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16 Février 2021
Why Choose SOLIDWORKS 3D CAD? Dramatically improve the way you develop and manufacture products. As the foundation for the entire SOLIDWORKS suite of product development solutions, SOLIDWORKS CAD packages cover design, simulation, cost estimation, manufacturability checks, CAM, sustainable design, and data management. 3D rendering of spoons in CAD software In 1981, the key products were the solid modeling packages— Romulus (ShapeData) and Uni-Solid (Unigraphics) based on PADL-2—and the surface modeler CATIA (Dassault Systemes). Autodesk was founded in 1982 by John Walker, which led to the two-dimensional system AutoCAD.
Designers have used computers for calculations since their invention.[1][2][3][4]Digital computers were used in power system analysis or optimization as early as proto-'Whirlwind' in 1949. Circuit[5]design theory or power network methodology was algebraic, symbolic, and often vector-based.
Between the mid-1940s and 1950s, various developments were made in computer software. Some of these developments include servo-motors controlled by generated pulse (1949), a digital computer with built-in operations to automatically coordinate transforms to compute radar related vectors (1951), and the graphic mathematical process of forming a shape with a digital machine tool (1952).[6]
In 1953, MIT researcher Douglas T. Ross saw the 'interactive display equipment' being used by radar operators, believing it would be exactly what his SAGE-related data reduction group needed. Ross and the other researchers from the Massachusetts Institute of Technology Lincoln Laboratory were the sole users of the complex display systems installed for the pre-SAGE Cape Cod system. Ross claimed in an interview that they 'used it for their own personal workstation.'[7] The designers of these early computers built utility programs to ensure programmers could debug software, using flowcharts on a display scope, with logical switches that could be opened and closed during the debugging session. They found that they could create electronic symbols and geometric figures to create simple circuit diagrams and flowcharts.[8] These programs also enabled objects to be reproduced at will; it also was possible to change their orientation, linkage (flux, mechanical, lexical scoping), or scale. This presented numerous possibilities to them.
Ross coined the term computer-aided design (CAD) in 1959.[9][10]
The invention of the 3D CAD/CAM is attributed to French engineer Pierre Bézier (Arts et Métiers ParisTech, Renault). Between 1966 and 1968, after his mathematical work concerning surfaces, he developed UNISURF to ease the design of parts and tools for the automotive industry. UNISURF then became the working base for the following generations of CAD software. Pubg mobile tencent system requirements.
In the 1960s, technological developments in the industries of aircraft, automotive, industrial control, and electronics provided advancements in the fields of three-dimensional surface construction, NC programming, and design analysis. Most of these developments were independent of one another and often not published until much later. Some of the mathematical description work on curves was developed in the early 1940s by Robert Issac Newton.[citation needed] In his 1957 novel The Door into Summer, Robert A. Heinlein hinted at the possibility of a robotic Drafting Dan. However, more substantial work on polynomial curves and sculptured surface was done by mathematician Paul de Casteljau from Citroen; Pierre Bézier from Renault; Steven Anson Coons from MIT; James Ferguson from Boeing; Carl de Boor, George David Birkhoff and Garibedian from GM in the 1960s; and W. Gordon and R. Riesenfeld from GM in the 1970s.
The development of the SKETCHPAD system at MIT[11][12] by Ivan Sutherland, who later created a graphics technology company with David Evans, was a turning point.[11] The distinctive feature of SKETCHPAD was that it allowed the designer to interact with their computer graphically; the design can be fed into the computer by drawing on a CRTmonitor with a light pen. In effect, this feature of SKETCHPAD was a prototype for a graphical user interface, an indispensable feature of modern CAD. In 1963, under doctoral adviser Claude Shannon, Sutherland presented his PhD thesis paper, Sketchpad: A Man-Machine Graphical Communication System, at a Joint Computer Conference. In his paper, he said:[13]
For drawings where motion of the drawing or analysis of a drawn problem is of value to the user, Sketchpad excels. For highly repetitive drawings or drawings where accuracy is required, Sketchpad is sufficiently faster than conventional techniques to be worthwhile. For drawings which merely communicate with shops, it is probably better to use conventional paper and pencil.
Over time, efforts would be directed toward the goal of having the designers' drawings communicate not just with shops, but also with the shop tool itself; however, it was a long time before this goal was achieved.
The first commercial applications of CAD were in large companies within the automotive and aerospace industries, as well as in electronics. This was because only large corporations could afford the computers capable of performing the necessary calculations. Notable company projects included a joint project between Patrick J. Hanratty from GM and Sam Matsa, Doug Ross's MIT APT research assistant from IBM, to develop a prototype system for design engineers, DAC-1 (Design Augmented by Computer) 1964, Lockheed projects, Bell GRAPHIC 1, and Renault.
One of the most influential events in the development of CAD was the founding of Manufacturing and Consulting Services Inc. (MCS) in 1971 by Patrick J. Hanratty,[14] who wrote the system Automated Drafting And Machining (ADAM), but more importantly supplied code to companies such as McDonnell Douglas (Unigraphics), Computervision (CADDS), Calma, Gerber, Autotrol, and Control Data.
As computers became more affordable, the application of CAD gradually expanded into new areas. The development of CAD software for personal desktop computers was the impetus for almost universal application in all areas of construction.
Other notable events in the 1960s and 1970s include the foundation of CAD systems United Computing, Intergraph, IBM, and Intergraph IGDS in 1974 (which led to Bentley SystemsMicroStation in 1984), as well as the Applicon in 1969 and commercial CAD systems from Japanese manufacturers Seiko and Zuken during the 1970s.[15]
CAD implementations have evolved dramatically since this early development. Initially, with 3D in the 1970s, CAD was typically limited to producing drawings similar to hand-drafted drawings. Advances in programming and computer hardware,[16][17] most notably solid modeling in the 1980s, have allowed more versatile applications of computers in design activities.
In 1981, the key products were the solid modeling packages—Romulus (ShapeData) and Uni-Solid (Unigraphics) based on PADL-2—and the surface modeler CATIA (Dassault Systemes). Autodesk was founded in 1982 by John Walker, which led to the two-dimensional system AutoCAD.[18] The next milestone was the release of Pro/ENGINEER in 1987, which heralded greater usage of feature-based modeling methods and parametric linking of the parameters of features; this marked the introduction of parametric modeling.[19]
Also important to the development of CAD was the development in the late 1980s and early 1990s of B-rep solid modeling kernels (engines for manipulating geometrically and topologically consistent 3D objects), Parasolid (ShapeData), and ACIS (Spatial Technology Inc.). These developments were inspired by the work of Ian Braid. This subsequently led to the release of mid-range packages such as SolidWorks and TriSpective (later known as IRONCAD) in 1995, Solid Edge (then Intergraph) in 1996, and Autodesk Inventor in 1999. An independent geometric modeling kernel has been evolving in Russia since the 1990s.[20]
Availability of free and open-source CAD software and high costs of advanced and 3D CAD software may restrain the growth of the CAD software market.[21]Free and open-source CAD software packages include BRL-CAD developed for the US Army,[22][23]LibreCAD,[24]FreeCAD,[25][26][27] and others.[28]
CAD software:
A common question from new CNC software users is, 'What CAD program do you recommend?' As you might guess, the answer is, 'It depends'. Here is a list of the best deals in free or inexpensive CAD programs.
One quick note, if you're a Mac user then check out our list of 3D CAD programs for the Mac / OSX.
3D modeling programs are used to make models for animations or video games and those models are never meant to leave the computer. These programs will let you design complicated shapes easily but they can make it more difficult to design mechanical shapes to exact dimensions.
Blender (Free) - Blender is a free, open source 3D modeling program. The interface is very non-traditional and will require some adjustment if you've got experience in a more traditional 3D design program. Amazon stocks a ton of books about Blender so it should be easy to find some material to help you out.
Silo3D ($99-$159) - Silo3D is a subdivision modeling program that, like Blender, is not primarily targeted at users trying to design models to be machined. It is incredibly powerful and the interface is easier to learn than Blender. This is a great value if you're looking to model organic shapes.
Free form CAD programs let you design dimensionally accurate models but don't impose any structure or workflow on your methods.
Sketchup (Free or $500)- Sketchup is a CAD program that was originally targeted to the architectural market. It is a very simple program to use but it isn't well-suited for organic shapes. In 2006 is was acquired by Google and a free version was released. The free version will not export an STL file but several people have written plug-ins that allow Sketchup to export an STL without paying for the full version. The various approaches are discussed here . You can also buy a commercial STL exporter from sycode
Viacad 3D ($99)- Viacad is a simple , powerful 3D CAD program. It isn't as popular as some of the others here but it's inexpensive and you can get up and running quickly. It is available for Mac and PC, making it unique in this list.
MoI ($295)- MoI (Moment of Inspiration) is a 3D CAD program that was designed to be usable on tablet or pen computers. Because of this, the user interface is simple and doesn't require a lot of typing. It was written by a single guy, who was one of the original developers of Rhino, so it's powerful without being bloated. It is equally well-suited to organic or mechanical shapes. Without a doubt, this is one to try.
Rhino ($995)- Rhino is one of the most powerful and flexible CAD programs anywhere. It has every kind of tool you could need and , like MoI, is equally well-suited to organic or mechanical shapes. It isn't inexpensive but it does almost anything you could need. If you happen to be a student then you can get a significant discount. Version 5 will also be avialable on Mac OS X when it is released.
Parametric CAD programs keep the entire history of the model as it is being built. If you find the need to change a shape or dimension then you just go back in the history, make the change, and the model will be rebuilt automatically. If you make a big change then you may have to do a little work to get the model rebuilt properly but it's still going to be faster than a program like Rhino. Parametric CAD programs are incredibly powerful if you are willing to spend the time to get your head around the workflow.
OnShape (Free - $80/Month)- OnShape is a new cloud-based CAD program from the same team that created Solidworks. It runs completely in the browser so it runs on PC, OS/X or even an iPad. There's a range of pricing options and for many users, it's totally free.
Alibre / Geomagic Design ($199- $1400)- Alibre is a very powerful parametric CAD program that is available for very little money if you only need to export to STL. They take a lot of pride in the fact that you can do 99% of what the very expensive programs can do at a fraction of the cost. As a comparison, Solidworks, one of the most popular programs in this category, will cost you a minimum of $3500 to buy it and $1200 a year for updates. The $99 version of Alibre is the most amazing deal on this page.
Although it's in no way a low-cost program, Solidworks works very well with MeshCAM and it's very popular with MeshCAM users. Just in case you're one of them, we've got a Solidworks CAM page with some instructions to help get you started.
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