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Unsere Laberecke - hier kommt alles rein was nicht in andere Foren passt aber dringend mal besprochen werden muss - gerne auch mit einem Augenzwinkern ;-)
Re: Arduino as simplified comm/controller board - 17 Jahre zuvor
Hi Zach, ... i had to design stepperdriver-boards with discrete transistors, the MC3479, L297/L298 and the IMT901. The IMT 901 was much better, because of the simple layouting and connecting, high possible currents and frequencies and microstepping ... Actually there are better driver-chips, some with up to 1/128 microsteps, but i agree, that the design should avoid SMT and higher complexitiesvon VDX - Controllers
Complex LOM-Objects made from laminated steel - 17 Jahre zuvor
... in the appended image is a sample of a LOM(Laminated-Object-Modelling)-housing, i stacked with lasercutted 0,1mm steel-sheets. The housing is 3x2 millimeters big, has 6 slices and two troughputs for glass-fibres. I made this as a prototype for a ultraprecise fiber-sensor/switch because of the high-temp form-stability of tempered steel (the milled PEEK-housing, which was used before, was to ivon VDX - Mechanics
Re: Arduino as simplified comm/controller board - 17 Jahre zuvor
... some years ago i developed on my own microstepper-drivers with the IMT901 for driving a laser-cut-plotter and have some prototypes of single-chip- and two-chip-boards with latches for my part ... But as i mentioned in the posting above, for others the ready-to-use module SMC11 ( ) from nanotec could be the easier alternative. A single one costs 29von VDX - Controllers
Re: Beaded belts - 17 Jahre zuvor
... the beaded strings of jalousies would be fine ... For selfmade-types i think on two halfs of aluminium with 5 or more milled halfspheres (one half with holes for injection-molding) and a v-grove through - then inlay the string, close the halfs and inject hot plastic in the drilled holes, until the spheres are filled. Let it cool down, open the halfs and shift the string, so that one bead isvon VDX - Mechanics
Re: Support material header - 17 Jahre zuvor
Hi Russ, what about wax? It's cheap, doesn't need so high temperatures (e.g. lowtemp-wax) and is easy to remove ... Some synthetics or vaseline can be used too - then it's maybe easier to cool down the apparatus, for stiffening the support material. With releasing to room-temperature it goes liquid again ... Ciao, Viktor *** appended *** ... gelatine culd be a try too - it's easy to liquidvon VDX - General
Re: Reprapping Engines - 17 Jahre zuvor
Hi rmadams, i'm glad to help you Why not playing around with plastic-made steam-engines? There are people, which 'reinvented' micro-steam-motors for MEMS, and with the same approach - plastic-membranes, -pistons and with ferrofluidic isolation i can design resizing chambers and with heating resistors and aether or other lowtemp-boiling fluids i can build a room-temp-steam-motor from molded plvon VDX - General
Re: Magnetic joints and selfassembling ... - 17 Jahre zuvor
Hi lordcat, look at the image 'Tripod-2.jpg' ( ) at Here you have a reprapable 'one-sheet' body, which contains all the mechanical stability, the flexure hinges and the feeding. You need only the linear drives and the tool-head ... Until the reprap is capable of printing the hinges (minimum 0,1 micron accuracy), i have to glue thin pieces of superelastic nitinol or springy steelfoil as hingvon VDX - Mechanics
Re: Magnetic joints and selfassembling ... - 17 Jahre zuvor
Hi Zach, here you have an example of hexapods and tripods for CNC-systems with some basics and formula for converting ... I think, with an easy to assemble (because of magnetic selfassembly) and reliable mechanic for a 3-axis-system we can go deeper in the development of the software, which is free of charge then. With 3 linear stepper-drives and controller-modules from nanotec and all the pavon VDX - Mechanics
Re: Future Feature Idea: No PC printing. - 17 Jahre zuvor
... on one of the sides you need a computer capable of slicing the STL-data in path-informations for the XYZ-stages and the dispenser. Either you convert on a desktop-pc the STL-file in ncp- or G-code (or whatever the reprap needs), then you receive for a 'typically' 3D-object with 0,1 mm resolution many hundred megabytes of code ... Or you transfer only the STL-code and/or the corresponding invon VDX - Controllers
Re: Future Feature Idea: No PC printing. - 17 Jahre zuvor
Hi mimarob, ... but you need a computer in your reprap, which can read the USB-stick or SD-dard ... I asked previous, why not use PDA's or smart-phones? Maybe in third-world countries the smartphones are more distributed, than capable PC's? Then a reprap without an own computer, but with an USB- or Bluetooth-Interface, which goes directly to the motor-drivers and a smartphone with the softwarvon VDX - Controllers
Re: Salvaging parts - 17 Jahre zuvor
... i extracted some very strong 200-steps-motors from NEC-Needle-printers and HP-Inkjets form the early '90-ths and smaller qubic-shape motors from old floppies and hard-drives (very, very old, out from the MFM/RLL-age ) The oldest 5-volt 200-step-motors i found im IBM-card-readers and -printers. *** appended *** I sneaked through my scrapery in the cellar and found some very old XY-writersvon VDX - Reprappers
Re: Support material header - 17 Jahre zuvor
Hi Russ, ... it seems, that i have an 100%-dexpanthenol without water in it, when i have it open over weeks, it didn' dry out and i didn't know, if it's hygroscopic ... It's very adhesive and have an extremely high viskosity, nearly like toothpaste - it flows much slower as honey, but it flows and forms a perfect droplet with a smooth end-surface. I use it as solvent for heavy powders like golvon VDX - General
Re: Support material header - 17 Jahre zuvor
... i used dexpanthenol for manually dispensing of very small droplets (~60 microns) of glass-powder or a mix of eutectic gold-soldering powder with plain gold-powder in 1micron-size. The paste must preheat and the dexpanthenol have to vanish completely, then i can fire and sinter until 1000von VDX - General
Magnetic joints and selfassembling ... - 17 Jahre zuvor
... hi folks, i sort of invented a self-assembling-mechanism for macroscopic joint-structures and flexure hinges, as known in flex-joint parallel kinematics. In the image below you can see a tripod-sample with this joints, i 'assembled on the fly' in two minutes - if i set it on three linear drives, then the fully functionable tripod-system for reprap-dispensing or micro-tooling is ready Thevon VDX - Mechanics
Re: Reprapping Engines - 17 Jahre zuvor
... here i have a link (site in german) to a stirling-engine made of sheets of paper, aluminium and membranes: ... here the video of the paper-stirling on a hot coffee-pot: (it runs on ice-blocks too) ... and here the manual and technical description in english: So you can adapt and print the parts and assemble them to a running engine ... Ciao, Viktorvon VDX - General
Direct linear actuators with 1 micron accuracy - 17 Jahre zuvor
... maybe it's interesting, to use direct linear drives for X, Y and Z instead of gears and belts? At www.nanotec.de i found some with an step-resolution and accuracy of 1 micron (or a bit coarser and cheaper) - Low-cost-linear steppers (25 or 40 microns resolution) are at nearly 30von VDX - Mechanics
Re: Arduino as simplified comm/controller board - 17 Jahre zuvor
... i had very good experiences with stepper-motors and motor-controllers from Nanotec (www.nanotec.de) The microstep-controlers costs 30von VDX - Controllers
Re: RepRap Self Miniaturization thought - 17 Jahre zuvor
... as i posted in 'Mechanics': *** ... what about a 'lego-like' pick'n-place-approach? I imagine a vacuum-dispenser, which grabs very small pre-fabbed bricks or balls from a support and places them on the right place ... This 'bricks' could come from a sort of magazine, or from a conveyr-belt, on whom a fixed dispenser places single dropplets in the right size ... Maybe instead of simple drovon VDX - General
Re: granule extruder - 17 Jahre zuvor
... what about a 'lego-like' pick'n-place-approach? I imagine a vacuum-dispenser, which grabs very small pre-fabbed bricks or balls from a support and places them on the right place ... This 'bricks' could come from a sort of magazine, or from a conveyr-belt, on whom a fixed dispenser places single dropplets in the right size ... Maybe instead of simple droplets there could be more complex forvon VDX - Mechanics
Re: Reprapping Engines - 17 Jahre zuvor
... until yo have no tools for sintering high-temp or applying bulk metal or ceramics, i would try 'organic-style' devices with membranes and pistons. Some folks in Bremen university designed and build micro-grippers with an included hydraulic/pneumatic membrane-actuator, which was driven by heating resistors ... I used special ferrofluids as magnetically controlled actuators and used them toovon VDX - General
Re: RepRap Self Miniaturization thought - 17 Jahre zuvor
Hi Sean, ...there's a lot of work to do, until i can 'print' chips and advanced elektronics, but this is my idea Actually it's easier to print conections and vias with conductive paste and insert 'normal' chips. 25 years ago i made outline-pcb's with my Atari ST and a $2000-mill. Maybe with an acid, which will proper remove copper, but not the inc-jet-guts i can make the same with an inc-jetvon VDX - General
Re: Support material header - 17 Jahre zuvor
... i had to mix some glass- and gold-powder with a liquid to a dispensable paste. So i found out, that i can have a high variable and fine adjustable viscosity, if i use either pure dexpanthenol (eq. D-(+)-Pantothenylalcohole) or mix it as needed with water. Dexpanthenol didnt dry, but with heating i can remove it completely and sinter the formed volume to the endstate - glass-soldering (~430von VDX - General
Re: Future Feature Idea: No PC printing. - 17 Jahre zuvor
... why not use PDA's or smart-phones? Then you need only an USB- or Bluetooth-port and the software runs as native java or C on the handheld ... The actual smartphones or pda's are 'real' capable Hardware and should be much faster with more RAM in the future. Ciao, VDXvon VDX - Controllers
Re: RepRap Self Miniaturization thought - 17 Jahre zuvor
Roach_S Wrote: ------------------------------------------------------- > Ohhhh....chip manufacture.... > > I want a sub-micron silicon etching head... Hi Sean, ... the OLED-technology plays with ink-jet-printing of polymers and solvents for additive and/or subtractive manufacturing of organic and anaorganic electronic - here you have a dot-size of merely 30 microns ... On the othervon VDX - General
Re: RepRap Self Miniaturization thought - 17 Jahre zuvor
... oh, this wasn't my money burnt here I'm in the development of microassembly tools and integrating of nano- and micro-parts in 'real' applications ... The expensive parts runs mostly with projects and cooperations. On my work i have an (lowcost, ~8000von VDX - General
Re: CAD software? - 17 Jahre zuvor
ZachHoeken Wrote: ------------------------------------------------------- > wow, those are awesome! ... thanks They are for the 'normal' dimensions - in the other work with a bit more accuracy i handle platinum wires with 0,001 mm diameter and actualy i 'tune' prober-needles with nano-tips, where i have to fix a gold-knob with merely 30 microns diameter and a sharp tip of nearly 20 nanometevon VDX - RepRap Host
Re: RepRap Self Miniaturization thought - 17 Jahre zuvor
... here i have an image of an milled 'one-sheet-tripod'-system settled on an array of pzt-linear-motors. This system is capable of some centimetres way in X, Y and Z with an accuracy in the submicron range. The image of the 'black beetle' is an example of an 'sticky' hexapod ... The tripod-mechanic is very easy to design and to build, so the overall assembly reduces to a basis with 3 linearvon VDX - General
Re: CAD software? - 17 Jahre zuvor
... here i have some images of designing micro-tools and ready ones in STL-epoxy or milled from DELRIN or aluminium ... Ciao, VDXvon VDX - RepRap Host