... it's really that simple ... the only limitation is the variable-size for the data containing the actual position. When moving/positioning with an stepsize of 10 microns and using long Int you have a max. linear count of 4.63 kilometers per axis A much more serious problem is the possible speed - imagine an object of 1x1x1m size printed with an accuracy of 0.1mm (not really fine ) with a favon VDX - General
Hi John, ... good findings The motors should be enough for a small CNC-machine - you can measure the resistance of the coils for first estimates of the support-voltage. Encoder could be usefull too ... if not, then you have a second shaft Viktorvon VDX - Mechanics
... with so big steps it's a problem with speed and resonancy-errors My CNC-mill has 0.025mm at fullstep and then max. 2000Hz without load, so a max. speed of 50mm/s ... with halfstepping i can go until 6kHz freerun, so max. 75mm/s, but sometimes with stepping errors too I have direct-coupled motors, the Mario robot toothbelts, what's more damping, so maybe some more speed too, but for whatvon VDX - Mechanics
... this seems to be really fast - maybe wrong? My (max. 10kHz) microstepping drivers manage 50mm/s with halfstep@4kHz (errors when faster ) on a 5mm/rev spindle ... then 31.25mm/s with 1/8 microstepping@10kHz and even slower when higher microstepping (but with higher accuracy ) Next tim i'll receive some 200kHz- 1/50-microstepping drivers with corresponding motors - then i'll estimate nearly 1von VDX - Mechanics
Hi all, look into the documentation of a comercial paste-dispensing 3D-roboter: It's an extreme simple setup but has a price of 5000 Euros Anyway ... it's much lower parts count, than any other actual system Viktorvon VDX - Mechanics
... it's not really that simple I've some steppers (uni- and bipolar) with 24Volts@0.2Amps in contrary to steppers with 1.2Volts@3Amps. For driving with a simple discrete h-bridge (2 transistors per coil) the 24V@0.4Amps are better ... but when you're driving with a modern IC you nvon VDX - Controllers
Hi Nadir, ... have you converted your model to triangulated surface (so any polygon is cut into aligned triangles)? AFAIK this was a common Error when exporting from programs like Lightwave or older 3DSMax versions ... Viktorvon VDX - RepRap Host
... frag mal bei RepRapSource nach: Viktorvon VDX - Altes Forum
I made some experiments with paste-dispensing and printing/sintering interchanging layers of ceramic and gold. The ceramic-slurry was mixed from micron-sized ceramic powder and waterglass, the gold-paste was a mixture of eutectic gold-tinn-alloy spheres (30 microns, 80% Gold 20% Tin), 1 micron sized gold-dust and Dexpanthenol. I presintered the layer with a 4Watt-diode-laser and cured the complvon VDX - General
... look at the last image in this PDF - a perfect method for making 'endless' belts with any size ... Viktorvon VDX - Mechanics
... look at Caligaris Truespace - it's now for free (until Microsoft smash it completely down): I'm constructing 3D-parts with high complexity for micromechanics with Lightwave - and for solving some specific problems, sometimes with 3DSMax. Most 2D, 2,5D and 'simpler' 3D construction is made with IsyCAM suited best for my Isel-CNC-mill. You have to look at your aims - best 3D-working is withvon VDX - 3D Design tools
... oder bestell dir den Arduino oder den Mega bei RepRapSource oder Watterott - knapp über 20 Euro für den Arduino bzw. etwas über 50 Euro für den Mega könnten noch drin sein und sollten dir erstmal über die Wartezeit hinweghelfen, bis Iain in die Gänge kommt. Bei mir liegt ein Mega und zwei MySmarts168 herum, bis ich die anderen Baustellen soweit fertig habe - aktuell haben Dach dämmen, Weihnavon VDX - Altes Forum
Hi Bo, you know about BitsfromBytes in England ( ) and RepRapSource in Germany ( )? Viktorvon VDX - Reprappers
... online-position-feedback should solve most issues with sagging. I was thinking about applying rotary encoders and some wires as in my string-tripod Alex Jonis Toy ( ) for triangulation of the toolhead - so with cartesion or angular positioning you can measure the position of the toolhead regardles of structural or other displacement ... Viktorvon VDX - General
... wouldn'last very long Better print a mould and make some from silicone/rubber with embedded steelwires or such ... Viktorvon VDX - Mechanics
... this 'position-depending sag' could be solved by a calibration-matrix when the sag ist the same in every specific position - run a measuring job over the working area and add/subtract the measured disposition ... Viktorvon VDX - General
... very interesting are electro- or magneto-rheological fluids and maybe mixtures of oils and ferrofluids too - imagine magnetic stall- and direction-management or magnetic valves and oszillators for fluids ... Viktorvon VDX - Plastic Extruder Working Group
Hi Dave, i tested FreeCAD some time ago and found it usefull, but like many other i'm working mostly with other CAD/CAMs (some proprietary, some free too) suited for my CNC-mill and methodics ... Viktorvon VDX - RepRap Host
... when used with FDM you can't work with the plastic versions For the same reason i mentioned luer lock adapters made from steel or fixing nuts on a brass-tube. Another interesting source are the nozzles from micro-plasma-welding - they're made from copper, have a common thread and inner diameters down to 0.1mm ... the drawbacks could be the price for single counts or the high thermal mass .von VDX - Mechanics
Hi Lawrence, ... for designing and milling complex and high precision parts for micro- and nano-mechanics (accuracies down to 10 nanometers ) i used Lightwave. Actually you have a good entry with Truespace ( ) - it's free and capable of much more than 'simply constructing' Microsoft purchased Calligari and give Truespace away for free but it's only short time until they shut it completely dvon VDX - Plastic Extruder Working Group
Hi Dani, ... mail doch Iain mal an - soviel ich weiß, wollte er die Firmware irgendwann als OS freigeben, ansonsten kann er dir auf jeden Fall weiterhelfen ... Viktorvon VDX - Altes Forum
Hi Dani, ... zu der Software müßte es eine Dokumentation geben - das Anpassen der Schritte pro Umdrehung pro Millimeter Vorschub ist eine der Grundoptionen der RepStraps und sollte auf jeden Fall irgendwo einstellbar sein ... Viktorvon VDX - Altes Forum
... bearings made from sinterted steel-powdervon VDX - Plastic Extruder Working Group
... i tried with high viscous fluids (nearly like tooth paste) and even thinner needles (until 0.1mm outer- and 0.06mm inner diameter). I had to cut the needles complete down and still had some issues with viscosity. As friction is even more a problem with molten plastics you should try with thicker needles cut short. For adapting the needles you have to use Luer-Lock-adapters from steel or yovon VDX - Mechanics
Hi Erik, ... then you have to raise the ambient temperature - best by enclosing and heating your build area ... it's a problem/option discussed every oncevon VDX - Skeinforge
Hi Lars, ... ich habe bisher nur mit flüssigen Pasten bei Zimmertemperatur oder Thermoklebern bei 80°C gearbeitet, da klebt's auf fast allen Oberflächen gut. Je nach Kunststoff kannst du ein Platte aus dem gleichen Material nehemen - für HDPE z.B. Küchen-Schneidbretter ... Viktorvon VDX - Altes Forum
Hi NeL, ... vermutlich zu geringe Temperatur. Um gut zu haften, muß die neue Spur noch genug Hitze übertragen, um die darunterliegende Oberfläche anzuschmelzen - bei den meisten Kunstsstoffen reicht ein 'Ankleben' nicht aus ... Viktorvon VDX - Altes Forum
Hi Eric, i downloaded Caligaris Truespace 7.6 from here: It's free now and fully capable of really sophisticated 3D-construction, -artwork, physics and others - and it imports/exports different 3D-formats including STL. Since the site is intended for shutdown soon, you should download the install-files, the manual and the tutorial videos - it's real worthy I have it installed and running -von VDX - RepRap Host
Hi Eric, i downloaded HeeksCNC some time ago and run a short test, but until now my toolchain is based around IsyCAM. When changing to Arduino-CNC and LOM then i have to try with other solutions too ... Viktorvon VDX - RepRap Host