Hi Larry, ... its an Isel C-142 controller which is capable of 6A@70V and 10 kHz maximum steprate. Additionally i have three IMS-1/256-microstepping-drivers with 3A@30V, and max. 10 kHz too, which i can exchange with the Isel drivers for higher accuracy. In my 'scrapery' there are some IMT901-drivers and a SMC11 from nanotec - all 2A@30V and 1/8 microstepping with more than 10 kHz. My controlvon VDX - General
... look here: Viktorvon VDX - Mechanics
... maybe it's all based on the same cause? My first thoughts when diving into Transputer-specs and Occam were about overrunning some serious performance-problems i had with other computers and OSes ... maybe it was simply so good, that the other vendors tooks all neccessary steps to stop them from penetrating the market In the last 30 years there were some similar occasions, where superior sovon VDX - Controllers
aka47 Wrote: ------------------------------------------------------- > ... > I must confess to being a bit of a parallel junkie > having done some professional work with Inmos > Transputers some years ago. > ... ... me too - in my diploma-thesis (around 1988) i had to research the possibilities of massive parallel networks for numberchrunching and simulation of physical problemsvon VDX - Controllers
... the propeller ( ) is a multicore-chip with 8 32-bit RISC-CPU's inside capable of realtime-video-generation and much much more In fact it's much more cpable than the arduino but it's harder to code too and lacks enough IO's. In the propellurino it's an interfacing part for realtime video and audio and could be much more in respect of numberchrunching or higher level logics. Maybe this wilvon VDX - Controllers
... i think you can't compare a constructed/fabbed apparatus with a biological system as the actual mechanics aren't capable of 'growing up'. Whereas some of the behaviour of the development process could be comparable to evolution, the fabbing process is complete different. Why shouldn't a smaller reprap build stackable elements which assembled represent a much bigger part than the fabbing arevon VDX - General
Hi Grogyan, there are some methods and materials for building really stiff and big frames - e.g. big and high precise CNC-mills are built from stone, not from steel or aluminium. Similar DIY-frames are made from hollow structures out of steel or aluminium and filled with sand-epoxy-mixtures, what's a really rigid compound sometimes even better than real stone and much cheaper and easier in handvon VDX - General
... for 'really big' repstraps you'll use much sturdier/stiffer materials (there are big cartesian 'bots' for handling ship-containers with some ten meters dimensions) or you'll try with parallel kinematics and lightweight rods made from carbon. I made a tripod setup with hinges made from magnetic orbs ( ), that could easily be scaled up or down (here i scaled down ), but the controlling softwavon VDX - General
Hi all, here: you can find a 'Propeller'-shield for the arduino with the capabilities of video- and audio-interfacing and some more capacity - maybe it's interesting for the Arduino-RepRap too? Viktorvon VDX - Controllers
... my 1.8°-steppers with 2Amps (@60V-f/h, @30V-microstepping) can drive safe until 2kHz with fullstep, 5kHz with halfstep and until 10kHz with microstepping (max. steprate of my controller/drivers ). So with direct driving and a 5mm/rev-spindle i have 50mm/s @full-, 62.5mm/s @half- and the same speed at 1/4- and every slower (but more accurate) at higher microstepping-ratio ... Viktorvon VDX - General
... i've found small chainwheels and chains in different sizes and lengths (smaller formfactor than bike-chains) in old copiers - there are many other usefull parts for repstrapping too ... Viktorvon VDX - Mechanics
Hi Walter, ... i use hollow glass-spheres (=eccospheres from Trelleborg) around 50 microns in size until 400 centigrades, solid glass-spheres around 100 microns (until 1000 centigrades) or molten rock-spheres around 200 microns (until 1500 centigrades) from Sil-trade mixed with waterglass. There are some comercial mixtures based on waterglass with talkum and different additives for temperature-von VDX - Paste Extrusion Working Group
... the hard and abrasive particles in most ceramic slips would damage the pump, so you need another design (e.g. a peristaltic one) or you mix with microspheres which are round and smaller in diameter than the gaps. Viktorvon VDX - Paste Extrusion Working Group
Hi Kerstin, Kerba Wrote: ------------------------------------------------------- > up to now I have exactly one response for RepRap > ;-) > But I only started contacting RepRap folks today, > so I assume you found my survey somewhere else. ... ooopps, this one should be mine - i stumbled in your call at fab@home ... I hope there will be some more activity here Viktorvon VDX - General
Hi Kerstin, i've run through the survey some days ago - have you already collect some representative data? Viktorvon VDX - General
... it's my aim too to cocreate a "technological environment" where everyone is able to produce all he need either on his own or he can find it in the local sphere - from food over clothes to sophisticated hardware. But in this world most of the common markets and commercial structures aren't stable or needed any more, so it could be a very hard/dangerous way there ... Viktorvon VDX - General
... a good reprappable redesign of the extruder ... Viktorvon VDX - General
... we had last year some talk about measuring the extruding-speed. One possibility is marking the filament with colour-dots for visual sensing, another is embedding some magnetic microparticles and magnetize single segments and measuring with a highres Hall-sensor. AFAIK sensing without marking was not possible as the extruded filament is very homogene in colour and occasional air-bubbles werevon VDX - Mechanics
... the lower border is dependant of the accuracy/resolution of the positioning system and smallest diameter of the extruded tray or dispensed droplets. Actually i'll guess the best achievable accuracy is around 10 microns (RepRap is designed/specified for 100 microns accuracy) - i have mechanics, electronics and reference-switches that are capable of 0.1 microns accuracy, but the mechanical setvon VDX - General
Hi Sven, Willkommen Ich bin im Rhein-Main-/Main-Kinzig-Gebiet Daheim - wie's aussieht, sind die RepRapper in D noch ein recht selten anzutreffendes und ziemlich verstreutes Völkchen, so daß nur selten lokale Gruppen zusammenfinden Ich hoffe doch, daß sich das in der näheren Zeit ändert! Ciao, Viktorvon VDX - Schwarzes Brett
... first comercial 3D-LOM-printers around 1994 used 'endless' paper-sheets from a roll, were laminated with a heater and contour-cutting was made with a CO2-laser. The fabbed parts had a look and were nearly stiff/rigid like wood. A 'modern' LOM-printer i found some years ago used endless PVC-sheets, laminating/fusing was made with some sort of solvent and cutting with a knife - the price was avon VDX - Reprappers
Hi Max, ... was mir als mögliche kostenlose Quelle auch noch eingefallen ist: - bei uns auf dem Bauhof im Altgerätecontainer findet sich ab und an auch mal ein alter Haar-Fön oder Toaster - beide haben brauchbare Heizdrähte drin Viktorvon VDX - Altes Forum
Hi Max, anbei erstmal eine Skizze mit 2 parallelgeschalteten LM317 á 1A, also für genau 2A Stromausgang. Für mehr Strom kannst du entsprechend viele der Stromregler parallel schalten. Ich betreibe damit Lasedioden mit. z.B. 6 parallelen LM317 á 0.7 A für 4.2A Maximalstrom. Den Eingang kannst du mit einem Halbleiterrelais oder Powermosfet per PWM beschalten, dann mußt du den Puffferkondensatorvon VDX - Altes Forum
Hi Max, wenn du in etwa weißt, wieviel Strom du benötigs, um den Draht 'dunkelrot' aufzuheizen (ab Hellorange/Gelb geht er langsam kaputt), kannst du einen simplen Stromkonstanter mit einem (bei <1.2A) oder mehreren LM317 aufbauen und den Draht damit per PWM von 0 bis max. Leistung durchsteuern, ohne ihn zu gefährden. Such dir im Internet eine LM317-SChaltung als Stromkonstanter (besteht nurvon VDX - Altes Forum
Hi Fabian, ... es gibt hier schon einige Basteleien mit Steppern - du mußt dann 'nur' in der Software statt PWM die passenden Schrittpulse für den Motor ausgeben ... Viktorvon VDX - Altes Forum
... schau mal im Bauhaus nach dem Ersatzdraht für die Proxon-Styroporschneider - das ist eine Rolle mit 30m (ich glaube) 0.2mm-Draht drauf und kostet auch nicht die Welt. Zur Not kann ich dir auch mal einen Meter zuschicken ... Viktorvon VDX - Altes Forum
... you can search someone with a CNC who can mill-route PCB's. I'm doing this sometimes, but located in Germany Viktorvon VDX - United Kingdom RepRap User Group
... this spam-bots are really annoying Viktorvon VDX - General
... AFAIK some development in 'cooperative robots' was done with measuring the exact position and orientation of the specific bots by triangulation with coloured lights in the corners of the working area or simpler with ultrasonic beacons placed around. For robot-soccer the bots are colour-tagged on top and the position/orientation is measured and calculated with cameras above the arena. Anothevon VDX - Mechanics
Hi sid, ... some years ago i had to redesign a manually operated SMD-placer from Finetech into a camera-controlled microassembly system. That was a really nice mechanical setup with two freerunning linear bars in X and Y where the toolhead with a (manually) controlled rotating vacuum-gripper (essential a syringe-tip with a small rubber-cone) is atached on the Y-axis. With iron-strips atached tvon VDX - Pick-and-Place Electronic Assembly (and robots!)