Hi Sebastien, count me in I received some mixtures from Fernando/spota but found that my UV-LED's didn't have enough energy to cure the resins in normal fabbing time, so went to comercial UV-resins/glues ... What's interesting too are heat-curing epoxies - at room-temp they have some days pot-life, but harden fast, when heated over 80 centigrades. With diode-laser-heads this should be a muchby VDX - General
Hi Steve, ... you have to adjust the orientation of your model in a CAD-program ...by VDX - Skeinforge
... i won't state it so 'harsh', but it's partially true The basic idea of self-replicating is good, but with our actual situation it's more an academical abstraction, than a real-life-issue ... My position is very different: - if needing something really sophisticated RP-ed, i have the possibility to make it with my CNC-mill at home or print with a comercial 3D-printer at all the needed accurby VDX - General
Hi Sebastien, ... all systems with 'artificial muscles' i know, used many separated tubes with elastic bulbs as actuators and were so something complicate to assemble and adjust I think with designing and printing a single cylindrical body - embedding until some ten capilaries+cavities with a normed array-entry for easy plugging on a valve-array - this should be really easy to reprap (only a cby VDX - General
... what's with designing a monolithic machine out from elastic resins activated by pressure and valves? We had some ideas in the thread "Artificial muscles" regarding this area, but then it fall asleep ... When solving the software/controlling-issues, this should be a >90%-reprappable 'morphing' machine where all needed 'vitamins' are the electronics, an oszillating pressure-pump and a valvby VDX - General
... atached are all my dispensers and cartouches in one image. The pneumatic dispensers (two with the small black boxes and the bigger one with fixature for the CNC-Z-axis) were used for dispensing solder-paste or glue ... they can be used for fabbing too, but the big one is tricky to handle because of the big volume - i have to apply a vacuum-shot when stopping ...by VDX - Paste Extrusion Working Group
SebastienBailard Wrote: ------------------------------------------------------- > Since the filament we use typically fluctuates in > diameter by about 10% there is not much point if > having the axis resolution better than the > filament diameter over 10. In practice I doubt you > would see any improvement with resolutions less > than 0.1mm. > > < 0.1 mm resolution isby VDX - General
Forrest Higgs Wrote: > ... > Shadows are good! They're great places from which > to jump out at the unsuspecting.by VDX - General
... it's not only nophead going 'sidepaths' Like him, Forrest and me there are some other guys working with different setups, tools and ideas as they have other issues than the commom reprapper. My persomal position is mostly defined by the need for higher accuracies, different materials than plastic and some developments with noncartesian mechanics or assembling issues ... This would be realby VDX - General
... another idea: embedd some metallic wires in the gap to fuse and apply induction-heating, what's heating the wires and let the surrounding platic melt ...by VDX - General
... Update zu den "7-Watt"-Laserdioden bei ebay für 15Euro: Es sind Puls-Dioden, die pro Puls 35 Watt abgeben und 15Ampere ziehen. Allerdings ergibt der maximale Duty-Faktor mit 0.08% ziemlich wenig mittlere Gesamtleistung ... ich komme hier auf 28 Milliwatt kontinuierliche Leistungsabgabe (mit aktiver Kühlung!) - mehr geht nur sehr kurzfristig, da die Diode sich dann aufheizt und lange Abkühlpby VDX - Laser-Ecke
... with the LM317 as current-regulator you need 3 to 4Volts mor than you diode will consume - so for the highpower-diodes with 3Volts or more you should best use a 12Volts-source ...by VDX - Laser Cutter Working Group
Hi Ryan, ... i'm actually more busy with my 'cartesian' machines, CNC-lathe and laser-works, but maybe the old builder-blogs about my tripod will give you some ideas ... or search the forum with "tripod viktor" and 'all dates' as time-span ...by VDX - Delta Machines
... it's mainly the differences in needed torques, dynamics, speed and accuracy, what's defining the usability of a machine. For using one set of controller and motor-drivers for all different 3-axis-machines in your hose, you would have to implement a complete set of parameters and voltage/current-switches for every different setup, or if you connect the unit to a machine and use the wrong confby VDX - General
Hi Rob, ... das klingt schonmal sehr gut Auch danke für den Tipp mit den 7Watt-Dioden - hab' mir mal 2 für 30Euro gekauft und hoffe, daß der Update mit "... kauf 2, bekomme 3 ..." stimmt, dann habe ich 3 von den Dioden á 10 Euro. Nach der Beschreibung können die als Puls bis zu 32 Watt, das dürfte dann aber nur mit massiver Kühlung und langen Pausen zwischen den Pulsen gehen. Mal sehen, wieby VDX - Laser-Ecke
... here is another driving and modulating circuit with a transistor ... you have to adjst the values for your diode ...by VDX - Laser Cutter Working Group
... for coarse controlling the output-power of a 8Watt-diode i built a current-driver with 6 parallel LM317 with switches, so i could select the current by the count of switched LM317s in steps of 0.7 Amperes. For finetuning i used a microcontroller generating either constant PWM or a defined pulse-form when activated by an external puls (with a foot-switch for soldering a pad). So i could meltby VDX - Laser Cutter Working Group
... OK, also werde ich wohl "auf 4 Hochzeiten Tanzen" müssen @Rob - willkommen im Team Mit was für Energien/Parametern sinterst du? Ich habe als potentielle Sinter-Werkstoffe z.B. geschmolzene schwarze Granit-Kugeln mit Größen zwischen 100 und 200 Mikrometern, die sich schon mit 1Watt auf 50 Mikrometer fokussiert schmelzen lassen - zum Aufsintern bräuchte ich aber höhere Leistung und einen eby VDX - Laser-Ecke
... hab' im Lasercutter-Forum ein paar Bilder zu den LM317-Stromtreibern und einem Pulsgenerator aus den XY-Steppulsen angehängt. Die nächsten Updates werde ich dann nur noch im Wiki und im Lasercutter-Forum machen, außer jemand will die parallel auch hier in Deutsch haben ...by VDX - Laser-Ecke
... here are some LM317-applications for constant current-driving and a simple workaround for generating geometrical defined pulses for the laser from the XY-clocks instead of calculating the needed power from the moving speed ...by VDX - Laser Cutter Working Group
Hi casainho, > It could be a start for RepRap. We need to start > with simple things and it is more easy to go > further if we get more users/developers traction. > > > > Another flaw is that it's not pigtailed > > Ok, but the prices you gave for pigtailed lasers > are much more! Isn't there other cheap option? or > something in the middle? ... salvaging CD-by VDX - Laser Cutter Working Group
... atached is a photo of 'good' laser-goggles with full blocking at 700-1100nm (diode-lasers and NdYAG-lasers) and 10600nm (CO2-lasers) ... but for CO2-lasers any goggles are good, as the 10600nm-IR-light can't go through glass or plastic ...by VDX - Laser Cutter Working Group
Hi casainho, ... the 1Watt-'burning'-diode is usable for first tests and slow cutting of black plastic-foils ... for cutting paper you need more power. Another flaw is that it's not pigtailed - the emitted light isn't uniform, as you have a nearly rectangular/oval shape of the conical beam, what's resulting in a poor focus-quality. Or you have to apply first a bar-lens and an aperture-filter, wby VDX - Laser Cutter Working Group
Hi casainho, ... you can 'engrave' (or melt small cavities or grooves in) dark, good absorbing plastic-surfaces even with 220mW, but only slow and not in depth. For changing the colour from light to dark you need much higher powers than 500mW - this is depending on the material-absorption, the energy-density (spotsize at specific optical power) and duration-time. The bad thing is the nonlinearby VDX - Laser Cutter Working Group
... i updated "Laser Cutter" in the Wiki - added sketch how embedding a pilot-laser and focussing the IR- and pilot-beams ...by VDX - Laser Cutter Working Group
Hi Sebastien, ... OK, then i'll start the documentation first in german and with time translate/rewrite in english ... I'm learning a lot simply by reading and writing here, but i think for plain english i need some more direct interaction But anyway - my timing problem is lack of time at home, so the development runs only at night (where i can't work noisy) and some spare hours in the weekenby VDX - Laser Cutter Working Group
Hi casainho, ... a comercial pigtailed diodelaser with 8 Watts of power costs me 350 Euro when singlecounts and 250 Euros when ordering more than 5 ... When salvaging a wrecked pumping module, i'll get some ten of pigtailed diodelasers with 5 Watts of power for less than 100 Euros each and optionally they're coupled in pairs and quads, so i can use them as 10 or 20 Watt-modules too ... but thenby VDX - Laser Cutter Working Group
... until now there is no blog - my laserworks were a sort of specialized optimizations and workarounds with comercial systems and mostly covered by NDAs The actual project with the salvaged pumping diodes is free as in OS, so i'll try to blog the complete development and publish in the wiki in english and with the GRRF and/or in the german forum in plain german ... But this wouldn't be a veryby VDX - Laser Cutter Working Group
... for combining small lasers for higher output powers: My single diodelasers have 5 Watts, but the fibres are combined pairwise, so with a combined pair i have 10Watts. I have to check when receiving a complete pumping unit vor salvage - it's possible, that two pairs are combined to 20 Watts too ... For really high powers with diode-lasers you can even combine much more (80+) when focussingby VDX - General