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Line 90: − + − − − ==== <span id="SLA Printing Anchor">SLA Printing</span> ==== − [[File:InvertedSLA.png|302x302px|thumb|right|Inverted SLA Process]] − Stereolithography, SLA, is a part of the manufacturing technology of vat polymerization. This means a light source (laser) is used to cure liquid resin into a hard plastic. − The Form 2 is the only 3D printer that the Prototype Lab has that is an SLA printer. It utilizes the Upside Down or Inverted orientation. − The resin tank has a clear bottom with a surface the resin will not stick to. This allows the resin to cure against the bottom of the tank. − The build platform is lowered into the resin until it is hovering above the bottom surface of the tank, as far away as the height of the layer to be constructed. − The laser is directed through the bottom of the tank and cures a layer of resin onto the build platform. Then, the resin tank slides over and the build platform raises. The wiper will then sweep across the tank to circulate the resin. − The build platform will lower again, and the process will be repeated until the print is completed. − Due to friction caused by de-laminating every layer, every part should be canted in its orientation. This means the part should be angled to reduce the cross sectional area needing to be shifted to de-laminate each layer. This de-lamination also causes the Form 2 to be the Prototype Lab's slowest 3D printer. − Once a part is finished on the Form 2, it must be removed off of the build plate. Try to avoid scraping the build plate when removing parts. Any excess resin must be washed off using the Form Wash, the part must be air dried so that any isopropyl alcohol from the Wash has evaporated, the part should be cured in the Form Cure, and supports should be clipped off. Any remaining support marks can be sanded off if so desired. − Extra information on SLA Printing can be found [https://formlabs.com/blog/ultimate-guide-to-stereolithography-sla-3d-printing/ here]. − − ==== <span id="FDM Printing Anchor">FDM Printing</span> ==== − Fused Deposition Modeling (FDM) printers use a thermoplastic filament, which is heated to its melting point, then extruded to create layers which then build an object. There are many different types of FDM printers. Some use a modeling material and a support material, some just use a modeling material which when creating support will use a different style of layering that allows the filament to break off easily, some are able to use multiple filaments at once allowing for multicolored objects to be created. [[File:Filament_Spool.jpg|250px|thumb|right|Example of a filament spool for a FDM printer.]] − − Both Stratasys printers (Dimension and F370) use soluble support filament (the support filament dissolves in a heated sodium hydroxide bath), the Prusa printers use only a model material, and the Markforge printer only uses model material as well (however it will layer another filament for extra support). − − The filament for these printers comes in spools (basically thin plastic ropes that are wound up). The filament is fed through an extruder head, heated to the desired temperature, then extruded (similar to what happens with a hot glue gun). − − FDM printers can work with various materials, in the Prototype Lab we mainly stick to ABS which is used by the Stratasys machines and PLA which is used by the Prusas. The Markforge uses a material called Onyx (nylon and plastic mix) and will layer in another filament such as Carbon Fiber, Kevlar, etc.
→General Welding Knowledge
* Never try to weld any type of tank that has ever held flammable liquids. This is very dangerous and can explode!
* Never try to weld any type of tank that has ever held flammable liquids. This is very dangerous and can explode!
* Always check your welding hood settings prior to welding. (start with a darker setting and work your way down.
* Always check your welding hood settings prior to welding. (start with a darker setting and work your way down.
* Welding takes lots of practice so don't be afraid to ask for help.
* Welding takes lots of practice so don't be afraid to ask for help.
==General Bead Blasting Knowledge==
==General Bead Blasting Knowledge==