... make heavy shielding and wrap all cables in conducting material - e.g. stanniol or copper-fabric. When i built a laser-cutter, where the laser-driver was emitting frequencies in the same range as the chopper i made all PCB's with isolation-milling, much extra ground areals and shielded cables, so the laser didn't knock the steppers out ... Viktorby VDX - Controllers
... and here the milled set of mini-pieces: I used a sample-sheet of laminate with 0.8mm thickness and milled with a 1mm-head. Viktorby VDX - General
Update: ... die bestellten Motoren sind heute Vormittag per Post rausgegangen, sagt evtl. Bescheid, wenn sie ankommen. Jetzt sind nur noch 3x 1,53V/3A-Motoren, 6x 24V/0,18A die schwby VDX - Altes Forum
... i've designed a complete set of stacked pieces: If someone is interested in milling or fabbing them i'll append the DXF-output and when converted for my mill there would be optimized DXF, HPGL or NCP ... i'm searching a GCode-converter ... Viktorby VDX - General
Hi Noz, ... there were some kits with plastic-robot-arms for educating and hobby in the last twenty years, so a search at ebay could help ... Another way is the Lego-NXT/Mindstorms-set with three servos and a controller, so you could by on your own. Or dive in the robot-comunity - for hexapod-robots see Matts blog: - here they use 4 to six 'simple robot-arms' as legs of a poly-pod. With theby VDX - General
Hi Tony, ... good job! So the reprap can make his own PCB's too With some more development the point of 100-percent-reprappability of the mechanical and electrical components could be reached this year - and then aim fabbing the electronics too ... Viktorby VDX - General
... an update for 3D-stacking chess-pieces: Milled from 3mm Foamalux, total height 4cm. Actually my sons insist in building 'personalized' figurines for their favorite boardgames - when i'll do this, it would mean some months designing and milling Viktorby VDX - General
Hi Tuchs, ... ich schaue heute Abend, wenn ich wieder im Keller bin, nach den genauen Daten. Hier erstmal vorab: die 42-er Motore sind in der Mehrzahl 100-Schritt-Unipolarmotore aus alten AEG-Typenrad-Schreibmaschinen, aber auch ein paar 200-Schritt-Bipolarmotoren von Berger-Lahr oder aus alten Festplatten. Spannung und Strom muby VDX - Altes Forum
Hi Larry, > Do you have any information on what that special > mixture is that resists separation around strong > magnetic fields? (Or have some idea of how to > track that info down.) I've only read about > ferrofluids, but haven't used them for anything, > yet. Very interesting idea. ... my friend made some ferrofluid-research at Charite in Berlin for medical applicationby VDX - 3D Scanners, Book Scanners, and Optics
Update: ... die 4 Hellblauen Motoren sind weg ... Viktorby VDX - Altes Forum
... you can simplify the system by reducing the amount of sensors ... and you can build a probe-stick with only two magnets, when you atach the magnets to the stick, give the ferrofluid on the magnets and fix the ferrofluid in two sensor-cages too: But it's much easier to lathe a perfect symmetric shape then find an absolute perfect magnet ... There are many possible designs, but my first sketby VDX - 3D Scanners, Book Scanners, and Optics
Hi bjathr, ... i don't know exactly what you mean - this setup is a set of two half-cages with orthogonally oriented capacitive sensors, which measures the distance between the conducting pads and the sphere(s). From the displacement of the two spheres you can calculate the weight of the probe-object itself, the 3D-orientation in space (tilt-n-nip), dynamic displacement through vibration and evby VDX - 3D Scanners, Book Scanners, and Optics
... there are some people like me, which already have a CNC-mill - so there are some synergetics between this two different concepts (subtractive vs. additive fabbing). I hope to combine this and some other fabbing methods by simply adding tool-heads and software-options: - milling / cutting - FF-fabbing (=reprap: extruding molten plastic) - paste-extruding at room-temp - laser-cutting of thin sby VDX - General
... with half- or microstepping the count of enrgitized coils and the current per active coil vary in respect to the actual position. The motors have different currents, torques and thus heating when staying energetized in a "fullstep-position" or between. You can avoid excessive heating with reducing current in pause-mode - this is common in comercial stepperdrivers and is normally made by enaby VDX - Controllers
... nun wird's etwas knapp mit dem Motoren - Marcel hatte auch schon sein Interesse angemeldet. Da die Motoren unterschiedliche Werte (Nennspannung -Strom und Spulenwiderstand), aberby VDX - Altes Forum
Hi Max, ... ich dachte da an 5 Euro pro Motor plus Porto - also 25 bis 30 Euro. Viktorby VDX - Altes Forum
... better remelt the surface with a mikro-gas-torch ... Viktorby VDX - Let's design something! (I've got an idea ...)
... the future of fabbing isn't subtractive or additive ... let the object (or your complete environment) change shape or behaviour at wish - i like the concept of 'utility fog' or Catoms: Viktorby VDX - General
Hi Max, ... wenn du Schrittmotore suchst, ich habe noch ein paar Typen bei mir rumliegen: Die beiden Groby VDX - Altes Forum
... try with cooling the grinder and the material prior to act - be carfully with plastic parts, beneath -10by VDX - Plastic Extruder Working Group
Hi b.abu, maybe some of the concepts here or here are interesting too? Viktorby VDX - Mechanics
... go through the links in this thread: - especially the high-accuracy parallel-scara-concept in the harmonic-drive-paper in the last post ... Viktorby VDX - Mechanics
... or build your 3D-forms with paperwork ( ) and fill them with mineral-filled epoxy too. Here you can construct and assemble every shape and complexity and receive any rigidity you want in respect to the filler ... Viktorby VDX - General
Hi Demented, ... but the want very high precision and surface-finishing, so a the reprap should be able to fab with 0,01mm accuracy! I think the combination of a coarse FFF-head with a finishing mill could be the hit Viktorby VDX - General
... when stiffness is the target, then you can make hollow structures out from reprapped plastic-parts, cutted plasticsheets (or even paper: ) and fill them with concrete or sand-filled epoxy. With this method you can build as stiff and big frames as you want ... Viktorby VDX - General
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