on a > related subject, and might be up to putting it in > the wiki. ... i'm really busy now, but here is a related discussion and atached images with some of my then developed and used tools ... mabe helpfull?by VDX - General
... i think the idea behind RepRap was to create a system capable of building most (if not all) of its own parts with an affordable cost, so anyone interested in the technique could participate. The idea is not unique (most CNC-routers can do the same), but it was based around FDM with DIY-plastic (PLA) for reducing the basic costs and an ecologic meaning ... but you need some 'vitamines' as eleby VDX - General
... by the way - if you already have a cutting/sintering laser, you can combine the mask-sintering method by applying an IR-heater and cutting the masks with the laser. But there are some really hard to realize preconditions: - for the masks you need a material which you can cut with the laser, that withstand the heat from the IR-source and is cheap enough for highcount masks per part. For plasby VDX - General
... inkjet printimg and areal sintering is much faster than fabbing with FDM or laserspot, but you are limited by possible materials and final stability. Masks are made from heatresistant and/or reflective material and you have to cut every changing layer or combine single elements as in oldstyle Gerber photoplotters. With laser you have much higher temperatures, so you can melt/fuse any materiby VDX - General
... not water, it's called "Inhibition Sintering" and you print with a salt-water mixture - the water evaporates, the salt remains and "inhibits" the melting/sintering of the 'contaminated' area. When heating the surface with an IR-heater, the clean powder melts and the salt crystals prevent the fusing in the printed lines ...by VDX - General
... beside SLS there is another sintering technique called "Selective Mask-Sintering" - here you rise your powder-bed as with SLS but then you place an optical mask on the powder-surface and activate an areal IR-heater above the mask, so only the powder not covered by the mask melts. I would atach the PDF-file, but it's 3MB, so i cant upload ... here the (maybe temporary) link to the (German) PDby VDX - General
... the most promising omnipotent technology is laser-sintering - here you haven't mechanical forces, so your mechanics can be lightweight, but have to be really accurate. And you can make any shape from every material you can melt/sinter with the laser. The only problem is the fabrication of the laser source, here only CO2-tubes with extrenal mirrors and a high-volt PS are in the DIY-range, alby VDX - General
Nyarlathotep Wrote: ------------------------------------------------------- > > Slightly off topic has anyone discussed the > > fundamental stumbling block of extruding a part > > that will stand the temperature of extruding > the > > same material. How are we ever going to make an > > extrusion nozzle?! > > > Well, single-material isn't a design goal.by VDX - General
Hi Adrian, its really interesting stuff and give some ideas for meso-/macro-scale-fabbing with 'vanishing' materials I know similar 'macro'-systems with a soldering bit vanishing styrofoam - my father made his mountains for a model-train with this methode. I remember a post in the forum where someone modelled wax-blocks with a heated needle sucking the molten wax away ...by VDX - General
... the main difference are the fumes - some plastics are extreme toxic and carcinogenic when burned away ... remember Seweso/Dioxinby VDX - General
Hi Bob, rhmorrison Wrote: ------------------------------------------------------- > > Even the badest ones, ... > > > Is that proper English English because it's > certainly not proper American English! ... this is more like "German English" - sometimes i have similar issuesby VDX - General
... or adopt this behaviour as "RepSpam"by VDX - Russia RepRap User Group