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Support for the quite nice RAMPS Electronics. See also http://reprap.org/wiki/RAMPS.
Parallel-kinematics versus string-pod - 15 years ago
... as with the tripod-structure from the thread "Magnetic joints and self-assembly..:" there could be constructed several 3-axis-systems with different approaches, here for example with wire-feeding over fixed rolls. In the appending image i have a concept of a 'stringy tripod', which has only 3 gliders as moveable parts, which can be moved throug beltdrives or linear motors. The toolhead canby VDX - Mechanics
Re: Digitizer-tablet for XY-measurement ... - 15 years ago
... at home i checked the tecspecs of my old 'Summasketch III Professional'-tablet: - active area = 12 x 18" or 305 x 457 mm - resolution = 2540 lines per inch or 100 lines per millimeter (=10 micron) - accuracy = 0,010 In or 0,254 mm ??? The tablet has a stylus and a 4-button-mouse, which would do better. (I found an Aiptec-HyperPen-tablet too, but the active area is only 10 x 12,5 mm and the sby VDX - Mechanics
Re: Article on Home Rapid Prototyping - 15 years ago
... as appendix to the discussion with my 9-years old son, what to do with a reprapper, we found some very expressive samples. One is building separable slices of a human body with coloured inner parts from gelatine (slices separable with sheets of wax-paper). The other project would be a birthday-cake in form of a castle with interieur and some action-figures, made from chokolade, melted shugaby VDX - General
Digitizer-tablet for XY-measurement ... - 15 years ago
Hi folks, ... an idea for easy reading the absolute coordinates of the XY-motors or of the tool-head absolute position in general ... If someone has an old digitizer-tablet (best an inductive with crosshair-mouse) laying around or can buy it cheap at ebay or so, then it's worth trying, if it could be fixed under the reprap and the digitizer-mouse mechanically syncronized to the moving reprap-heby VDX - Mechanics
Re: Article on Home Rapid Prototyping - 15 years ago
... for building fitting lego-bricks you need an accuracy near to 10 microns, but the problem is more the material and the smooth surfaces, you need ... My prototypes and giveaways from commercial high-end 3D-printers have accuracies from 0,2 to 0,01 mm (STL-epoxy), but none of them is capable of building 'real' lego-bricks, because of the surface-finishing or the durability of the material. Onby VDX - General
Re: Complex LOM-Objects made from laminated steel - 15 years ago
Hi mimarob, ... for bigger objects i can cut thicker sheets, so the amount of stacking is variable. Maybe in coarser regions without overlapping i use 1 millimeter and in finer segments 10 micron thick laminates ... The slices are cut out from the sheet and laminated/stacked one after the other. For high accuracy in the slices are fitting-holes, in which i insert small sticks - e.q. 0,3 mm thiby VDX - Mechanics
Re: Beaded belts - 15 years ago
... yes, it's limited of free length, but why not fixing the z-bed directly to 4 vertical steel-strings, which comes from two closed loops, that runs over a single motorized roll, instead of 4 screws which are synchronized with a (bit more elastic) belt? In the plotter i drived with 2 stepper-motors (which sat on the same plate) two wire-loops, which moved the rail (in X) and the toolhead (in Y)by VDX - Mechanics
Re: Beaded belts - 15 years ago
Hi mimarob, ... you can make a slip-free system without gears or beads. I build my first penplotters with 0,5 mm thick steel-strings over rolls, i made from plastic-coated ball-bearings, in which i lathed a v-grove. Two steppers drived bigger rolls, over which i had 2 to 4 rounds of the string and at one end i had screw-spanners (?), which apply some amount of stiffnes in the loop ... There wby VDX - Mechanics
Repository of mechanics and technical samples - 15 years ago
... here the link to databases with mechanical stuff, which is interesting for some mechanical ideas: There are downloadable STL-files for the parts , so people would be able to reprap examples and play around with technical questions ... Maybe we should start with a similar CAD- and STL-database too? Viktorby VDX - General
Re: Article on Home Rapid Prototyping - 15 years ago
Hi reece, ... yesterday i had a short discussion with my 9 years old son, what he would do, if we would have a capable reprapper. He grumbled a bit, then said, he would build lego-bricks for his actual favorite sites, or maybe a cool shaped pencil-sharpener ... Then i self thought around, what sort of needs i have. It sorted out, that my home-reprapper must be able to build with thermoplastiby VDX - General
Re: Arduino as simplified comm/controller board - 15 years ago
... here are the data-sheets of the IC's with connection diagrammes ms3479p: IMT901: [1].pdf Viktorby VDX - Controllers
Re: ALTERNATIVE SOURCE FOR MAGNETIC SHAFT ENCODERS - 15 years ago
Hi Jono, ... i played around with web-cams and encoding positions with open-source image-recognition. The normally used optics allows absolute resolutions down to 5 microns, if you revert the objective. For another approach i tried 3D-measuring with a single camera-chip without lenses, a LED and two metallic sieve-sheets - with interpreting the moirby VDX - Controllers
Re: Article on Home Rapid Prototyping - 15 years ago
... thank you very much, a very interesting discussion! On the other side i wondered too, why reprap and [email protected] wasn't more cooperative ... I found [email protected] first, then some weeks later reprap - now i'm focused on reprap, because of the a bit more active comunity and distributed ideas, i can test or dispute with others (and because it's not so US-centered ) For me the basic-concept and hardby VDX - General
Re: Complex LOM-Objects made from laminated steel - 15 years ago
Hi Zach, ... i was playing with rapid prototyping since nearly 30 years, but then the CAD- and encoding-software wasn't really capable and i had to sell my 3D-mill in exchange for other ressources ... With first attempts in CO2-laser-cutting with a 'cheap' gaslaser for 1.500 DM i invented the LOM-technique for me in 1989 or so, but it wasn't so easy to earn enough money with the selfmade systemby VDX - Mechanics
Re: Arduino as simplified comm/controller board - 15 years ago
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 complexitiesby VDX - Controllers
Complex LOM-Objects made from laminated steel - 15 years ago
... 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 iby VDX - Mechanics
Re: Arduino as simplified comm/controller board - 15 years ago
... 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 29by VDX - Controllers
Re: Beaded belts - 15 years ago
... 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 isby VDX - Mechanics
Re: Support material header - 15 years ago
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 liquidby VDX - General
Re: Reprapping Engines - 15 years ago
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 plby VDX - General
Re: Magnetic joints and selfassembling ... - 15 years ago
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 hingby VDX - Mechanics
Re: Magnetic joints and selfassembling ... - 15 years ago
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 paby VDX - Mechanics
Re: Future Feature Idea: No PC printing. - 15 years ago
... 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 inby VDX - Controllers
Re: Future Feature Idea: No PC printing. - 15 years ago
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 softwarby VDX - Controllers
Re: Salvaging parts - 15 years ago
... 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-writersby VDX - Reprappers
Re: Support material header - 15 years ago
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 golby VDX - General
Re: Support material header - 15 years ago
... 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 1000by VDX - General
Magnetic joints and selfassembling ... - 15 years ago
... 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 Theby VDX - Mechanics
Re: Reprapping Engines - 15 years ago
... 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, Viktorby VDX - General
Direct linear actuators with 1 micron accuracy - 15 years ago
... 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 30by VDX - Mechanics