... with my experiments on powders and pastes i noticed that spherical particles are much better suitable for both, powder-printing or paste-fabbing. The simplest way to make micro-spheres is to melt the material to a low viscouse fluid and shot a beam of fluid on a fast rotating disc ... the fluid material is shot away and is reforming in small droplets which can solidify before hitting the walby VDX - Powder Printing and Selective Laser Sintering
... a laminating-cutting-head is simply a roll pressing a selfadhesive sheet an the cylinder and shortly after a scanning laser-line will burn dots through the sheet representing the cutting lines. For metallic or ceramic sheets you'll coat or spray the underside with something for soldering/fusing with the surface - either solder for metall or ceramic slip (or waterglass) for ceramics. ... herby VDX - General
... i had the idea some ten years ago, when i realized, that conventional LOM-fabbing was way to slow My idea for a speedup was first the elimination of the pauses between the slices ... and second the possibility to apply more identical setups circular around the cylinder, so you can process slices per revolution synchronous, where is the count of laminating/cutting heads around the fabbingby VDX - General
Hi Wolfgang, ... das heißt, du taktest momentan mit 1.2kHz maximaler Steprate und einer Schrittauflösung von 3.75 Mikrometern ... Mit Umstieg auf Mikroschritt-Treiber könntest du bei 1/8-Mikroschritt mit etwa 10kHz takten, hättest bei sonst gleicher Mechanik dann rein rechnerischn knapp einen Mikrometer Auflösung pro Schritt und eine maximale Geschwindigkeit von 9.375mm/s, also knapp mehr als dby VDX - Offtopic
... i have plans for developing a "lathe-LOM" some days (or maybe faster) with some help: - here i roll/glue an endless stripe on a cylinder, so the laminating and linewise cutting with a laser-scanner can run as continuous process until you'll reach the topmost layer ... But here i need software that can calculate all cutting dots per line for the actual angular position of the cylinder and theby VDX - General
Hi Wolfgang, ... das hängt eventuell noch von den Motoren und den Endstufen ab Meine Steuerung hat max 10kHz Taktrate (bei >1/4 Microstepping, sonst nur mit optimalen Beschleunigungsrampen bis 6kHz bei Halbschritt), was bei 5mm Steigung pro Umdrehung und 1/4 Microstepping 62.5mm/s oder 3.75m/min wären ... so schnell wage ich nicht zu fräsen Bei 1mm Steigung wäre das alles durch 5, also 12by VDX - Offtopic
... is there the option to flag the sub-forums for new posts?by VDX - Administration, Announcements, Policy
Hi Dman, ... the only difference between inner and outer voulume is that outer volume-areas are criss-crossed by lines a laser or cutting bit will draw. For this i simply inverted the 3D-object, so Skeinforge handles the outer volume as if it's the area to do infill-paths. For adding the laminating procedure you'll have to pause after every completed sheet, start the laminator (or do it manuallby VDX - General
... i made the complete G-code for all slices with Skeinforge. For LOM-fabbing i have to implement the laminating-procedure ... best triggered sheetwise when increasing the Z-position ...by VDX - General
Hi Bob, ... das ist von Rechner zu Rechner und je nach aktuellem Zustand deines Browser-caches immer wieder anders ... Ich habe jetzt bei allen 3 Rechnern den Cache gelöscht und gehe über das Hauptforum rein ... auf einem Rechner ist's sauber formatiert, auf dem anderen zentriert, ein paar Stunden später wieder andersrumby VDX - Offtopic
... echt blöd - gestern Abend war's eine Zeitlang wieder wie gewohnt, heute Morgen ist's wieder weiß und zentriert Sebastien ist dran und meinte, daß die Settings immer wieder mal ins Nirwana verschwinden würdenby VDX - Offtopic
... some time ago we had some discussion regarding Skeinforge and LOM-toolpaths - i managed to output some paths for lasercutting a laminated minimug (atached image). For breaking away the outer volume i made another hack: - if you 'cut' the 3D-object with a boolean subtraction from a bigger block, then you'll receive an inverted object-representation you can directly cut or mill with a LOM-systby VDX - General
... na also, meine Bitte nach 'Rückbesinnung' wurde doch noch erhörtby VDX - Offtopic
... can someone please reformat the german (maybe other too?) sub-forum to left-aligned and in a more common viewby VDX - Administration, Announcements, Policy
... die Formatierung scheint mehrfach umgestellt worden zu sein ... mal war sie mittig, dann linksbündig, jetzt wieder mittig Tipp für Firefox: - in "Ansicht"->"Webseiten-Stil" "kein Stil" anklicken, dann ist's wenigstens wieder linksbündigby VDX - Offtopic
... have a look at Skeinforge - it's slicing a 3D-STL-object in single slices, outputting them as sequencial SVG-array (SVG=Scalable Vector Graphics fileformat) and generating G-code from the SVG's ...by VDX - General
... search for 3D-MID-methods - here you build with a plastic mixed with metallic particles or salts and convert parts of the surface by heating/burning with a laser into conducting trays and grow metallic copper on this thrays with electrochemistry ...by VDX - General
... i used silver-filled Polyimide for bonding wires and drawing short tracks - ist's fairly good conducting, but not absolute stable over time and temperature-changes. It's a viscous paste, can be dipped, dispensed, drawed ... then cure around 120 centigrades to 'solid' ... but it's really pricey tooby VDX - General
... atztek made some tests with fusing laser-printed toner stacked to 3D-objects: - seems working ... look here in the german forum ...by VDX - Mechanics
... i made some lasercutting and laminating with different materials (steel- and ceramic sheets) - some discussion was here and here ... Most of the work was under NDA but actually i'm already busy developing some diodelaser-modules for cutting sheets and sintering powder for DIY-LOM and DLSMby VDX - Mechanics
... actually a comercial laser-cutter cutting metal-sheets for building/assembling lasercutters would fit in the same category ... and the lasers are much stronger/dangerous - but nobody is suspecting there is something horrific on the wayby VDX - Laser Cutter Working Group
... created Wiki-page "VDX Paste Dispenser" ...by VDX - Paste Extrusion Working Group
... google for "Modbus" and other serial protocolling methods adressing multiple devices over a single bus ...by VDX - RepRap Host
... hier übrigens eine gute Idee für eine DIY-Kappsäge, die das nützliche mit dem notwendigen (Ausgleichssport) verbindet Nur die Schutzmaßnahmen müßten mit Schutzblechen und Drahtgittern noch etwas optimiert werdenby VDX - Offtopic
... falls jemand stabilere Aluprofile braucht ... ich habe in der Garage noch einen kompletten Unterbau in 60x60 'schwereres' Industrie-Profil da ...by VDX - Offtopic
... for FDM-fabbing you need something adhesive the molten plastic can bond to - here grease can't support the bonding. For Paste-dispensing it could work, but then ist's easier to mix different pastes perfect suited for the special needs, than working with 'simple' grease too ...by VDX - General
... die Billig-Toaster mit den offenen Glühdrähten dürften ebenfalls mit Kleinspannung betrieben werden ... eventuell mal einen kaputten Toaster zerlegen und schauen, was für einen Widerstand die Drähte haben und ob evtl. was von der Elektronik brauchbar ist?by VDX - Offtopic
... für ein ähnliches Problem auf einem kommerziellen Klebedispenser haben wir uns eine 20mm dicke Aluplatte mit 4 Bohrungen quer durch und eingesetzten Quartz-Heizstäben gebaut - damit haben wir die Platte um 80°C herum temperiert. Ähnliche Quartz-IR-Heizröhren habe ich aus einem Toaster - das sind etwa 8mm dicke matte Glasröhren, die wenn sie beheizt werden, orange glühen und ich kann innendriby VDX - Offtopic
... i made it mainly as demonstration for the magentic-spheres-joints, but it would be fully functional for my normal building dimensions of some centimeters in size and until 10 microns accuracy. Here is an even smaller tripod with solid-state-hinges and high accuracy (some nanometers) piezo-motors. And a friend built a much bigger system similar to mine with linear motors from isel capable ofby VDX - Delta Machines