... think of security! -- you handle here with invisible radiation, which even unfocused is strong enough to cause severe damage on the skin and especially in the eyes!!! Even the 'weak' IR-LD's from salvaged DVD-RW-drives with up to 220 Milliwatts are strong enough to cut through plastic, so be extreme carefully, when testing or using LD's. You can buy special goggles for every wavelength, butvon VDX - Laser Cutter Working Group
Hi Nighthawk, ... very impressive - the design isn't really selfdocumenting, but you can build a nice chess-family around the part as 'king' Viktorvon VDX - 3D Design tools
... i actuall have a similar "NoClassDefFoundError" in javax/vecmath/Tuple3D in Windows XP on a dual-core-Intel ... At home with WinXP-home and the same install i finally managed to bring it to work after updating my OpenGL-drivers for the Ati-Radeon-Mobile9600 graphics card on my notebook ... Viktorvon VDX - RepRap Host
Hi Ian, ... here is the vendor: ... and here the 8Watt-diodelaser: Viktorvon VDX - Laser Cutter Working Group
Hi Assargadon, ... look at the behaviour of low-cost CNC-systems with manually or semi-automatically changed mills: With every mill-exchange you have another 0-position, so the home-/limit-switch is 'on the other end' - eg. the limiter is activated, when the reprap-base-plate is at the absolute bottom ... For determining the 'workpiece-0-position' you move the toolhead/base manually to a reprevon VDX - General
... ... What's with 3D-fabric? Viktorvon VDX - General
... yesterday we tried it ... I heated 500 ml milk short before boiling and poured a spoon of vinegar-conzentrate into - very fast separation of curd and whey. After filtering we got nearly 200 grams of 'farmers cheese' - it taste as cheese too, but a little poor without salt Then we pressed the water out and inserted the stuff in some play-doh-mold-forms. I tried with a milled counterform fvon VDX - Polymer Working Group
... best way for collecting low-concentrated gases like CO2 or methane from air is filtering in 'bio-filters' with algae or bacteria in water or in a big greenhouse with fast-growing plants as reeds or special C4-plants. Then convert the bio-stuff in a high-pressure temp-curing process with citric acid as catalyst to pure carbon and water or a fractionable oil-basis. This would be some bigger,von VDX - Let's design something! (I've got an idea ...)
... because pure carbon is the ever best (ultra-strong and hyper-rigid) building-material (fullerenes/bucky-balls, carbon-nanowires, graphene-sheets and diamond) it should be enough to convert all Cx-stuff in carbon or carbonmonoxide as basis and exhaust the 'additives' as O2, N2, water or elementar ressources for second-stage processes ... I think in some years there should be the technology tovon VDX - Let's design something! (I've got an idea ...)
Hi Assargadon, ... try to open a motor, then you can test, if it's a common stepper and how much phases it has. - 'normal' bipolar steppers should have 4, 6 or 8 wires - 3-phased have 3, 4 or 6 (sometimes you have some more wires for a tacho or coarse angular sensor, but separated from the motor-lines) - when opened, you should have a permanent-magnetized rotor toothed like a gear - the inner svon VDX - Russia RepRap User Group
Hi Assargadon and Sebastien, ... here is the image of the robot: It seems to ba a fully usable concept, but the motor-type isn't so clear - could be old-styled 3-phase-steppers, as they are longer and taller, then normal steppers ... When the motors arent't conventional steppers, then you have to bring to work the driver -- if they are, and you cant't run the driver, then it would be best tovon VDX - Russia RepRap User Group
... one problem with complete infilling after fabbing could be bubbles between the criss-crossed filament-meshes inside the object. Maybe its better to output the contour-outlines of some layers (3 to 6 layers, so you didn't need criss-crossing filaments and it's faster too), then fill the inner volume with the filler-medium, wait the hardening time, and so on? With a 2K-head this should be thevon VDX - Plastic Extruder Working Group
Hi Reece, ... the actual fabbing methods mostly aren't capable of making (really) usable threads - comercial FDM-printers manage to make bigger threads (as in bottle-caps), but you should have an accuracy in the filament-diameter and slice-height nearly four times finer then the target-thread, or it wouldn't fit properly and wear out or brake very fast ... Better cut the threading on smooth stivon VDX - Let's design something! (I've got an idea ...)
Hi Ian, ... next week (when on workplace again) i'll post the adress of the vendor and some more infos - it's a german company, but shouldn't be a problem with international shipping too ... You can find diode-lasers from 1Watt to 60Watts with then drastically increasing prices - actually we are in developing of an assembly/justage-stage for a special ring-focus-diodelaser with 60 to 80 20Watt-von VDX - Laser Cutter Working Group
Hi RoundSparrow, ... this are 'giveaways', i've got at some 3D-printer-fairs too, made with ink-jetting in a powder-bed ... They turn like 'real' bearings, but the surface is like sand-stone, so you didn't have any real usability, as the body would brake when running with some load. I have some proof-of-concept-parts made with laser-STL-epoxy, ink-jetted in starch or plaster of paris, wax-prinvon VDX - Mechanics
... i built a sintering system with a pigtailed 8-Watt-diode-laser for 320Euros, which i drive with a self-made current-driver in 0,65Ampere-steps from 0,65 to 5,2Amps (e.g. 0,5Watts to <5Watts output-power for longer life) The glass-fibre has a core of 0,1mm - i assembled a two-lenses-optic-head too and have a min-spot of nearly 0,06 to 0,08mm. With this laser-head i sinter gold-paste on avon VDX - Laser Cutter Working Group
Hi Steve, ... VVBG (Very-Very-Big-Grin ) It's obviously not so a good idea to unfold beveled or high resolution-parts with smoothed edges (but this can be optimized by switching the cutting-edges, flaps and interconnections too). When you plan to start with sheet-work, then try to construct with basic objects and smooth the edges after solidifying - with filing or such ... A good strategy fovon VDX - Plastic Extruder Working Group
Hi Steve, ... Pepakura reads Binary STL's, so it seems to ignore the ASCII-STL's ... Here all input-formats: Pepakura Designer File - *.PDO Hexa Great - *.6KT / *.6KS Wavefront - *.OBJ Autocad - *.DXF Metasequoia - *.MQO 3D Studio - *.3DS Lightwave - *.LWO STL Binary - *.STL Google Earth - *.KMZ / *.KML I use mostly the *.3DS or *.LWO-formats as direct output from my programs, but i have to covon VDX - Plastic Extruder Working Group
Hi Demented, ... it's absolute free, what sheet-material you use - with printing on paper, glueing on a hard sheet and cutting the outlines with a saw you can have any rigidity you want ... In Pepakura i can separate the sides in every fashion and flip or delete the suports as ia want, so it's an easy to use 'unfolder' for all kinds of 3D-objects. For milling in aluminium or dibond (plastic-shvon VDX - Plastic Extruder Working Group
Hi all, here i'll post my first 'training'-experiences with paperwork for molding ... - first construct the object in Lightwave: - then import and unfold in Pepakura-Designer : - a bit optimizing: - print'n'cut: - and glue it together: ... then insert all tubes and special parts like screws or threaded rods and fill with polymer, beton, wax or other solidifying stuff. I'll tryvon VDX - Plastic Extruder Working Group
Hi all, ... i got a book with some funny experiments made with home- and kitchen-stuff -- a bit like 'McGyver-style', my older son love it Here i found a description how make a strong plastic and glue from milk (casein) You have only to heat milk (not to boil!) and pour some vinegar into, so the casein separate from the whey. When filtered and dried the casein you can press it in a mold orvon VDX - Polymer Working Group
Hi Jay, ... here a simple sketch: The resolution is higher, when the turned optic is far away, but then the image is darker too. Best lighting is with super-bright white-LED's, as the normal cameras are more sensitive in the blue range - a possible hack is to break away the IR-filter mostly glued on top of the glass-window of the camera-chip. When the light is good (or you can rise the sensivon VDX - Controllers
Hi all, ... because i had some displacement of the dispenser-tip every time i changed the dispenser, i tried to define or reset the new home- or Null-position with a web-cam. Here the images of a 0,2mm- and a 0,9mm-dispenser-needle, viewed with a self-made micro-cam: With the camera embeded upside-down in the corner where the X- and Y-axes have the home-switches i can easily define a very exavon VDX - Controllers
... many years ago i read an arzcle about a guy, who took the electrolyte from normal batteries, wetted paper in it, dried the paper, stacked it with alternating copper- and zinc-sheets to a dry-battery and connected the right sheets ... AFAIK two of this batteries are used in the "German Museum" in Munich to 'ping-pong' a mechanical high-voltage-toy since twenty years! So low-current-batteriesvon VDX - Let's design something! (I've got an idea ...)
Hi Nighthawk, ... it's a plain ASCII-STL with very much triangles (=9448 total, =280 thin triangles, =136 small triangles, no holes) and a very small scaling: X=1,31 Y=1,31 Z=0,275 - this is interpreted as millimeters in most of my importers ... Try to save and import as Binary or reduce the triangle-count and/or the accuracy to reduce the data-amount. I tried to open your file (the cross of avon VDX - 3D Design tools
... what's with a (silver- or tin-coated) crimp-shell around the wire (maybe soldered after crimping too) and then soldering the shell into? Should work much better, then with the naked wire ... Viktorvon VDX - Reprappers
... i only can make real syncing with a controler when driving the CLOCK-signal synchrone to all motors. Look in the Bresenham-algorhythmus for 2D- or 3D-interpolating of linear moving - this works ideally for stepper-motors, when every 'step' in the line is outputted as CLOCK for the corresponding motor ... Viktorvon VDX - Controllers
... the atached images in this post show, how i move the tool-head of a laserploter with two stationary motors over steel-wires. In the two last types with this setup i used wounded steel-wires with 0,5mm diameter and had an overall accuracy of nearly 0,025mm in a drawing area of DIN-A3 or 45x30 mm ... With this method it's no problem to apply high forces and speed - but it's not so rigid, thavon VDX - General
... that's the interesting point! It's actually no real problem to print living cells in 3D-shapes to form body-parts ... It's possible too, make embedded blood-capilaries, basic bone-structures and so on ... But if you want to insert the 'intelligence' we need in form of nerves and some complexer systems (hormon-sensors and -sources, liver-like biochemistry), then it's a long way, until you cvon VDX - Tissue Engineering
Hi Nighthawk, ... maybe it's only the difference between Binary- and ASCII-STL -- open your STL-file in a texteditor, maybe you can check which (if a) compression-format is used too? Or append your STL, then i can look, if there is something unfamiliar. I use different programs for STL-output or converting from other common 3D-formats into STL ... Viktorvon VDX - 3D Design tools