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3D Modeling & CAD for Motorsport: Step 2 - Modelling

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Step 2 - Modelling


00:00 - This modelling step in the CAD process is the core phase where we'll be developing our design as a 3D model from a concept to an accurate representation of the final product.
00:11 This is critical to get an understanding of the solution as well as working towards something that can be manufactured so we need to keep the intended manufacturing method in mind.
00:22 As we've discussed, the design process is going to vary from part to part, most specifically the actual CAD modelling process will generally be different every time.
00:32 Not only are sheet metal parts modelled differently to solid parts that will be manufactured in a mill for example, there are usually also multiple ways to model the exact same parts.
00:44 Although there's no right or wrong process, some ways are faster than others and can be more or less tolerant to modification.
00:51 No matter what CAD software we're using, we generally start by constructing references or working from existing ones such as planes axes and points.
01:03 For solid modelling, we make sketches or use existing profiles and then with our creation tools such as extrude, revolve, sweep and loft, we can generate 3D solid bodies from these 2D profiles.
01:16 Once we have solid bodies, we can then use the modification tools such as fillet, chamfer, shell and so on, to make changes to these bodies.
01:25 Our creation tools can also be used to make cuts to existing bodies and remove material.
01:31 Surface modelling tools are helpful for developing surfaces with complex curves in multiple planes.
01:37 These tools also have their place when designing parts that are very thin compared to their overall size.
01:43 In saying this, surfaces will need to be converted to solid bodies by using tools like thicken to make a model that can actually be manufactured.
01:52 Most CAD programs have a specific set of tools for sheet metal modelling.
01:57 If we're starting off with a normal 3D solid body, we first need to convert this to a sheet metal body before we can use any of the sheet metal specific tools on our design.
02:08 These tools allow us to use common sheet metal processing techniques like bending and forming a part while applying a set of rules to help us design a part that won't deform or tear when formed.
02:20 After our design is formed, we can generate a flat pattern that can be used in a technical drawing, or by a 2D cutting machine to produce the outlined part.
02:29 The CAD tools available to us for 3D modelling are generally based on real manufacturing techniques so it helps to keep the manufacturing process in mind when designing the part.

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