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Re: Reprapping Engines - 16 years ago
Hi gene hacker, ... another problem with the EBM is the vacuum you need and maybe the cost, if you weren't wealthy enough ... SLS (Selective Laser Sintering) is better fitting - i'm playing around with 1Watts- and 8Watts-diode-lasers and some metall-powders with different viscous fluids as paste, what seems to work very well. With the 8W-laser (used power ~4Watt, spotsize ~80 microns) i workedby VDX - General
Re: Whens RepRap likely to take off? - 16 years ago
... the fab@home-guys made funny electronics with embedding conductive trays in elastic polymer, cover the tray-canales with polymer too, so that's a closed sandwich-structure and then insert the electronic components through the cover ... So you have an elastic sheet, which you can bend and roll on a curved surface and you can replace blowed components, if needed. Play this a bit further, withby VDX - General
Re: Polar printer, assistance needed - 16 years ago
Hi gene hacker, ... looks very impressive! This seems to be an interesting alternative for support and intersecting parts. How fine can the surface be formed/sculpted, when used with a syringe and only wetting small areas? Is it possible to extrude the fluid without crystallisation in the syringe? Viktorby VDX - General
Re: Another 3 Axis Position System for a RepStrap - 16 years ago
Hi Demented, ... a spam-bot dropped in after William and Sebastien removed this posting, so it's even again ... Viktorby VDX - General
Re: Large Scale RepRap - 16 years ago
Hi Demented, > Thanks for the sketches. I don't think any of that > scales up as large as we want though. Would be > really finicky. ... of course, when i was counterchecking other patents for my claims, then i found only one similar construction: this was a ship-container-handling bridge-robot with 30 metres length and 7 metres height !!! So the up-scaling isn't the problem ... Viby VDX - Reprappers
Re: Experiences with Online Prototyping Services? - 16 years ago
Hi Zach, ... i used IMT901 1/8-microstep-drivers for my steppers in past - actually Nanotec offers IMT903 1/16-step-drivers ( ) for 8 Euros single-, 6 Euros in 25-bulk. Or the ready-to-use 1/8-step-board SMC11 ( ) for 29 Euros single- and 25 Euros in bulk. Maybe you can design own electronics with the 1/16-step-IMT903 and use coarser and chaeper steppers for better resolution for the same oby VDX - Reprappers
Re: Large Scale RepRap - 16 years ago
Hi Demented, ... here are scans of my sketches for the laser-plotter, i've made for the copyright-documents in 1995. The first similar concept for a simple pen-plotter i build in '80 or so. Ask me, if something isn't clear ... Viktorby VDX - Reprappers
Re: Large Scale RepRap - 16 years ago
Hi Steve, ... replace the stepper and the electronic with an encoder and you have a 'normal' servo-motor. I think it's easier and cheaper to build a servo with a radial or linear measure, then the tandem of stepper and a 'following' DC-motor ... Viktorby VDX - Reprappers
Re: Another 3 Axis Position System for a RepStrap - 16 years ago
... hihihi ... i runs conform with subject 3 Viktorby VDX - General
Re: Another 3 Axis Position System for a RepStrap - 16 years ago
... damned! clever beasts (or spambot-programmers) - that means even captchas are obsolete now ?!?by VDX - General
Re: Another 3 Axis Position System for a RepStrap - 16 years ago
... have a SPAM-bot solved the image-code?by VDX - General
Re: Polar printer, assistance needed - 16 years ago
Hi gene hacker, ... welcome on board When i first stumbled over the reprap-project, then i had a similar question to Zach - i hoped to solve the problem of converting the cartesian slices to cylindrical paths for a diode-laser-head, which would cut the contour-lines of a LOM-output (LOM=LaminatedObjectModelling) as in a lathe, but not subtractive, but sheetwise additive fabbing. As no othersby VDX - General
Re: Large Scale RepRap - 16 years ago
Hi Demented, ... with a tripod setup you can scale up unlimited and use best Kardan-joints or self-made crossed ball-bearing-hinges instead of the magnetic spheres. The software is on the way, it seems not to be a real problem, to simply convert the cartesic XYZ-paths to ABC-moving, when i use simple trigonometrics ... By the way - my first home-brewed laser-plotter i build with an orthogonaby VDX - Reprappers
Re: Reprapping Engines - 16 years ago
Hi Sebastien, ... my experience with electrostatic flex-systems weren't so good, that i tried further - i partially filled elastic polymers with graphite and applied voltage (eventually until 2kV!) to expand or bend the structures. The behaviour was similar to SMA's with much lower forces, but much faster activating speed. So if we find a better material-combination which generates higher forcby VDX - General
Re: Support material slump - 16 years ago
Hi Thomas, ... yes, the normal glass-spheres for 'stream-cleaning' didn't have a good quality and the separated are much to expensive - but maybe with a quick'n'dirty cleaning process we can pure the cheap stuff to make a try ... AFAIK the spheres in the fire-extinguishers are brittle hollow spheres or with antioxidant fillings, but should behave in the same manor. By the way - if you drop iby VDX - General
Re: Support material slump - 16 years ago
Hi Thomas, ... my probe is the same stuff for 'steam-cleaning' (in german 'Glasperlen-Sandstrahlen') It's obvious, that in the 'normal' grades you have a wide variety of sizes and broken particles, because of the manufacturing process - i think it's made with spin-exhausting of melted glass ... When i searched for better size-accuracy, then i found nearly 'perfect' glass- and plastic-spheres fby VDX - General
Re: Support material slump - 16 years ago
Hi Thomas, ... i have a kilogramm-probe of ~100-micron glass-spheres from Kisker, which are dedicated for high-accuracy surface-finishing. When i observed the quality and size-accuracy of the spheres, i found different sizes from nearly 5 microns up to 1 millimeter (most between 30 and 150 microns), some broken particles and needles and bulks of coagulated spheres. The consistence isn't reallyby VDX - General
Re: Reprapping Engines - 16 years ago
Hi Zach, ... i didn't want to start a flame-war - if Ian is right and i consume to much 'forum-space', then i can reduce the amount of my posts ... For me the forum is very interesting because of exchanging ideas and evolving some fuzzy thoughts with a backup from other enthusiasts. My biggest 'problem' is maybe the sheer amount of possible interesting stuff and concepts, which accumulated oveby VDX - General
Re: Arduino as simplified comm/controller board - 16 years ago
Hi Zach, ... it's the same for me, with the conversion from cartesian coordinates to tripod- moving. When my electronic works, i have to focus on the conversion, so your library could help me a lot ... Viktorby VDX - Controllers
Re: Reprapping Engines - 16 years ago
Hi Ian, ... excuse me, i didn't want to offend you - english isn't so easy for me, so maybe i was a bit of ignorant? What pushed the thread-size was your declining of my setups as 'engines' and my explaining, that it's one indeed and that's good for 'powering' of pneumatic- and hydromechanics or 'artificial muscles'. So it was for me a legal 'engine'-definition - i think when i can perform movby VDX - General
Re: Reprapping Engines - 16 years ago
Hi Ian, ... if every 'ferrofluid-tooth' can withstand 0,3 bar, then with a sequence of 10 'ff-teeth' in a row i can pump 3 bar difference! If i need 10 bar pressure, then my pump must have 31 free 'teeth-cavities' and 30 'blocking-teeth' (also nearly 60 tooth-magnets in the wheel) for defining the pressure-difference in the radial pump, what's a bit scary ... For this reason i evaluated the Heby VDX - General
Re: Beware this variation on the Spanish Prisoner con... - 16 years ago
Hi Forrest, ... dropped in my Private Messages too ... Viktorby VDX - General
Re: Hi german reprappers, where are you? - 16 years ago
Hi Sebastien, ... wait, until some more members comes together, actually it's not essentiell, germany isn't such a big country Viktorby VDX - Schwarzes Brett
Re: Introduction: Hello, I - 16 years ago
Hi Matt, ... maybe in your next essay you should write a SF-story about sending an 'omni-reprap' to the stars instead of embryos I think, in some future there should be 'seeds' or probes sent to other planets in our or foreign solar-systems, where the probe starts with reprapping a fabbing plant, which builds exploration-scouts and other sophisticated stuff to scan the areal and maybe start aby VDX - General
Re: Easy to build linear stages - 16 years ago
Hi Demented, ... i'll post the next steps of progress in the builders blog - when the software/drivers will work, then some videos too ... Viktorby VDX - Mechanics
Re: Hi german reprappers, where are you? - 16 years ago
Hi Alex, ... you're welcome! How is your status? Are you on the straight reprap or on a repstrap? Until an europe-localized shop is working, the ordering from USA is a bit to troubling for me, so i'm actually on repstrapping .. With my experiments in solved powders instead of FDM it's another branch, but i think with a wider (practically unlimited) variety of materials an shore-values we coulby VDX - Schwarzes Brett
Re: Turkey Roaster RepRap, almost tempting - 16 years ago
... i think, for supporting FDM-extruding, an intermediate temperature of 50by VDX - General
Re: Reprapping Engines - 16 years ago
... the ferrofluid-pump works from low- to high-pressure as good as in the opposite - the red arrows didn't show the active pressure, but the flowing direction, when i turn the weel. The magnets are surrounded with so much ferrofluid, that it fills the gap between the magnets, and the stator-walls completely and acts as sealing. Between the magnets are cavities, which wanders with turning the wby VDX - General
Re: Parallel-kinematics versus string-pod - 16 years ago
Hi Zach, ... access would be fine, then i can post some images and videos of progress and some experiments in the blog Viktorby VDX - Mechanics
Re: Easy to build linear stages - 16 years ago
... i'm nearly ready with the mechanics of my vertically aligned Tripod: (from here: ) Viktorby VDX - Mechanics