... tried to atach a ferrule for better handling of the fiber-tip. The removing of the cladding worked, glued the fibre in the ferrule with cyanacrylat and milled/polished coarse (hadn't fine polishing paste then). At home made a fixature for perpendicular polishing (plastic plate with a 1.3mm-bore) and tried with manual polishing ... Seemed to work, but when testing and switched from 1Watt toby VDX - Laser Cutter Working Group
Hi Martin, ... read through the LaserCutter-Wiki and the related threads in the forum ... You need powers above 1 Watt in a spot of maybe 0.1mm, or it's no real fun with sintering Comercial pigtaled diodes are in prices from 200 to 500 Euros, 808nm is 'dark red' and weak visible ... Like posted in the Wiki you can apply a visible pilot-laser (e.g. a pointer) in the IR-beam ... The power-souby VDX - Powder Printing and Selective Laser Sintering
... i'll blog and update the Wiki with progress ... with working prototypes i can calculate the single developing steps from single diodes to atached optics and the different electronics variants. One problem could be if i have to declare all tax-relevant transactions and/or if i start selling with a shop - then the estimated basic costs will double for private and triple for comercial salesby VDX - Laser Cutter Working Group
... i think ataching a focussing lens and cutting is simpler than the powder-handling for sintering. For testing it's comparable ... but with cutting you have much more toxic gases you have to vent ... Here in Germany i can give away a 'naked' diode for 50 Euros, a focussing head and fiber-protecting adds maybe 30 to 50 Euros ... and a complete running module with electronics, optics and rudimeby VDX - Laser Cutter Working Group
casainho Wrote: ------------------------------------------------------- > ... > Maybe right at begin of the page there should be > the warning in big red letters. ... added the atached image as entry-warningby VDX - Laser Cutter Working Group
Hi Casainho, ... as you can see in the atached image, you can melt plastic even with the 'naked' fiber ... without any optics. So the easiest setup will be a power source with 6 or 12 Volts and 5 Amperes and a tunable/switchable current-driver (eg. with LM317's) driving the diode. With moving the fiber-tip close to the powder-surface you'll have a melting spot of maybe 0.2mm or smaller (it'a aby VDX - Laser Cutter Working Group
... most UV-curable resins have really long pot-life in light-tight syringes. Mixing 2K-resins will work, but you'll have some prerun and residues in the mixer-valve. What's a good methode for longer curing-times is print a slice with activating UV-LED's around the tip and ambient UV-lighting with bigger/stronger UV-tubes around the working area. Some UV-resins need the activation and then cureby VDX - Polymer Working Group
... translated the LaseCutter-Wiki into a German version - updates will/should be synchronous in both versions ...by VDX - Laser Cutter Working Group
... ich habe die LaserCutter-Wiki ins Deutsche übersetzt ...by VDX - Laser-Ecke
Hi Reiner, ... nur daß keine Mißverständnisse entstehen: - die 5Watt-Diodenlaser mit angekoppelter Faser sind keine Faserlaser - die werde ich nach Möglichkeit auch verkaufen können ... Der Faserlaser ist ein völlig anderes System, bei dem knapp 30 5/6-Watt-Laserdioden (etwa 160 Watt Pumpleistung) ihre gesamte Leistung in eine dotierte Faser einkoppeln, die dann als Laserresonator mit einer etwby VDX - Laser-Ecke
Hi Casainho, ... with focussing i'll have a spot bigger 0.1mm diameter from the 5Watt-diode-fibre - it's depending of the ratio betwen collimating- and focussing lenses. Good absorbing (dark coloured) materials can be cut ... light, transparent or reflecting materials not. For sintering (DMLS) i have to test, here 5Watts are enough to melt most powdered materials ... For higher powers i can cby VDX - Laser Cutter Working Group
Hi Reiner, ... ich werde meine Ergebnisse hier in Deutsch, in der englischen Sektion und in der LaserCutter-Wiki in Englisch mitbloggen. Ich weiß nur noch nicht, ob ich auch die Ergebnisse mit dem Faserlaser posten sollte, da das wohl eher kein Teil 'für den Hausgebrauch' istby VDX - Laser-Ecke
Update ... ... endlich sind die 5Watt-Dioden angekommen - bisher noch mit unbearbeiteten Enden ... anbei ein Bild, wie 2Watt aus der ungeschliffenen Faser auf 5mm Entfernung schwarzes POM wegdampfen ... Ich habe die LaserCutter-Wiki aktualisiert und werde die nächsten Tage/Wochen die Optik und Elektronik für die Module aufbauen ...by VDX - Laser-Ecke
... i've received some 5Watt-diodes, soldered a simple driver and made some images with an unfinished (rough breaked) fiber emitting 2Watts. The LaseCutter-Wiki is updated and atached is a photo showing how 2Watts power without any focussing burns POM in 5mm distance from the fiber This is a really dangerous 'toy', so any development and fiddling with the active beam should be done only with aby VDX - Laser Cutter Working Group
Hi Tony, ... my lasers have enough power to melt the powder at roomtemp, so i haven't applied a heating yet. Even with the 5Watt-Diodelaser there is enough energy-density for fusing metal powders when moving with some mm/s. The otimizing with ambient temperatures near the melting point is made mostly for high-speed sintering with a scanning laser, where you want to cure a complete layer in somby VDX - General
Hi Tony, ... the temperature of the heated bed depends of the material - good experiences with some 5 to 10 degrees below melting point for weak lasers. Most enclosures arent't airtight - they have the venting/exhausting above the working area and inert gas support per nozzle or cone around the laser spot. You have to vent the fume out of the laser beam, so there should be a constant flow of gaby VDX - General
Hi Cameron, ... i have a CNC-mill, not a reprap, so it's a complete different battling area Actually i'm working without any housing or ambient temperature-control - i have and can apply a heated bed, ambient heaters or IR-tubes when needed, but with micromachining and laserspots around 30 microns and 50 Watts optical power i don't need ambient temperature control. When experimenting with theby VDX - General
Hi Mike, ... no problem, there are many other interesting themes buried somewhere in the forum-discussions tooby VDX - General
Hi Cameron, ... have you some experience or equipment for DMLS? I'm on the way finishing my venting/exhausting, inert gas is the next step. With venting working i'll start with cutting, engraving and sintering - plastic- and mineralic/ceramic powders can be fused with air, so i'll start with black granite-spheres of 0.1mm diameter and try to make solid obsidian-parts ... for metall-dust i'll nby VDX - General
... remember our discussion about Mega-RepRaps and the paper about "Contour-Crafting" ...by VDX - General
Hi Wolfgang, > Viktor du nimmst die Sticheleien doch nicht Krumm > ? Oder ? > Deine Mikromaschinen sind Klasse... (wenn auch was > klein ) ... keine Sorge, da bin ich bereits immunisiert Mein 'Problem' ist eher, daß ich aus einer völlig anderen Richtung auf das Thema zugegangen bin. Während Standard-RP-Applikationen sich über die Jahre von Anfangs etwa 0.2mm Genauigkeit auf inzwby VDX - Offtopic
Hi RedRap, ... nimms nicht zu ernst, das ist ein interner Witz, der auf meine Kosten geht Es ist nun mal mein persönliches Anliegen (bzw. umfelddefiniertes Bedürfnis), mit Genauigkeiten und Auflösungen im Mikrometerbereich zu arbeitenby VDX - Offtopic
Hi Wolfgang, Stoffel15 Wrote: ------------------------------------------------------- > Frag doch mal bei der Nasa nach, vielleicht haben > die ja noch ne Ecke für deine Maschinen in der > Raumstation frei ... bring mich nur nicht auf dumme Gedanken Der Vorteil auf der ISS wäre, daß ich wenn ich eine Luke öffne, auch gleich ein fast perfektes Vakkum da hätte ... könnte ich doch nochby VDX - Offtopic
Hi Wolfgang, ... ich hatte ja auch überall diagonale Verstrebungen drin ... nur wenn draußen ein LKW die Straße entlangfuhr oder im Gebäude jemand die Tür ins Schloß knallte, gab's über den Fußboden und die Wände Schwingungen, die nicht in den Montage-/Fertigungsprozeß reinschlagen durften, sonst war's das z.B. mit dem Einjustieren und UV-Fixieren von Encoderscheiben auf 2 Mikrometer genau Denby VDX - Offtopic
... sowas mußte ich auch mal machen Allerdings konnte ich durch den Einsatz von 'Billig'-Granitplatten für 200 Euro das Stück (anstatt über 2000 für eine zertifizierte Steinplatte) auf einem Stahlrahmen, harte Gummipuffer zwischen Fußboden und Stahlrahmen, weiche konische Gummipuffer zwischen Stahlrahmen und Steinplatten und einer 'selbstdämpfenden' Lagerung des Mikromontageaufbaus auf 'schwimmby VDX - Offtopic
... meine Isel-Fräse steht auf einem Untergestell aus 40/80-er Profilen, was schon recht wackelig ist, wenn die richtig loslegt Für einen stabileren Aufbau und höhere Genauigkeit habe ich noch ein Untergestell aus 60-er Profilen, die ich für den Rahmen einer XYZ-Mechanik mit ultrasteifen Linearachsen nehmen wollte. Dieser Aufbau wird etwas kleiner, als der von der Iselfräse (190x190mm Weg in Xby VDX - Offtopic
... you can find similar nozzles for applying "Window Colors" - i bought a bottle of black "contour-colour" and a metallic nozzle-set with: - a threaded tube for applying to the bottle-tip, a nozzle (similar to the pencil-tips) and a steelwire for cleaning the bore ... The problem for FDM will be the heating - the long tip is hard to heat proper ... For testing with paste-deispensing at room-teby VDX - General
... 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