Hi Link to ferite core above has changed full details below to get elsewhere when needed. Material CF139 Equivalent to manufacturer / material Cosmo / CF138, Ferroxcube / 3C90 TDK / PC44 Dimensions U126x91x20 (U shape , base of U 126mm, verticals of U 91mm, square section 20mm x 20mm) U126x91x20 CF139 Part code 6744 01 Ferrite U core. Manufacturer: Cosmby rapatan - MetalicaRap
Hi We have decided to use GitLab As they support tools for moving our data later if necessary. Also support continual software integration, Also NASA uses it. But if you could help setting it up on gitlab that would be great. Kind regards Rapatan My user name is rapatan Project name MetalicaRapby rapatan - MetalicaRap
Hi This is the template file for laser cutting the mica sheet inter 3-wind pcb’s insulators referred to above; Kind regards Rapatanby rapatan - MetalicaRap
Hi Looks Great! Now we got some competition! Excellent Kind regards Rapatanby rapatan - MetalicaRap
Hi This is the transformer for 250khz to 500khz LCC 60KV full bridge SMPS resonant converter we are playing with; Quote number (below) in white in picture on pcb at Picture here ; We ordered 100 pcb’s making 200 individual 3 wind boards you need 151 of these individual 3 wind boards. The plastic parts are in parts section 9 on reprap.org/wiki/Metalicarap. Print in abs solidby rapatan - MetalicaRap
hi We have added some more flanges to the electron gun. So you can build the gun sections. In file and parts section new assemble "assemble301.zip" Notes for the above, Modular design implemented through multiple flange connection in gun, Magnetic Lens 1 and Lens 2 are now designed for ease of manufacturer (Part numbers for lenses is coming in next upload) available when .stp file is unziped aby rapatan - MetalicaRap
hi We have added some more flanges to the electron gun. So you can build the gun sections. In file and parts section new assemble "assemble301.zip" Notes for the above, Modular design implemented through multiple flange connection in gun, Magnetic Lens 1 and Lens 2 are now designed for ease of manufacturer (Part numbers for lenses is coming in next upload) available when .stp file is unzipedby rapatan - MetalicaRap
Hi Still making parts for electron gun, new design of coils soon. Still testing power supply. Good idea to start US group. Kind regards Rapatanby rapatan - MetalicaRap
Hi Updated mechanical parts including minor changes to electron gun and chamber, along with changes to nylon insulators in High Voltage Power Supply Transformer. New information flow enabling people to create there own working drawings; Achieved by downloading files from parts section and opening zipped .stp files in freecad, then exporting each part in FreeCAD drawing workbench. Working drawiby rapatan - MetalicaRap
hi please could the above be removed as this is inappropriet and missleading as max vac for the above chamber is 29 torr, for any beam you need at least 0.001 Torr and for a focused beam on tungsten cathode 0.0001 to 0.00001 , LaB6 cathode 0.0000001 to 0.00000001 Torr kind regards Rapatanby rapatan - MetalicaRap
See notes at the bottom of files and parts section '''Freecad''' the above downloadable files only work on the daily development version on the latest Linux ubuntu trusty! (see below instructions) (The latest version of freecad is required called Freecad-dev (the daily updated version of freecad only runable on the latest ubuntu linux, called linux ubuntu trusty (no windows or OSX supported cby rapatan - MetalicaRap
hi Their are electron beam 3D printers working to day at the same specifications as this printer, as well as electron beam welders (using tungsten cathode filaments at 10-4 torr ). Though the top end printers use a LaB6 cathode's that are longer lasting and brighter but is too costly as it requires better vacuum 10-7 Torr. Standard practise for solving the out gassing chamber wall issue is thby rapatan - MetalicaRap
Hi We have some funding and are testing some parts of electron gun, So further fundraising to support more metal manufacturing and electrical testing teams is the priority 2nd version of powersupply hardware is near completion, power supply software is partially done. So with these new mechanical & electrical testing teams a Electron beam hardware kit can be offered, enabling a electron beby rapatan - MetalicaRap
Some of the ways these drawbacks are being tackled are; Poor Surface finish ; Electron beam process can polish a material on the fly when a small amount of argon is added to process, when more surface deformations are present this polishing process maybe time consumming. Removal of printed support structures Electron beam based process can also electron beam machine the part removing structuresby rapatan - MetalicaRap
looks good for steel, remember ; if you want your machine size to fit in a normal room and print in hours not weeks then you have to work in steel, not other metals, Irrespective of the amount of money you have got to spend on the laser and the size/ rating of its power source. as The larger the laser the longer its focal length so you can get very large machines. Except steel most metals absorby rapatan - Powder Printing and Selective Laser Sintering
hi Yes based around 5166965 cut on 2 C cores as in wiki kind regards MetalicaRap teamby rapatan - MetalicaRap
Build Speed Calculator Laser 808 <!-- "this" is just the selectbox alert('titanium'); --> Aluminium <!-- Cobalt Chromium ENTER FIGURES ABOVE then remove comment arrows --> <!-- Copper ENTER FIGURES ABOVE then remove comment arrows --> <!-- Gold ENTERby rapatan - Powder Printing and Selective Laser Sintering
hi When looking at 3D cad its important to distinguish the engineering tools packages with hierarchical tree structure shape control and those like sketch-up that are 2D planes assembled objects, the first is what engineers use as you cannot end up with holes in your final structures and the second is what graphic designers and initial sketches and some architects use. Now finally there is a reby rapatan - 3D Design tools
hi Think of the large diameter glass outside the whole existing design, so that all the parts need not create a vacuum seal as the glass has already achieved this, this means that all the piston hoopper etc can be printed within the same diamter build chamber on the mother machine through splitting parts in to smaller parts and then assemble them. The bars they would hang off therefore fit outsby rapatan - MetalicaRap
hi Yeah we have moved on, We hopefully have found a way of removing any need for TIG welding equipment, reducing costs and allowing mother printer to self print build platform piston/powder cylinder in sections by having an outer main chamber made of glass. So that any welding that is needed can fit within the mother machine. This may be achieved by using a 6inch 4 way reducer as filament/ anby rapatan - MetalicaRap
Corrected version hi The goal is to have affordable home-manufacturing of solar cells, key electrical parts and milled-quality metal parts. Unfortuanately your suggestions would mean we would fail to achive a solar cell process with a laser and key electrical parts need to be in fine metal construction which casting is unsuited too. Given the complex alloy metalurgy behind structural aplicatioby rapatan - MetalicaRap
I will give you those links again. Nasa Article Technical Talk video Aerospace casting quote kind regards all MetalicaRap teamby rapatan - MetalicaRap
Hi Nice machine if you got the power and money! Your largely self reproducing printer is possible in the commercial setting with either laser or electron beam printing parts due to 3 Phase supply and 100K euro 400W laser part purchase not being a problem(as the commercial machines indicate). But its a different story in the single phase setting 10K euro home budget world; due to the power tranby rapatan - MetalicaRap
Interesting? Yet all motors/drive shafts/ sensors for bed would have to be isolated to +70KV , cathode filament waiste thernal heat would have no where to go as completely sealled in TV tubebaffels- an apeture in tungsten plate, waiste thernal heat would have no where to go as completely sealled in TV tubevacuum pipe conection to glass could be complicated/ difficult? thanks MetalicaRap teamby rapatan - MetalicaRap
hi yes could select a different voltage if needed as could tap lower down on secondary and switch sense feedback voltage divider, but more complex. From a quick calculation from your link I get a radius of 3.5 µm for titanium at 80KV ie resolution of 7µm should be ok? kind regards MetalicaRap teamby rapatan - MetalicaRap
hi We are now looking between 62KV and 80KV as from others work we think we can get the beam spot size down to 8µ ø some where between 70 and 80 KV but not much less . In soft metals ( aluminium) penetration of electrons does not exceed too badly the 20µ m depth up to 80KV (see link below). We have a chance of running the transformer in air rather than cumbersome oil up to 75kV if we push it witby rapatan - MetalicaRap
hi we have been considering this? Two large TV tubes with screens drilled through with appox 16inch circular holes , placed face to face with oring between screens, one neck removed where our electron gun is inserted via a o ring, is one path to save 2K euro of chamber metal and get 1 set of free electrical feedthroughs for motors (motors working in chamber) , If you want to help us investigatby rapatan - MetalicaRap
Take a look at this where control of the heated bed is done by the Gen3 extruder 2.2 controller.by rapatan - General Mendel Topics
hi their are some recordings of updates on from earlier this year. Do when you up and running do tell us what area you would like to contribute in. If your not sure where to start getting a roughng pump (vane pump 2 stage goes to 10-3 torr) and TIG welder, old xray power supply and a pirani vacuum guage can make a fun chamber! good luck setting up kind regards MetalicaRap teamby rapatan - MetalicaRap
hi SOunds GReat! have you read the academic paper? its quite explicit on hardware? I love contributers to send a mail to me personally every other month or so So I can see if I can offer any support! kind regards rapatan p.s. It might be a help for you if you send me your own email to "rapatan" on this forum as a personal message (privately) on this forum I can send an invite for you to join ourby rapatan - MetalicaRap