Hi sid, ... the only important value is the capacity. The voltage is only a max-isolation-type-value - you can use any higher voltage you find - it should be only some volts higher than your max. applied voltage in the circuit or you'll be possible to receive shortcuts through the capacitor ... Viktorvon VDX - Controllers
... look at this video: (ignore the other ads ) for a really impressive active 3D-puzzle. The (merely) conical gears can be fabbed and this types of 'brain-catcher' would be the absolute hit! Viktorvon VDX - Let's design something! (I've got an idea ...)
Hi sid, with 1. and 2. you're measuring a network of diodes and resistors - this could tell you strange values and some multimeters have high enough measuring currents, to activate gates ... For 3. - when you can't find another 1von VDX - Controllers
Hi Chris, ... the "0.2"-size is simply the transfer without conversion from mm to inch - multiply with 25.4 and you have 5mm ... Viktorvon VDX - General
Hi Martin, old plotters had normally a resolution of 0,025mm (1/40 mm) what was enough resolution for pen-drawing but not enough for laser-cutting. My CNC-mill has an accuracy of 0,0125mm with halfstep or in single micron-range (or even sub-micron) when driving with microstepping (i have 1/8- and 1/256-microstepping-drivers). So a conclusion: - for a 'perfect' resolution where you didn't see avon VDX - General
Hi sid, i have an ISA-card GPIB-interface and a second 'naked' PCB somewhere in my stock - i think it's the same as HPIB, but i didn't have running software or a working PC with ISA-slots at hand. This should be an assembled kit out from a book of 1985 or so, maybe with a floppy and some software on it, but i have to search to find the book and the parts. Tell me if it's worth a try ... Viktvon VDX - Controllers
... ooops - a variable-size with 16 bits means 6,55 meters with an accuracy of 0,1mm or 65,536 centimeters with 0,01mm accuracy - this could really be a problem ... Viktorvon VDX - General
... long should be enough - it's a count of 4294967296 steps or 4294,97 meters (or 4,3 kilometers) per axis-variable when measured with an accuracy of 1 micron! Viktorvon VDX - General
... if you didn't want to feed power-wires to your toolhead, you can use a lever in form of a L-shaped alu-profile along your Y-arm which lifts the pen when been turned by a solenoid or small motor. Some good oldstyle XY-plotters use this instead of a solenoid in the head ... Viktorvon VDX - Reprappers
Hi Martin, ... you have only to measure and scale the step-per-mm-ratio when you change the frame-size or gears. The only problem with very large objects and high accuracy could be overrun of the coordinate-values when driving past the highest possible value - i didn't know, what type (long int, double or higher) is defined actually ... Viktorvon VDX - General
... thanks for the info, should be interesting for some other problems i actually have too ... Viktorvon VDX - Plastic Extruder Working Group
... look here: for another methode. Viktorvon VDX - Plastic Extruder Working Group
... main problem with a granule/scrap-extruder could be bubbles in the filament, which would disturb the flow-homogenity and so the fabbing quality. AFAIK the long paths and high pressures in common extruders are mainly needed for driving any embedded air out of the filament ... Viktorvon VDX - Plastic Extruder Working Group
Hi Andreas, ... thanks for the info, i made a glimpse. I think i'll join the FiTe-forum in the next days - so long ... Viktorvon VDX - Reprappers
Hi Annirak, AFAIK copper-dust isn't suitable because of massive oxidisation of the particles. Most conductive pastes i know use silver-flakes in polyimide and are heat-cured. What's possible too are silver-flakes in acetone or another easy evaporating solvent, but then you haven't a solid/rigid material, so this would only work with embedded trays or vias only ... Viktorvon VDX - Plastic Extruder Working Group
Hi Andreas, ... it's not essential, which brand or type of construction kits you use, but sometimes ist's a more than philosophical question My sons (8 and 10 years old) have some lego-technics and lego-educational kits and can build/construct on their own ... But it's a dispute every three or four months, if i'll give free my FiTe - it's more parts, more stable and somehow easier to build rivon VDX - Reprappers
Hi all, here i'll post some images and progress when building some paste-dispensers of different size and later some fabbing-samples ... First the images of pre-assembling a 'mini'-dispenser with a 5ml-cartouche 1. - all parts: 2. - pre-assembled an in 'load'-position: 3. - 'empty'-position: Next i'll complete this type with a fixing-clamp for the cartouche, make some testt and buildvon VDX - Paste Extrusion Working Group
Hi Andreas, ... great job! It's interesting, how distributed Fischertechnik is - i know only three guys in my radius (maybe 1000 people), which have some and only one of them (beside me ) has enough parts and interest building complex machinery ... AFAIK FiTe is a mainly German brand and market. Maybe an intersting question --- can anyone out in the world knowing or even possessing FiTe sendvon VDX - Reprappers
Hi khiraly, avoid disconnecting and/or connecting the motors when the board is powered or your drivers (mostly both 297/298-IC's) will break down - they're extremely sensitive with abrupt changes in load! Viktorvon VDX - Controllers
... ich mach am WE einen Start mit den 5ml-Kartuschen (da ich davon noch fast 30 Stvon VDX - Altes Forum
Hi Reece, ... excellent! - now we have a bunch of 3D-scanning-related links together ... Viktorvon VDX - 3D Scanners, Book Scanners, and Optics
... jetzt sind ein paar gut Ideen gefragt ... Nachdem die Pneumatik-Dispenser nicht genau genugvon VDX - Altes Forum
Hi Khiraly, what motors did you use? I have some old unipolar and bipolar motors which are specified at something like 0,2 to 0,3Nm torque and max 1kHz stepping speed at fullstep but with normal 1IC-fullstep-drivers i got only 750Hz - with halftstep they run with 1,5kHz with weak load. The bigger bipolar motors are from 0,5 to 3Nm, nominal speeds until 2kHz in fullstep but i run them until 6kHvon VDX - Controllers
... hmmm ... you let me think ... And then i remembered some old heating-elements i scavanged twenty years or so ago: This are heaters with 115V AC and 150Watts each. Connected sequential i can plug them direct to the line. Mounted under an aluminium-plate and with an old but working temperature-controler and a PT100-resistor as temp-sensor this would be a perfect heating-bed. I think withvon VDX - Mechanics
Hi Khiraly, ... you need much, much bigger heatsinks for your driver! Look here: - - it's the lower norm for higher heat-dissipation ... Viktorvon VDX - Controllers
... uhh, ... ohh ... here you have to solve the "chicken<->egg-problem" - what's fabbed first? Sometimes i'm thinking/speculating about 'genetic'-fabbers - imagine the possibilities, when you're able to change the genetic sequences of a bamboo-seed, so it would grow in a predefined 3D-shape ... or tool-handles from a walnut-tree ... or metal-parts growing on theri own like manganese nodulevon VDX - Plastic Extruder Working Group
... call it "pet" and you have it Viktorvon VDX - Plastic Extruder Working Group
... on the other side you can use pasta in the extruder for fabbing extraordinary 3D-food-art Or imagine a multi-head-pasta-fabber (pasta, minced meat, pesto, ...) for ravioli, complete pizzas or such ... Viktorvon VDX - Plastic Extruder Working Group
... the smallest needles i used were 0,1mm OD or 0,06mm ID for micro-vacuum-gripping. AFAIK they're only usable for fluids like water or acetone ... For paste i used needles with 0,15mm ID - but i had to shorten the length for constant flow or it would stall over (drying) time. For the rudimentary specs of my Pico-dispenser you can look here: - i used a kind of dipping needle with some trickyvon VDX - General
Hi Chris, your parts are impressive even with 0,5mm filament! Have you managed smaller diameters than 0,3mm? What's your max. possible pressure? I made some tests with paste-dispensing, but have to build a better changeable head ... Viktorvon VDX - General