Hi Fernando, ... pulsing is mostly a problem with high-volume-hydraulics - when working with thin elastic tubes and small volumes per collapsing area there isn't so much pulsing, as the length and elasticity of the tube to the outlet acts as mechanical filter too. For really high-precision pumping i'll have some other designs with ferrofluidic or magneto-rheological peristaltics, where the forcby VDX - Powder Printing and Selective Laser Sintering
Hi Erik, ... imagine with magnets and spheres of 10mm diameter - so it wouldn't be so fiddling small The measuring accuracy can be down to nanometers, limited only by the measuring accuracy of the capacitors. The box-size can be something between some millimetres to maybe 10 centimetres (then it's problematic with the pure weights of the components) I built the ferrofluidic actuators and senby VDX - 3D Scanners, Book Scanners, and Optics
... i think for resins with higher viscosisty we should look more in the direction of dispensers ... Beside the motor-driven ones (as in f@h) i'm thinking of a sort of peristaltic pump where at least four solenoids are pressing on a soft elastic hose in an alterated sequence (1000>1100>0110>0011>1001>1100>...) So the fluid concealed in the hose between the collapsed solenoidsby VDX - Powder Printing and Selective Laser Sintering
Hi Fernando, ... i'm wondering all the time, why ordinary CNC-mills aren't defined as "Replicators" - as all parts can be made on a CNC-mill, maybe assembled by a pick-n-place-robot (a modified CNC-mill too), the PCB's are milled too ... and so on ... It's no real problem for me to mill the components of a second CNC-mill on my own and assemble them to make another thingy able of milling similaby VDX - General
Hi Demented, what type of motors do you have? Can you post the data and the wiring-details? It seems the current exceeds the limitations, so possible your drivers could burn too ... Viktorby VDX - Controllers
... here i made a sketch of a high precision 3D-prober (sub-micron-accuracy!) i developed some years ago: The self-centering of the spheres is made with the ferrofluid-cushions, fixed in the magnetic poles. The seismic body (the probe-tip with the two atached speheres) should be made of a lightweight material but with a conducting surface - e.g. aluminium or coated plastic. As it's a completeby VDX - 3D Scanners, Book Scanners, and Optics
Hi Fernando, AFAIK Objet ( ) use UV-hardening resins, but with bigger nozzles. Normal ink is fluid as water (as it's mostly water indeed ), so it wouldn work with liquids more viscous ... Viktorby VDX - Powder Printing and Selective Laser Sintering
... i didn't calculate for the efficiency ... My idea was to arrange as many handmade two-wire-elements in a solar focus as possible, the same count of corresponding elements behind the mirrors in the shadow and then let it go ... For me this would be the simplest way for a solid-statem, longlasting and completelly DIY solar-element, regardless of efficiency or whatever. You need only some glaby VDX - RepLab Working Group
... poser is nice for posing predefined figures with poser-specific parameters, but not so good for constructing them - i worked sometimes with Poser 3 and 5 for populating 3D-scenes constructed elsewere ... For constructing 3D-worlds, objects and sometimes figures too i use Lightwave and sometimes 3DSMax, here you have the right environmet and tools. Viktorby VDX - Let's design something! (I've got an idea ...)
... the manufacturer of my old CNC-mill redirect some of their customers to me which want to mill dental prosthetics - preforms from wax and ceramics from zircondioxide. They're mostly dentists or dental technicians, wanting some hints and informations about low-cost-fabbing, as most comercial systems for this are in the price-range above 50.000 Euros Viktorby VDX - General
Hi Robert, ... sounds a bit optimistic, isn't it? When you didn't have hardcore experiences, then calculate some days more ... Viktorby VDX - General
Hi Alexandre, i build this powersupply many years ago as a DUY-project from "Elektor" - a german electronic-magazine. You can find similar schematics on the web - if you didn't find them and want to build this on your own, then i can sketch the schematics ... Here the old prototype: And here an optimized PCB with two inserted LM317: ... other side: Viktorby VDX - Controllers
Hi Max, neben dem Tripod habe ich mir noch ein paar andere Konzepte angesehen (z.B. ) - mein Favorit ist zur Zeit noch ein Parallel-Scara-Robot (siehe der Link zu HarmonicDrive im letzten Post des verlinkten Threads), da ich ein System mit einer Genauigkeit unter 5 Mikrometern aufbauen mby VDX - Altes Forum
Hi Fernando, ... i didn't get the chance to experiment with UV-curing until now - lack of time, of a scale exact enough and the new job started in May ... But i hope to get round the next weeks, so there is hope The unmixed high-temp silicone has an excellent potlife - the remainings on top of the pot are fluid as if new after 4 weeks in open air! But i think that it's completely dark for UVby VDX - Polymer Working Group
... for driving stepper-motors i likely use linear controlled power-supplies, not switched. My favorized powersupply for heavy steppers is a group of 8 parallel arranged and synchronized LM317 controlled by an UA741CN. Here every LM317 is capable of 1,5 Amps and in parallel i have a powersupply with 12 Amps continuous adjustable until 28 Volts - it works since nearly 15 years without faults andby VDX - Controllers
... bei dem Komplettkit von BitsfromBytes sind soviel ich weiby VDX - Altes Forum
Hi Matt, ... very impressive! I want to output cartesian 3D-data (X,Y,Z) with a vertically oriented tripod ( - look at "Assembling the Tripod"), so it's a similar problem. Can you help me with the conversion? Viktorby VDX - Mechanics
Hi Max, Einzelteile kann ich machen, bei Serien wehre ich mich schon eher, da ich hby VDX - Altes Forum
Hi Max, willkommen! Da lby VDX - Schwarzes Brett
Hi Marcel, willkommen an Bord Wenn noch ein paar Leute dazustoby VDX - Schwarzes Brett
... i get stuck to reprap and fab@home in last year and had some talks with Zach and Evan from f@h. It's obvious that the f@h-system is more mature and 'user-friendly' then reprap, but i bet on reprap, as here is much more 'live-evolving' and seemly endless potential, whereas f@h seems to be 'freezed' in its actual status. But beside, there is no need to flame or blame each other - why not partby VDX - General
Hi fifo2711, ... we had some talk about measuring the tooltip-position with tactile sensors or fixed cameras and such - maybe i'll find some of the threads later ... Viktorby VDX - 3D Scanners, Book Scanners, and Optics
Hi Demented, ... straight sine wave didn't sound so good - when you step in the range from some houndred Hertz to 1 kHz it should be more square maybe with some ripples in the beginning ... Which frequency can you count? Which motors (0,9by VDX - Controllers
Hi John, i think with the "tick and forget"-method moving the stepper is much easier then the close-loop with an encoder (when you didn't stall the stepper) In my CNC-mill i have motors with 200 steps per turn and a threading with 5mm per turn, so i have a resolution of 25 microns per full-step. My controller drives with half-step, so the resolution halfs to 12,5 microns. Now i'm on assemblinby VDX - Controllers
... isn't it a bit to much publicity for the actual status of the project? Some of the reports rouse expectations, that reprap can make anything (beside himself) in no time! Then its obvious, that this expectations will collapse and give a serious backdraft. Better give the development a bit more time, so we can sometimes meet the accuracy of common 3D-printers ... Viktorby VDX - General
... yep, i'm Viktor from Germany in respect to Vik from New Zealand Viktorby VDX - Controllers
Hi Daniel, ich habe ein ganz anderes Problem: Meine CNC-Frby VDX - Altes Forum
... a Stirling engine is much more complex than a couple of fused wires and would wear off by time, so a solid-state system with no need to further support and maintenance should be better. The poor efficiency of the Seebeck-elements should be a factor of the amount of them - combine 10x2 elements (10 hot + 10 cold) per solar mini-dish, arrange 20x20 of the dish-cavities in a panel of say 1x1 meby VDX - RepLab Working Group
Hi Eric, ... for a bot-project we used single optical-mouse-chips with an Atmega-Controller programmed in C and Java: (more images here, in my gallery: ) It's nearly the same solution, but our chip has a 19x19-sensor and too was 'misused' as camera: With a normal webcam you have much more resolution and simpler interfacing, but for singlechip-microcontrollers the 'mouse-camera' with the seriby VDX - Controllers