Hi Sean, ... for risers or vias you can insert metall-pins or silvercoated copper-vias (as used in manually assembled double-layer-pcb's) in the wet paste. Viktorby VDX - Paste Extrusion Working Group
Hi RoundSparrow, ... the 57BYG009-motor isn't as worthy, as the 11A in the - Look at the higher current - 2,4Amps against 1,7Amps - only half the holding-torque - 6 kg.cm against 110 N.cm - and it's only single-shafted As for the price, the 11A seems to be a better deal for me ... Viktorby VDX - Mechanics
Hi RoundSparrow, ... the 11A-Bipolar is stronger (~6 Volts, 1,7Amps in serial-arrangement), dual-shafted and cheaper, so it's my favorite ... Viktorby VDX - Mechanics
Hi Fernando, ... yes! that seems to be the ideal basis for electric circuits - touch-safe, but conducting Can you try to apply a higher current to the trays and look, if they change in resistance? Copper isn't so stable in some polymers, so after a while or with higher currents it oxidize and the conducting went poor or vanish completely ... We use a heat-curing polyimid-silver-paste, whichby VDX - Paste Extrusion Working Group
Hi RoundSparrow, ... with the Tripod i'll try to develop a sort of easy to assemble 'micro-reprap' with much higher accuracy, as achievable with a FDM-extruder. With the magnetic joints and the parallel kinematics i only need three linear drives as showed in my setup, six rods, two plates for fixing the drives and a third plate for the toolhead (plus some screws and glue for fixing) As the sizby VDX - Mechanics
Hi Howie, ... not to mismatch, the 'Seil-Tripod' was only a sketch to demonstrate wire-feeding mechanics, my actual Tipod is built with threaded rods, not with wire-feeding and the images from the other wire-driven system are from an old laserplotter, i built some years ago. Tell me, which concept is your target basis, then i can send you probably some more infos ... Viktorby VDX - Mechanics
Hi RoundSparrow, ... there should be a security-check for overheating and/or the reprap shouldn't be used unadvised! As i'm trying with laser-sintering and -cutting, i had some thoughts about removing the toxic gases too - for my testing i used a coal-absorber-filter and ventilated the fume through a tube in the garden When someone uses plastics or solvents, which exhaust toxic or even weak hby VDX - General
... i'm on a similar way with my converting cartesian output into moving-paths for my tripod-setup ... It's a bit trigonometric and a bit 'Bresenham' - look in the wikipedia for the linear and circular Bresenham-algorhythmus, here is sketched, how you can move two (or even more) axes on a calculated path without to much pixel-errors ... Viktorby VDX - General
Hi Brian, ... a fair conclusion and summary My path ist something between - i from time to time used 3D-mills in job and at home, actually i'm on activating an old CNC-system as 3D-mill again, so i can make milling at home too and tinker with my children in ideas, designing and fabbing freely ... And i'll tune/update the system with a paste- and FDM-extruder, so i can play with RepStraping toby VDX - General
Hi Sean, ... every conducting surface would do, even graphite-powder in glue ... A good deal is to spray glue on the surface and press staniol/alu-foil in the glue. For interconnecting the housing-sides you have to connect the conducting areas together (maybe with stripes of conducting material too) and to ground, or the shielding wouldn't be effective ... Viktorby VDX - Reprappers
Hi RoundSparrow, ... i can help you with the design and making STL-files - simply send me the sketches ... If you want to build bigger rectangular housings, it's maybe easier to reprap only the complex connecting and designed parts and saw/mill the housing-plates out from plastic-sheets or aluminium (EM-shieling) Viktorby VDX - Reprappers
Hi Howie, ... for more details of the parallel-axis tripod and a video, where i manually play the kinematics, you can go to the actual builders blog: For another stringy mechanic you can look on the drawings in my third post here: Viktorby VDX - Mechanics
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
... 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
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
Hi Demented, ... a spam-bot dropped in after William and Sebastien removed this posting, so it's even again ... Viktorby VDX - General
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
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
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
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
... hihihi ... i runs conform with subject 3 Viktorby VDX - General
... damned! clever beasts (or spambot-programmers) - that means even captchas are obsolete now ?!?by VDX - General
... have a SPAM-bot solved the image-code?by VDX - General
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
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
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
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
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
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
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