Hi Alex, ... i think that - either the fast cement is conductive, or you have some additive current through your thermistor what's heating it up, so the reading could be true? Viktorby VDX - Controllers
Hi Anno, for practicable cylinders/pistons you need accurate surfaces, what's not reprappable yet. Better try with elastic materials for structures like the arms of a squid ... Viktorby VDX - General
Hallo Leute, ... da ich schonmal eine Diskussion mit Christine Venaleck wegen Ceramcast angefangen habe ( ), wollte ich hier mal in die Runde fragen, ob es Bedarf für größere Mengen des HT-Keramik-Mörtels gibt? Ich habe gerade ein Projekt laufen, bei dem ich genau sowas brauche - kleben und einbetten von Heizdrähten und PT-100-Sensoren auf eine Edelstahlkapillare in einem Umfeld von 200°C bisby VDX - Altes Forum
Hi Christine, ... first i have to separate between job and private use - the samples would be for tests with an actual project i'm handling with on my daywork - the kilogram-order would be for the same project too. For reprap-use: - germany isn't so populated, i think there are 6 to ten active reprappers here and we wouldn't need more than some 100 grams for our nozzles. Anyway, i'll ask some fby VDX - General
Hi Christine, i'm interested in samples and maybe some kilograms when this material meets our needs. I have to embed some platinum-wires and thermosensors - the coating should be good heat conducting and we have processing temperatures of maybe 300°C to 500°C, so this would be the perfect stuff ... Can you ship some samples to germany? Viktorby VDX - General
Hi all, ... here you can find an open source CAD/CAM-programm for easy creating and milling 3D-objects: Viktorby VDX - 3D Design tools
Hi all, here is a really nice virtual breakoutboard with output to PCB-design software: Viktorby VDX - Controllers
... i just ordered 100 grams of "Roses metal" which melts around 95°C and isn't toxic as Woods metal. I'll test the adhesion on different surfaces - especially wood/paper, ceramics/glass (with waterglass) and some plastics. My hope that this is easier to use than solder ... Viktorby VDX - RepLab Working Group
Hi unfold, ... you must have a REALLY BIG printer! Then it should be no problem to construct your house, unfold it, print, glue together, fill with concrete - and use Viktorby VDX - Mechanics
Hi Leo, what's with replacing the water with waterglass for mixing Alginate? Waterglass shrinks some percents when the embedded water evaporates, but then forms a hard body out of silicate. Search the forums for "waterglass" - i made some suggestions and experiments with ceramic-slurries, but it can be used for other mixtures too ... Viktorby VDX - Plastic Extruder Working Group
... read here: Or search for "paperwork" or "Pepakura Designer" - with Pepakura you can unfold a computer generated 3D-Object into 2D-sheets representing all the surfaces of the 3D-object, print and cut them, then fold and glue to a 3D-body out from paper or thin aluminium-sheets (as i mentioned in the fisrt posts). Then fill the 3D-paper-bodies with some hardening material as 2K-epoxy, concreby VDX - Mechanics
Hi all, ... maybe it's interesting for someone else too: For heating a small volume over 300°C i experimented with a pair of common PT100-resitors - one as sensor, the other as heater. With 30 Volts and 90 Milliamperes the 'heater' reached over 500°C without problems The advantage of measuring with PT100 is the very good linearity ( Temp~(R-100)/0.385 ) The heating-curve was nearly linear tby VDX - Controllers
... actually i'm busy with making slurries for highgrade temperature insulation by mixing the hollow spheres or aerogels with different self-hardening or curable fluids. This sort of material isn't very hard or structural stable - but when building walls out from massive rock-spheres-paste and filling with the isolation material i can make some nice ceramic-objects with hard/stable walls, good tby VDX - Plastic Extruder Working Group
Hi Corwin, ... sorry, it's a bit more complex than only copying sixfold: - when you move one of the outer sliders, then again two fabbing heads are moved simultanous but again perpendicular away from or to this stage. So when fabbing with a hexagonal setup in parallel, you'll get tree identical objects rotated 120 degrees each around the centrum ... and three mirrored objects inbetween too! Soby VDX - Delta Machines
... maybe you should read through this posts: Viktorby VDX - 3D Scanners, Book Scanners, and Optics
Hi Corwin, ... let only the middle-stage of the complete hexagon move down: - then all 6 fabbing heads will move simultan perpendicular away from the stage! With fixing all bars of a stage to a single slider the fabbing heads can move only in the sphere defined by the length of the bars, what's extremely limitating the usability of this kind of setup. So for every move of a fabbing head you haby VDX - Delta Machines
Hi Corwin, ... look at your last drawing - it seems that all the parallel bars atached to a specific stage runs on the same vertical slider. For parallel fabbing in neighbour-areas you have to separate the sliders, so for a complete hexagon assembled from 6 tripods the center-stage should have 6 separate sliders and all border-stages two (or more, when other tripods are atached too) Viktorby VDX - Delta Machines
... some years ago i invented a sort of oszillation-driven linear/radial motor concept what's capable of replacing a motor-gear-combination with two plane sheets and a PZT-oszillator - look here for some drawings: - from Patent-# DE00001994820A1 (or go to and search for author "Viktor Dirks") I made some samples and demonstartors with a coarse 'directional' nylon-sticky-tape - look here: theby VDX - General
Hi Corwin, ... another point is the linking between the linear stages for different triangles - you're extremely limitated in positioning when the lines are on the same slider. You have to separate all the stages per triangle and essentially you have to count all the parts for a triangle, so you can't optimize per bar - every hexagon is built out of 6 completelly separated tripods ... Viktorby VDX - Delta Machines
Hi Mike, ... this is called 'thermotransfer printing' and was one of the first methods of 3D-printing with wax-like colours. I have an extreme old colour-printer 'Okimate 20' for a Commodore C64 which prints with 4-color-ribbons by heating the printing dots with a small resistor-area what 'transfers' some of the coating material in the heated areal from the ribbon to the paper. Some peaple triby VDX - Plastic Extruder Working Group
Hi Corwin, there are mostly geometrical limitations, as the hinges atached to the linear stage aren't stable or defined properly when reaching sideways in the area of neighbour-triangles. For this kind of 'cooperation' between different areals scara-robots (see for some infos) will be much better - they operate around a fixed position and when this position is a rotating axis, they can operateby VDX - Delta Machines
Hi Nishnat, ... maybe you can find some more infos here: Viktorby VDX - Plastic Extruder Working Group
Hi Corwin, with the standard design it's practically impossible to crossover the borders of the triangular base - so you'll need three linear stages for every new triangle, not only one additive. My idea behind the tripod-design was the lower count of parts and the 3-fold symmetry with identical parts what simplifies the assembly. I'm stuck with the software - i first made some progress, thenby VDX - Delta Machines
... look at the development-timescale from the first transistor to the PC and the present situation - this lasted 60 years or so ... Now compare with Feynmans first ideas, Drexlers writings and the present situation - i think this could be a similar progress on a timescale of 70 to 100 years, so maybe around 2040 this could be a real challenge On my private line i mastered the submicron area wby VDX - General
... it's the way into the 'technological singularity' - a situation where anything will be possible and it would be impossible to predict any straight line in social and/or technological behaviour ... Look into the descriptions of utilityfog ( ) or foglets ( ) - and then think some steps further Viktorby VDX - General
... maybe you'll find some more infos here: Viktorby VDX - General
Hi Eric, ... go here for a complete documentation of my tripod-assembly: And yes, it's very interesting, how ideas spread out Ciao, Viktorby VDX - General
... you wouldn't receive focus-diameters smaller 5mm with enough energy - typical lamp-heads for soldering with light are very expensive (typically >2000 USD) and only for spotsizes down to 3mm (sometimes even 2mm). Typical sintering/soldering CO2-lasers with 5 to 20 Watts power will have focus diameters of 0.5 to 0.2mm and the price in OEM is maybe the same, so they're much more effective ..by VDX - General
... only effective in equatorial regions without any cloud in the sky - best working in deserts ;-) You need a really sophisticated piece of software which handles online energy-measurement respective melting/sintering line-speed (energy dissipation over daytime and occasionally dimming through clouds)by VDX - General
... look here: (and especially the image in the first post on the second side) Or the parallel scara robot concept in this paper: Some designs are very interesting in respect of simpler assembly and/or much lower count of parts ... Viktorby VDX - General