Posted by Janicholson on January 19, 2015 at 14:07:38 from (74.60.94.18):
In Reply to: 3D printing posted by David G on January 19, 2015 at 08:56:32:
Companies now make Metal 3D printers. The best of them sprinkle powder .020", sinter the powder with a laser system, then machine the sintered layer. to dimensional correctness and flatness, then do it again. The process is used in Aerospace and extreme technology applications. One cubic inch of deposited material can cost more than $150.00. We have seven 3D printers (None of them metal!!). They print in a variety of plastics including Nylon and ABS. The methods of deposit of the technology is to spread a layer of plastic, then spray glue on it, then repeat and eventually the part is complete and embedded in a loose powder matrix. We then dig them out and dust them. NExt the component is infiltrated with a binder that seals the pores. Several binders can be used. Epoxy, crazy glue, and acrylic are 3. The second process uses liquid polymer and lasers to crosslink the material into a solid. The result is a pretty fair plastic representation. The third is a direct deposit machine that liquifies a "wire" of ABS and extrudes it out in a tight pattern to create the component. The result is still porus and has fair strength, these can also be treated to fill the pores. The 4th type "prints in wax. The wax is then invested in casting plaster and burned out. This allows very precise nearly impossible components to be cast into the resulting molds. The cost of printing with our printers is about $3.00 per cubic inch. The "machines cost from $30,000, to $125,000 each. (The metal printer is way more than that.) We use the printers every day in Engineering and Technology classes and research. Jim
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