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Model-based definition (MBD), sometimes called digital product definition (DPD), is the practice of using 3D models (such as solid models, 3D PMI and associated metadata) within 3D CAD software to define (provide specifications for) individual components and product assemblies.
This can be important for some manufacturing or engineering computation applications. By comparison, when creating geometry based upon boundary representations , additional topological data is required, or consistency checks must be performed to assure that the given boundary description specifies a valid solid object.
The engineering community utilizes them as designs of new devices, vehicles and structures as well as a host of other uses. In recent decades the earth science community has started to construct 3D geological models as a standard practice. 3D models can be the basis for physical devices that are built with 3D printers or CNC machines.
A list of printers with pricing and other information is maintained. [92] Most recently, delta robots, like the TripodMaker, have been utilized for 3D printing to increase fabrication speed further. [101] For delta 3D printers, due to its geometry and differentiation movements, the accuracy of the print depends on the position of the printer head.
3D printing, or additive manufacturing, is the construction of a three-dimensional object from a CAD model or a digital 3D model. [1] [2] [3] It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, [4] with the material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer.
Early construction 3D printing development and research have been under way since 1995. Two methods were invented, one by Joseph Pegna [9] which was focused on a sand/cement forming technique which utilized steam to selectively bond the material in layers or solid parts, though this technique was never demonstrated.
The operator approaches these in a similar fashion to the 2D systems, although many 3D systems allow using the wireframe model to make the final engineering drawing views. 3D "dumb" solids are created in a way analogous to manipulations of real-world objects. Basic three-dimensional geometric forms (e.g., prisms, cylinders, spheres, or ...
In the early-to-middle 2000s, the ASME Y14.41-2003 Digital Product Data Definition Practices and ISO 16792:2006 Technical product documentation—Digital product definition data practices [11] standards were released, providing support for PMI annotations in 3D CAD models, and introducing the concept of MBD (or, alternatively, digital product ...