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Support for the quite nice RAMPS Electronics. See also http://reprap.org/wiki/RAMPS.
Other heatresistant materials - 15 years ago
Hi all, ... for housing and embedding high-temp-sensors i searched methods and materials, that can be milled and withstand temperatures over 500by VDX - General
Re: Extruder Rate (request for crackpot ideas) - 15 years ago
Hi Bob, ... for 3D-fabbing "Tea, Earl Gray, hot" you mustn't wait 300 years: Imagine a Darwin-two-head-extruder in a refrigerator-housing - one head extrudes a cooled ceramic-paste for the cup-slices and the other extrudes frozen Earl-Grey to form the 'Tea'-slices ... When ready after some hours put it in a microwave-oven, heat it until the ceramic sinters and the tea boils - voilby VDX - General
Re: Furfuryl Alcohol resins - 15 years ago
Hi Fernando, ... i experimented with Natron-waterglass for ceramic-like solids - it's a longer way then planned, as i didn't get the wished materials in time ... Today i experimented with materials i found in my basement and found some, that can work as support for extruding overhangs - all products stay brittle with a not so strong contact to the surface, so easy to remove ... 1. waterglass wby VDX - Polymer Working Group
Re: Servo motor VS Stepper motor - 15 years ago
Hi Joe, ... i worked over a long time with steppers in my different CNC-mills and in some homebrewed and a 'professional' laser-plotter i developed some years ago - with the right 'overdesigning' of the steppers (as made in most systems on the market) there is a fair range of possible speeds and loads, until the system begins loosing steps. With my actual CNC-mill-repstrap i run in halfstep (iby VDX - Mechanics
Re: Inconsistent actualisation of the posts ... - 15 years ago
... yes, i figured this out with the local groups - when visited, then the counter runs correct ... Viktorby VDX - Administration, Announcements, Policy
Re: Dot printing rather than Extruding? - 15 years ago
Demented, ... not the calculation is the bottleneck, but the extruding-time of the volume ... AFAIK the actual host-software does already patterning the inner volume - here you can win nearly 50 to 60 percent, as you extrude only every second or third line ... But with 'cutting-only' the contour-outlines you can ignore the complete inner volume, what's thousandfold faster with micron-accuracy,by VDX - Reprappers
Re: Servo motor VS Stepper motor - 15 years ago
... in my old CNC-mill-repstrap i have ball-screws with zero backlash, so it's good for milling with higher speeds and forces and massively overdesigned for 'only' driving the extruder- and laser-heads (but i use it as mill too, so it' no problem ). The only pain is the main-screw, which seems to were driven without proper lubricating and with a much to high compressed ball-screw, so it have noby VDX - Mechanics
Re: Reprapable linear drives ... - 15 years ago
... for induction-driving without magnets: - the common toothed rods can be found as "rack and pinion"-setups. When using the rack-teeth instead of magnet-poles, it's the same as with non-magnetic stepper-motors - the active coils 'snap-on' at the nearest tooth, so with more slightly displaced racks and fitting coil-arrays you can build the same fine-moving linear motors as with the magnetic setby VDX - General
Re: Servo motor VS Stepper motor - 15 years ago
... for my Tripod-linear-drives i made blocks from PTFE (Teflon) with M5-threading, what seems to work very good without lubricating - it's a bit tricky to adjust the grip/play of the threading, as the PTFE is a bit elastic when tapping ... Viktorby VDX - Mechanics
Re: Plasma Cutting - 15 years ago
Hi Andy, ... i recently made some experiments with a micro-WIG-plasma-system (WIG = TIG) for welding small steel-parts with 0,1 mm accuracies and lower ... The particular system ( ) is capable of plasma-cutting too, but it's much more injected energy and spot-size, as i imagined by 'micro-plasma-welding'! So we stay at laser-welding for our parts ... Viktor *** Edit: for micro-gas-cuttingby VDX - RepLab Working Group
Re: Beads rather than belts? - 15 years ago
Hi Russ, ... look for ready made beaded wires as used in window-rollos. The connecting to a loop can be made with cast-molding the two ends with a molded bead ... Viktorby VDX - Mechanics
Re: Reprapable linear drives ... - 15 years ago
... here an update: The guys at Supermagnete.de didn't sell powder, VAC didn't want to give their parts away, so i actually didn't find usable NdFeB-powder, but will try further ... For a selfmade approach there could be made some hard-magnetic powder by chrunching down big magnets with a ball-mill or try to find ready NdFeB-resin-strips (should be silvery-coloured instead of brown-black as witby VDX - General
Re: RepRap forum organization - 15 years ago
... with some evolution in compilers and hardware-capability the developing of software should change to a self-optimizing path with self-evolving algorhytmics ... Maybe some of you remeber the 'Meme-volution', where a japanese professor tried to use an open-source-approach and the time/interest-span of users to evolve sniplets of code like genetic information to evolve software over time and elby VDX - General
Re: Dot printing rather than Extruding? - 15 years ago
Hi Demented, ... my '3D-points' are the representation of the smallest units of the object - with a 1mm thick tray it schould be something like a 1x1x0,7mm cubicle (length x width x height) ... So it's obviously, that with a 0,5mm thick tray you have 0,3 to 0,4mm thick slices with 0,5 mm distance between the trays, so you can calculate the amount of '3D-points' per slice. If i want to reduce tby VDX - Reprappers
Re: Dot printing rather than Extruding? - 15 years ago
Hi Demented, ... it's your decision: - (very!) fast'n'easy or slower with a complexer toolhead. The main problem in 3D-printing is the fabbing-time. If it's no problem for you, wait many hours to days antil your part is finished, it's OK ... I think around how i can reduce the fabbing-time drastically but enhance the accuracy too! Most of the 3D-printers have to process every 3D-point of thby VDX - Reprappers
Re: Dot printing rather than Extruding? - 15 years ago
... i would use a head with more vacuum-dispensers (like a star with 4, 6 or more dispenser-needles) Gripping a ball: - the actual dispenser activate vacuum an dive into the ball-support, until a pressure-sensor measure that the dispenser is blocked. With small balls the vacuum can be switched off, as the balls stick with adhesion to the dispenser-tip. For the heating: - either heat the dispensby VDX - Reprappers
Re: First RepRapped RepRap? - 15 years ago
... i'm a real fan of 'organic designs' - imagine a halfsphere from resin, which consists of several separated inner sectors, that can be pressurized and evacuated through valves. When you set a tool on top of this, you can very precise move and point the tip in different directions ... With other designs you can perform more travel-range, higher forces and accuracies and build objects, that caby VDX - General
Re: First RepRapped RepRap? - 15 years ago
Hi Joe, ... i think, ready manufactured copper-wire should should be alowed to use for a reprap Here i discussed a linear stepper motor, that could be self-made from iron-bolts and copper-wire for the coils. Some other sophisticated parts (screws, nuts, ...) are also easier to make in a different process, so it's a fuzzy definition, what's a core-reprap and what's a repstrap ... When pointiby VDX - General
Re: First RepRapped RepRap? - 15 years ago
... as long, as you can't fab the bed, the struts, all feedings, belts and especially the electronic and motors, ist's mainly a repstrap - Darwin and Mendel are assembled of metal-parts with many components as screws, connectors, cables and other stuff, you buy ready from shelve elsewere ... I think the first 'real' RepRap would be something pneumatic or hydraulic with heat- or pressure-morphedby VDX - General
Re: Simple STL-files for testing dimensions - 15 years ago
... please give me feedback for the accurate dimesion, so i can calibrate my dimensioning befor output STL-objects (as i mostly measure and construct in microns ) ... Viktorby VDX - Let's design something! (I've got an idea ...)
Re: PCB Production - 15 years ago
... when in 1986 i got my first CNC-mill, the first try was to go away from etching PCB's - so i hacked a program on my Atari-ST, which could scan for lines in Bitmaps, make contour-outlines and export them as HPGL. Then i made a driver for the mill, which milled the HPGL-files - this were fine outline-insulated PCB's with big copper-areas between the tracks. For double-sided PCB's i manually dby VDX - Mechanics
Re: Servo motor VS Stepper motor - 15 years ago
Hi Ian, ... AFAIK this +-5%-inaccuracy is the 'springy' area, the magnetic fixed rotor can be moved with changing load or tangential forces on the shaft. So it's on the design and the right torque-selection to compress the error-range ... When you do microsteps, then you have this 'springy' area around your microstep-positions too, so when you have a setup with constant load, then you can measby VDX - Mechanics
Re: Scaling Down - 15 years ago
Sean, ... should be possible - print a paste with a very high amount of solvent, print with a second dispenser a paste on top (and/or vice-versa for multilayers) which didn't shrink, then separate from the bed and let it dry or heat it up to evaporate the solvent. I had shortly a similar problem with soldering glass-powder ad waterglass+water as solvent - when dispensed it was good, when firingby VDX - General
Re: First RepRapped RepRap? - 15 years ago
... i have first to bring my repstrap to full functionality - it's a big CNC-system designed for professional milling (costs new something about 4 - 6000Euros or so and was used as glue-dispenser), so i'll order a better mill-head first. With the freedom to make all my parts at home i can do anything i want, as the system is capable to handle wood, plastic, aluminium, brass and can do PCB-engravby VDX - General
Re: Ultimate Rep Strap - 15 years ago
... printing unfolds from imported STL-objects with pepakura is possible without registration, but you need it for exporting in other formats and saving your changes in the PDO-file ... When i'm working with milling, then i didn't want the glueing supports, so i'm searching an alternative, which should outputs vector-paths (HPGL would do for example) too. AFAIK some CAD-programs (for sure Amapiby VDX - Mechanics
Re: Optical position measurement - 15 years ago
Hi Demented, ... the 'normal' mouse-driver isn't so accurate and loose steps over the travelling range, so you have often to recalibrate your position. The idea was to use the mouse-sensor as 18x18-pixel-camera and extract the outlines and moving of the lines on the ribbon wit ImageRecognition-software as error-resistant position-info ... Viktorby VDX - Controllers
Re: Ultimate Rep Strap - 15 years ago
Hi aka47, ... you need two synchrone scissors for good accuracy, they aren't linear and the load-stability is different in height, so the screw-drive-elevator is actually the better alternative. --- By the way: look at the appended image - i constructed a simple L-shaped test-object with holes, exported it as STL and imported and unfolded in pepakura-designer. Actually the designer can only pby VDX - Mechanics
Re: Ultimate Rep Strap - 15 years ago
... i have to wait until January with the next massive orders, as my actual private limit is reached ... But some infilled sheet-work is possible, so why not experiment with this idea? As printing a complete 3D-object with high accuracy is heavy time-consumpting, so why not print only 3-layered surfaces (1 layer for the hinges, 2 additive layers for stiffness of the side-parts) or mill from thby VDX - Mechanics
Re: Dot printing rather than Extruding? - 15 years ago
Hi Adam, ... with 'dot-printing', 'polymer' and 'heating' i think on a print-head, which didn't extrude drops from a continuous stream, but place little polymer-balls, which are hard when picked up, then heated up and placed as melted droplets ... Think on a support of small polymer-balls, from which a pick'n'place vacuum-dispenser takes ball after ball, heat and insert them in the next point-pby VDX - Reprappers
Re: Ultimate Rep Strap - 15 years ago
Hi aka47, ... i knew some german metall-etching companies, which make similar 3D-objects from flat metal-sheets. Look here: - with the papercraft-designer you can convert a 3D-STL-object in a paper-modell for cutting and folding. When you mill the outlines with a CNC, then you can make the same from thin aluminium-sheets, so you can fold them to 3D and infill with polyfilla, plaster or similaby VDX - Mechanics