Hi Ankur, ... it's common to define colours with the RGB(,,)-data, where the R/G/B-values are defined either in 8-bits from 0 to 255 or for higher resoultions as analogue values from 0,0 to 1,0. So for example the color Black is defined as RGB(0,0,0) or BackColourR(0),BackColourG(0),BackColourB(0). Then White is RGB(255,255,255) or BackColourR(1), ... With mixing different values you can defiby VDX - RepRap Host
Hi Tobias, ... good to find someone 'nearby' I'm on the repstrapping-way - i have a CNC-mill, with which i hope to combine milling and fabbing with paste-extruding and some experimental mechanical concepts of parallel-kinematics and some noncartesian but very simple to build alternatives. Fernando sent me ingredients for mixing UV-curable resins and i ordered some epoxies and polyester-basesby VDX - Schwarzes Brett
Hi Steve, i made some tests with thin PEEK sheets, on which i placed conducting glue and tempered in the oven at 120by VDX - Mechanics
Hi Ian, my CNC-mill at home has a resolution of 25 microns per full step or 12,5 microns per halfstep (as in the actual setup). With this resolution i can mill in aluminium with a repeatability of +/-12,5 microns, but with a 'real' accuracy of maybe 50 microns, dependant of milling speed, mill-diameter, teeth-count and some other parameters - you can see some samples in the images in my relevaby VDX - General
Hi all, today i received three 1/256-microstepping-drivers from IMS: With some of my big old 1.8by VDX - General
Hi Steve, ... it's the same with soap-stone too - the thermal isolation isn't so good as with puffy materials, but it can withstand very high temperatures (much over 1000by VDX - Mechanics
... the core-point of the Bresenham algorhythmus for stepper-moving (or in pixelgraphics too) is the fact that you have an inherent synchronisation of two (or three) axes with respect to the longer axis-projection. This means, you have only to accelerate/deccelerate the motor with the most steps for the specific line and the other motors steps at slower takt-rate but with the ame acceleration raby VDX - RepRap Host
... i have some RS232-RS485-converters, which drives the RS485-side with only two wires ... Viktorby VDX - Controllers
Hi Howie, ... in our german CNC-forum we discussed how cheap a good CNC-mill could be - a youngster hoped to start with 100 to 500 Euros ... Beside the Zenbot and the CNC routing kit from there wasn't much with this low price. The agreement was to collect and wait, until you can buy a 'serious' CNC-mill at a price of 2.000 Euros and above ... Viktor PS: i found an old CNC-mill with a 3axis-by VDX - General
... i tried with milling talk (soap-stone/limestone, several density-grades) as heatresistant (until 1500by VDX - Mechanics
... i'd like the ability to use my CNC-mill for paste-extruding, so i'll have the same hardware for subtractive or additive fabbing ... Viktorby VDX - RepRap Host
AFAIK the best way is to program on your computer a 'real' physics-engine and simulate with the same parameters as your robot would have - when learned, transfer the 'grown-up' neural-network from the simulation into your real bot. Then it 'plays and falls' in the virtual sandbox and would restart in the real life with some basics ... Viktorby VDX - General
Hi Steve, i tried with machineable ceramics from Dotherm: Some tech-specs here: And with milling soap-stone: Viktorby VDX - Paste Extrusion Working Group
... true, but it's much funnier anyway, when your 'beasts' learn on their own and present you some astonishing alternatives Look on the Framsticks-movies here: Viktorby VDX - General
... last i followed a documentation about the "Dacota"-dino-mummy in tv, where they simulated the biped-walk of the hadrosaurs and T-rexes - it was funny to see, how the biped's in the simulation 'learned' to walk and run from scratch in a progressive learning curve. After some hundred thousands 'lessions' the programm managed to steer the simulated dinos in rough terrain and in virtual battlesby VDX - General
... ABS should work much better - AFAIK after solving in acetone and complete drying it's around 70% the strength of bulk (e.g. extruded) ABS. I used this sometimes to glue together or repair ABS-elements ... Viktorby VDX - Polymer Working Group
Hi Andy, ... i tested with heating for faster hardening, it's not essential when you wait between the slices until it's hard enough ... Today i tried the hardened polystyrene - it's complete hardened, but stays brittle, so i't not such a good material for fabbing. I think it's more suitable for sacrifice mold-forms or as support-material. Viktorby VDX - Polymer Working Group
Hi, ... i tried with polystyrene (styropor) solved in acetone: It's very easy to dissolve - simply put as many foam in the acetone as you want. When the foam dissolves it morphs to a paste with a fixed amount of acetone in it, the other acetone stays as separate fluid phase and didn't mix/solve, so you can extract the paste and let the not embedded acetone in the pot. Then i put some paste inby VDX - Polymer Working Group
... when heating the topmost layer to evaporate the solvent (IR-heater or hot air) then it should shrink mostly vertically, so you should calculate the layer-hight/slicing with this shrinking. Horizontal shrinkage should be in a very low percentage, when layered on a complete hardened surface. Another excelent point should be the good interlayer adhesion, as the acetone re-solve the surface ofby VDX - Polymer Working Group
Hi nophead, yes, i milled the "Han Solo in Carbon"-thingy out from black DELRIN/POM because it should be REAL BLACK ... It's my best material - stiff for construction, elastic when used for solid-state-hinges and very good and accurate milling without any coolant in any cutting speed (my millhead runs with 11000 until 25000 RPS and until 50mm per second travelling speed). The next selection isby VDX - Reprappers
... i want to try with all types at hand. The hint with polystyrene-foam (styropor) solved in acetone should be interesting too - maybe with a heating-break per slice to harden the surface ... Viktorby VDX - Plastic Extruder Working Group
Hi nophead, the Drader Injectiweld/Orbi-Tech-injection-press works with 1000 bar pressure! I think you need at least 5 to 10 bar for a coarse fitting, better some 100 bar, which could be made with a drill-press and metal forms. This high pressures are most made with small pistons pressed in the fluid plastic - you can calculate the end-pressure by the diameter of the piston and the force you aby VDX - Reprappers
Hi Forrest, ... got the point Maybe i'll try to make a molding form from aluminium with my CNC-mill and shoot some plastic-parts with the drill-press ... In the mean-time my older son ordered some StarWars-toys: Viktorby VDX - Reprappers
Hi Fernando, your stuff is ready to use, but i didn't find time until now (some trouble around), so the experiments delayed, maybe i'll find some time next week. The pneumatic dispenser i borrowed from a previous company wasn't usable (all tubes filled with hardened epoxy), so i have to build a new one from scratch - i think a mechanical dispenser with a motor-piston should work better ... Vikby VDX - Plastic Extruder Working Group
... wow, thats impressive - especially the 'dance' on ice and the single-step-walk over the stones ... When i heard 'dog' and 'robot', then i remembered another video - Let's fab some robots and artificial pets to play with next Viktorby VDX - General
... in the past i found a mini-injection-molding system from Drader Injectiweld at Orbi-Tech: The price is something around 3000 Euros, but with a CNC-mill you can easily make some molding forms for bigger series ... Viktorby VDX - Reprappers
... i used pneumatic hoses for coupling, they are stiff enough but have some inherent elasticity, so you can push them over thicker rods or threads: Here: we discussed some of the specs ... Viktorby VDX - Reprappers
... my CNC-controller has a RS232-port, what's more suitable for actual PC's which have a Serial port or over a USB-to-Serial-converter-cable. On the other side i have some discrete stepper-drivers with CLK/DIR-input, which i could wire to a parallel port, but it's much better to drive them with a microcontroller-board, which has an USB- or serial interface. So i want an open and freely reconfiby VDX - Controllers
... another idea: - instead of ultrasonic welding you could maybe try with inductive welding? When you have metallic/ferromagnetic particles in your FDM- or dispenser-paste or coat the topmost slice with a thin layer of iron-dust, then you can apply a high-frequent EM-field, so the embedded metallic particles start to rotate and vibrate. The vibration of the particles heats only the area aroundby VDX - Mechanics
... here: i started a discussion about 'mega-sized-repraps' and fabbing with construction-foam (or 2K-polyurethane-foam) which you can extrude in centimeter thick trays from pressurized bottles. With the possibility to print with trays of some centimeters diameter it's very interesting to design real big robots - for example for building furniture or architectural components ... Viktorby VDX - General