Hi Jay, ... the chocolate-moulding needs only 70by VDX - Plastic Extruder Working Group
... best for glueing and shielding electrostatic stripes is Polyimide - it's commonly used in flexible PCB's, but you can by it as fluid too which will harden when cured at 175by VDX - Mechanics
Hi Eric, ... CD's aren't so good mirrors - when you have a parabolic surface then it's much simpler and more efficient glueing aluminium-foil on it. With a good finish and using spray-glue it's nearly a perfect mirror for the sun with a spot in the size of 2 to 4 centimetres - this is much more heat then with the suboptimal CD's, which give a spot of 11 cm diameter only and with a poor reflectiby VDX - Let's design something! (I've got an idea ...)
Hi all, because our last effort to make some "Han Solo in Carbonite"-chocolate bars with moulding in wax didn't work fine, i tried with a kit of 2K-silicone-rubber. Here are some images of moulding the milled "Han Solo ..." with the silicone: It works fine - the details are very accurate and the separating of the form from the original and later from the chocolate-bar's is very easy (theby VDX - Plastic Extruder Working Group
Hi Joseph ... i tried with plastic-mirrors from our tool-store (can be found in the art/deco or as tiles in bath/kitchen) cut in 4x4mm-squares and glued on the inner surface of a 60cm-satellite-dish - works very good, but with glass-mirrors it's much better! When i'm comming to this some time again, i want to order some houndred small circular glass-mirrors and recycle an old 120cm-dish (we useby VDX - Let's design something! (I've got an idea ...)
... i too wouldn't recommend using hv for SMD-handling. In one of my old XY-writers i have a 2kv-static-sheet for adhesing the paper, on another it's a vacuum-plate and on the plotters i use magnetic stripes. This kind of fixing is only intended for elastic sheets or big plates ... Viktorby VDX - Mechanics
Hi Fernando, i'm on it ... On monday i started on my new daytime-work, so some other problems have to wait, but on weekend i want to test with my children moulding the "Han Solo in carbonite" into the resin and then make some "Han's in chocolate" With the remainders i'll try with your UV-activators and maybe with another probe of the transparent resins ... Viktorby VDX - Plastic Extruder Working Group
... you can salvage old and/or outweared copiers or laser-printers; they have one or more small high-volt-modules. I have some from 2kV until 8kV, in DC or AC - but my best (and sure deadliest) salvaged device for 'sparks-n-fun' is a sealed module capable of 1mA @ 14kV ... Viktorby VDX - Mechanics
... i remember a tv-documetation, where a brandnew method for building extremely lightweight but rigid wings and fuselage for planes (i think for the Airbus) was presented. There were big sheets of carbon-fabric, cut with a CNC, sewed together in the right fashion, inflated to receive the proper 3D-form and last impregnated with epoxy to get the needed rigidity ... When the parts were hardened,by VDX - General
hi r2kordma, the difference is mostly the diameter of the pen-tip versus inkjet-dotsize. The plotter is as accurate as the XY-mechanic - the plotters i built or used were commonly at 1/40 mm (e.g. 25 microns) With a pen in my CNC in half-step-mode i have an accuracy of 12,5 microns per step, with switching to 1/256-microstepping it would be in the range of 100 nanometers (theoretically ) Comby VDX - Let's design something! (I've got an idea ...)
... here is a video of a bit more sophisticated and faster homebrewed SMD-robot: Some guys in our CNC-forum have built nice 'toys' Viktorby VDX - Let's design something! (I've got an idea ...)
... maybe with highly sophisticated robots/omnibots in the role of the 'proletarians' it's worth to rethink - but then you eventually have to deal with sophisticated KI, evolving and revolting too? Viktorby VDX - General
... maybe someone knows the "Millipede"-device, developed in the 90-th by one of the inventors of the PZT-actuators? It's a frame equipped with some hundreds to some thousands microscopic triangles, each with a tip which could be heated and a PZT-bending-sensor. This frame rests over a plane surface of some thermoplastic polymer in the size of maybe a square-centimeter and can be moved with twoby VDX - General
Hi all, today i was in our "Bauhaus"-tool-store and found some 0,2mm-NiCr-wire (replacement for styro-cutter, 30m-spool = 4 Euros) But the best part i found is a heat-resistant silicone-rubber for moulding which is capable of 450by VDX - Plastic Extruder Working Group
Hi Reece, i think Meshlab ( ) should be on the CD too - it's good for editing and converting high-volume 3D-data. Viktorby VDX - RepRap Host
Hi Bob, ... connect the wires first with all electronics and motors loose, then you know exactly, which combination and directions you have. So you're able to change the wiring if necessary ... Viktorby VDX - Controllers
Hi Fernando, for easy heating below 100by VDX - Plastic Extruder Working Group
Hi Steve, ... for testing with ABS you can reuse the housings of outweared flatbed-scanners or printers - they commonly are made from ABS. Grind some of the plastic down to powder, then you can solve it to ABS-paste, remelt it to pure ABS-bricks or squeeze melted ABS through a tube for filament ... Viktorby VDX - Plastic Extruder Working Group
Hi Reece, thanks for the info - i tagged the link and wait until it's released to download and test. It seems you have to register for acces to th download-area Viktorby VDX - General
Hi nition, ... should work faster (or smoother), as you calculate all timing and divisions before plotting the line. When plotting, then you only have to select the right step-delay-time from your ramp (increasing in the start-phase, decreasing before stop). You have to convert the floating numbers in nearest integer e.g. INT(DIV + 0.5), the stepping is INT anymore. Search for Bresenham in Wiby VDX - RepRap Host
Hi nition, AFAIR my implementation work in another way: When for example the plotter had to draw a line from 0,0 to 720,120, then i had to pulse the X-motor exactly 720 times and the Y-motor steps synchrone every 6. X-pulse. For the speed i had to calculate the max-speed per step and the ramp from start to run and from run to stop in respect to the direction-vector. So i had (in Simons-Basic oby VDX - RepRap Host
... i'm more for the bionic approach - hydraulic actuators and pressure-sensors all over the machanic (read through the posts, ther it's described) Viktorby VDX - Plastic Extruder Working Group
Hi Fernando, ... i think it's worth a try. I didn't receive any other resin until now and start in May at my new daywork, so the comming two weeks are reserved for the family. I'll try anyway - so when you give me some of your probes and resins i hope to bring the experiments to work in May ... Viktorby VDX - Plastic Extruder Working Group
Hi John, first i tested different PZT-drives and motors (e.g. ), then selected the piezo-legs ( ) for positioning and driving the microgrippers. Some of my positioning stages were driven by magnets and ferrofluid-actuators or stick-n-slip-free ferrofluid-gliders. Here you can see some of the products i developed then: micro-grippers ( ) and micro- and nano-positioning stages ( ). Actuallby VDX - General
Hi John, in the last years i developed some micro-grippers and nanopositioning-systems and actually i'm again in the process to enhance my CNC-mill at home down to single microns accuracy and precision. On my last daywork in one of the projects we had to handle platinum nano-wires to assemble some gas-sensors, so nano-hands were very welcome - but the needed accuracies and technologies are extby VDX - General
... here (data in the link, images 4 and 5 in the paper) and in the previous posts we discussed the accuracy of a parallelized scara-robot in respect to a sequential setup as in a robot-arm or the scalability of some other systems (or search for "tripod" in the forum). Viktorby VDX - Mechanics
Hi r2kordmaa, ... for 360by VDX - Plastic Extruder Working Group
Hi r2kordmaa, when you want high accuracy and more rigidity with 'weaker' material (as plastic) and motors, then other designs as planar-knematics or scara-robots shouold be more interesting, than the single-arm-design - go through the links int this article: or search the forum with the keywords "parallel-kinematics", "scara" or "string-bot" ... Viktorby VDX - Plastic Extruder Working Group
Hi r2kordmaa, ... the possible positioning- and focussing-accuracy is as good as the single colour-pixels in your mask - e.g. 0,3 to 0,1 mm with the normal highspeed-scanning. When you remember the tubes in old-style oszilloscopes, then you can see, what's possible with moving the focus only. With a bit optimizing and highres controllers it shouldn't be a problem to achieve accuracies of 5 toby VDX - General