... you can embedd other parts and materials by placing them on the bed and fabbing the body 'upside down'. As hint for changing/finishing the surface you can heat the fabbed object with a hotair-gun or gas-torch (be very carefully then) and stick some thin sheets of your 'finishing' material on the melted surface (for example PTFE-stripes, aluminium or even cutted fitting steel-film parts) or svon VDX - Reprappers
... i have different coloured glue-sticks (see the image in the linked post) with different hardnes and rigidity. Maybe they are made from different materials too? I think its mainly EVA, but i have some special glue-sticks and granules meant for wood, they are really stinky ... Most of the translucent ones are elastic, the yellowish and some of the brown are stiffer, so would be a good materiavon VDX - Reprappers
Hi Andreas, ... a hint for sharp photography with IR-translucent objects: - position something substantial (e.g. a flat box) as dummy-target beside your part in the same distance. Then focus the target with half-pressing the camera-button. Then hold the button, turn the camera to focus your part and finally press the button to get the image ... Beside - read through this thread resp. glue-gun-fvon VDX - Reprappers
Hi Andreas, nochmals willkommen Meine ersten 'mechanischen Ideen' fvon VDX - Schwarzes Brett
Hi Andreas, fast recovery for your son! - My two consume most of my time even when they're well For your design - when you want to reduce the count of used IO-pins, add discrete stepper-drivers with only two pins per motor (DIR and CLCK). You can find cheap IMT901-drivers or better the SMC11-drivers from Nanotec ( for nearly 30 Euros each) - they manage 1/8 (1/16) microstepping and drive motvon VDX - Reprappers
... now the other evolved to 3D-chips. DarthVaders mask (milled from black POM and floor-laminate): Viktorvon VDX - General
Hi Andreas, ... good start I see, you have the new Robo-Pro and -expander - so enough ports for future needs ... Some ten years ago Fischertechnik sold 2D-plotter-kits with aluminium-bars and stepper-motors, so if you'll eventually find some of this sets (ebay or elsewere), you could build more rigis mechanics - some big companies (Volkswagen, BMW, Siemens, ...) developed most of their electrvon VDX - Reprappers
... i (reversible) disassembled one of our windows-blinds and made some photos (appended) - the sprocket and the fastener/merger are reprappable parts ... And we already had some discussion about beaded belts (here: ) or moulding beads over strings or connecting ball-chains (here: ) Viktorvon VDX - Mechanics
peteredworthy Wrote: ------------------------------------------------------- > ... > Am I right in > thinking that a mA scale constant current device > in series with the RTD would produce a voltage > across the RTD proportional to it's resistance & > hence the temperature? yes, with a constant current the voltage drop over the resistor is temp-proportional and linear too .von VDX - General
... why didn't you use a PT100 as temp-sensor? - I use the 'naked' types with the blue glass-sealing: It gives a nearly linear range from 0von VDX - General
Hi Larry, i have some very thin MICA-sheets which are normally used as isolator for high-power-transistors - you can bend them to fit on the surface of a coffee-mug, but not much more or they will break. Modern much more elastic heatsink-insulators are made from silicone with some embedded fabric - maybe very thin mineral-fibres. Maybe you can use glass-fabric (as used with epoxy for buildingvon VDX - Mechanics
... maybe aluminium- or iron- casting moulding for the complexer parts? We had som discussions about lost-cast-moulding: - reprap the parents from plastic or wax (or mould wax-copies), make sand-waterglass-moulds, sinter/burn the moulds or simply pour the fluid metal through the wax-object ... Viktorvon VDX - Mechanics
Hi Max, i'm interested too! I have two main areas for sintering ceramics or metallic compunds: - first room-temp-fabbing and/or IR-presintering 'green' parts and finish in the kiln - second combining paste-extruding and laser-sintering for fabbing ceramics with embedded conducting 3D-segments 'on the fly' ... Viktorvon VDX - Casting and Moldmaking Working Group
... we already had here some spam-bots which simple copied a piece of a previous post and added a link or reference to another post. Some of this copy-paste-operations were clever enough, so some caught response from users The spam posted here could be a simple 'ping' for checking the presence of a site or forum ... Viktorvon VDX - Controllers
... then i would recommend black POM-sheets as ideal material - black for good absorbing laser-energy and it have exellent specs for wear and rigidity ... I'm milling all my micro-grippers with solid-state hinges, mechanical parts and all other stuff (see in my posts about "Han Solo") from POM. The only parts i milled from Nylon were the big triangles in my Tripod-toy - it's more 'soft' when mivon VDX - Mechanics
Hi Demented, yes, it's the best adress for self-made leight-weight high-power-motors for model-planes and helis! If you're interested, then i can translate some specifics - or you try squeezing the german words through a translator Viktorvon VDX - General
... some companies as Airbus and developer of military vehicles are experimenting with carbon-fiber-fabrics - they sew CNC-cutted parts together, inflate to the final 3D-form and imbue with epoxy to get the rigidity ... So weaving, stitching, crocheting and knitting evolves to high-tech-methods! So why not experimenting with similar techniques for rigid, usefull and extreme lightweight frames avon VDX - Mechanics
... for connecting electronic components you could embedd them while fabbing, and/or pierce the legs into fabbed holes, which will be later filled by the fluid metall. For populating and/or changing IC's (or other components too) after fabbing you can embedd single sockets per pin or complete pin-arrays as used for PCB's - but pin-arrays would counteract the elasticity of the main body, so theyvon VDX - Plastic Extruder Working Group
... seems to be a 'copy-spam-bot', no real person ... Viktorvon VDX - Controllers
Hi all, here is an interesting design of milling or laser-welding workpieces which are bigger than the tool-size - (image on the right side), what would be interesting for the reprap too. Additionally it's an interesting design for a sturdy frame made from stiff sticks ... Viktorvon VDX - Mechanics
... for ABS you could solve the adhesion-problem with painting a porous surface (e.g. wood or floor-covering laminate-pieces) with ABS-dust solved in acetone. It's known as ABS-glue and solidify to a hard ABS-surface with nearly 70% stability of the original ABS-material. Should work for every other plastic too when you find the right solvent ... Viktorvon VDX - Mechanics
... in my motor-shaft-couplings i use pneumatic hoses, which are good stiff but a bit elastic too, so i could heat and wind/push them over the thread and motor-axis and use without any zip or such. Look here at the images in my first post: So it would be best to super-glue an adapter on the motoraxis, so it would heave the same diameter as the leadscrew and you can use a similar hose with thevon VDX - Reprappers
... look here: - some examples of home-made motors for model-planes and -helicopters ... Viktorvon VDX - General
Hi all, i've already mentioned Galinstan ( ) - a nontoxic liquid metal replacing mercury in some applications, and we had some talk about Woods- or Field-metal or conducting pastes as conducting trays in fabbed PCB's. A good idea for building elastic PCB's or 3D-objects embedding IC's and other active and passive components (for example in 'wearable' electronics) would be fabbing the body of tvon VDX - Plastic Extruder Working Group
... it could be like open-souce or free-ware software: - someone developed something on his own to get a special solution for a personal problem or for training/learning purposes or such ... As nobody would pay for this extremely specialized item, he gives it away for free ... Or look on the 'comercialized' linux-distributions - they are basically free, but someone (or a company) selected and ovon VDX - General
Hi John, ... we already had some talk about using PTFE-tapes and PTFE-coated glass-fabrics against bulk PTFE-stripes and -blocks. I used milled blocks of PTFE and -coated material for heavy-load-sliding in microassembly and microscopy. Both works good when in a clean and dustfree area - but when you let it settle over time, then the thin PTFE-coated sheets have a backdraft: they are harder thevon VDX - Mechanics
... i prefer Delrin/POM instead of PMMA or Polycarbonat - the surface isn't so hard, but the material is more rigid in specs of wear, brittleness and such. And i can mill it without coolant ... The main colours are white and black, but there should be some other colours too - only 'clear' isn't possible. Viktorvon VDX - Mechanics
Hi Forrest, but this sort of sliders isn't intended for greater loads, we built our first pen-plotters with them ... For medium loads i mostly use bush-bearings and for heavy loads (as in my CNC) supported rails. Here a sample of bush-bearing-sliders which i used for laser-plotters and what should be fine for a repstrap too: The only bad thing - they aren't reprappable ... Viktorvon VDX - Mechanics
Hi all, here i have two examples of linear sliders i used in high-precision but leightweight XY-plotters - the "KF-5" (black plastic body) is from a Gould-XY-plotter, the "KF-3" we made from aluminium and lathed rolls on ball-bearings with two normal and an excenter-screw: Atached some detail-images Viktorvon VDX - Mechanics
AFAIK comercial fabbers use a tree-like morphology of the support as sketched here: So you need only small volumes of support and through forking at the top you can define any surface as support for the fabbing. I have a chunk of support-material from a 3D-printer - it's a brownish, brittle hollow tube-structure made of some sort of shugar ... Viktorvon VDX - Plastic Extruder Working Group