... my problem was the time-span reaching only back to 1990 - my first relevant activities started in 1983by VDX - General
... not only laserprinter-toner - i have some replacement bottles full of photocopier-toner from Sharp, sould work similar and maybe available for cheap ...by VDX - General
Hi Erik, ... last year there were already some nearly identical surveys ... maybe you can compare with them too?by VDX - General
Hi Moritz, ... ist das eine von den oben beschriebenen Puls-Dioden, oder eine CW-Diode? Hat sie ein Fenster oder eine angekoppelte Glasfaser? Kannst du ein paar Spezifikationen oder den Typen nennen? Im Wiki zum Laser Cutter habe ich ein paar Schaltungsvorschläge drin, damit kannst du dir einen PWM-Treiber für CW-Dioden bauen ... für Puls-Dioden benötigst du allerdings deutlich kürzere/schneby VDX - Laser-Ecke
... update: - got another motor with 4Nm without gearbox, so i can use the 2Nm-motor with 5:1-gearbox for a finer turning-table and the 4Nm-motor with 10000 steps per rev. as CNC-lathe-drive. Atached an image with first fitting-test in the CNC-mill - when all fixing and counterparts are ready, i'll exchange the Y-axis with the lathe-axis and can mill complex 3D-parts with a turning axis ...by VDX - Mechanics
... 8 to 9 percents shrinkage sounds needing a complex calculating and after-treatment for fabbing fitting geometriesby VDX - Paste Extrusion Working Group
Hi all, with our actual extruder-design we can't go down in filament-diameter under 0.2mm ... or with some tricks as stretching it by faster movement than extruding speed, and such ... But when using very thin plastic wire, e.g. fishing line with 0.1mm or thinner and a melting/fusing device, you can overcome this limitation. As i posted in the SpoolHead-Wiki-Talk, with direct laser-fusing a thby VDX - Plastic Extruder Working Group
... when heated over 80°C the strong magnetized (over 1 Tesla) NdFeB-magnets start loosing magnetisation - not very fast, but noticeable ... and resin-based magnets even fasterby VDX - General
... what's cheap, what's expensive? Look at the LaserCutter-Wiki - and the regarding forum here ... i'm developing a 5Watt-diodelaser-toolhead capable of cutting foils or sintering powders. I'm estimating the price of single 'naked' pigtailed 5Watt-diodes between 50 and 80 Euros for our reworked salvaged types or 250 to 300 Euros for comercial pigtailed 8Watt- or 9Watt-diodes. With the pigtailby VDX - Delta Machines
... we had in past some threads regarding reprapping valves ... My interests are more directed to DIY-microtech and i've already brainstormed and built some fluidic (mostly acting with FerroFluids or MRF's) systems and valves for small-size-actuators. The best structure i had was a grid of conic holes in a plate and voicecoil-solenoids with a moving needle for every hole (resembling oldstyle neby VDX - General
... right, but it was the nearest hit for morphing tentacles i found ... Some years ago i was in contact with two groups in Germany at TU-Ilmenau and FZK-Karlsruhe which designed pneumatic and hydraulic monolithic roboters with snake-like shape and with many tubes and capilaries through the body capable of complex morphing and sensing with special cavities. My idea is something resembling the iby VDX - General
... update: - received the bigger stepper with 5:1-gearbox for the CNC-lathe ... have to order a collet for the 20mm-shaft first, then i can make a carrier with exchangeability for the stepper or servo. The big stepper has the same parameters as the smaller, so i can use the same controller - it's only bigger, sturdier and with much more torqueby VDX - Mechanics
... microstepping is maybe a bit more complex than that It's highly depending on the mechanical setup, applied torques and the motor-layout. My CNC-mill with 1.1Nm-torque-motors and 'normal' 5mm-per-turn-spindles runs with fullstep at 25 microns and with halfstep at 12.5 microns fairly repeatable (maybe 5-10 microns mechanical inaccuracy). When i replace the halfstep-drivers with 1/256-microsby VDX - Controllers
... here are some videos, showing what's possible with a single 'tentaculus' made from assembled tubes Now imagine, you can print a complete 'polyhydra' with a morphing body and some tentacular fingers as one elastic piece out from silcone, stick the base to a valve-array and let it move and grab/grasp aroundby VDX - General
... last year we had much spam and bot-intruders in the other forums, what seems to be solved now ... this year i flagged 5 or 6 spams in this forum, but it seems to be much more, so maybe it's actually the 'main target' of some spammersby VDX - Russia RepRap User Group
Hi Corwin, ... look here at the atached image "Disp-UV.jpg" - more and brighter should help, but it's mostly an issue with the wavelength too ...by VDX - General
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