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AutoCAD was the first major cross-platform CAD application to launch. However, it was not the first to use the term CAD, and the name AutoCAD was not chosen for this reason. Other similar software programs with a history preceding the 1982 AutoCAD release include eCAD, TurboCAD, NCMOS CAD, SABRE Software’s CAD, Visible Edge, among others.
The first version of AutoCAD contained about 100 drawings and features such as block handling, 2D and 3D, and drafting tools. By the time the 1982 release was released, the program had grown in features and power. The AutoCAD introduction was by a group of software engineers led by Don Leman, then a Senior Software Engineer at Autodesk.
In October 1983, Autodesk shipped a “mid-range” (personal computer) version of AutoCAD (AutoCAD I) to allow users to start work without the need for additional equipment. A year later, Autodesk released a less expensive version, the AutoCAD II, which ran on the Apple II, IBM PC/MS-DOS and the Commodore 64. In addition to price, the interface was substantially different. In August 1984, AutoCAD II was published as a DOS-based version available for the IBM PC.
In April 1985, Autodesk released the higher-end “professional” version (AutoCAD II EPS) with more features, available for the Apple Macintosh.
In 1989, Autodesk introduced AutoCAD 3D. The next year, the AutoCAD Graphics/Versioning/Revisioning (G/GR) feature was introduced, enabling multiple AutoCAD users to collaborate on a drawing while using multiple versions. G/GR was introduced as an upgrade in 1992 and went into widespread use, with multiple users viewing, modifying, and updating the same drawing at the same time.
In 1995, Autodesk released AutoCAD LT, with two levels of functionality. In 1996, Autodesk started its own CAD channel, Autodesk Direct, to provide web-based versions of AutoCAD, Inventor and other Autodesk software products. This capability was renamed Autodesk Software Network in 1999. Autodesk Inventor, a PC-based CAD/CAM software application, was also added.
In 1997, Autodesk introduced AutoCAD Map 3D, its 2
AutoCAD
2016-04-13: Only the new RS_2014r3 release has been available for macOS 10.13, and only AutoCAD’s BIDS (integrated development environment) is supported.
2017-04-13:
AutoCAD 2016 SP3 (for both Windows and macOS) has been released with limited support for both scripting and Python.
AutoCAD 2017 SP1 (for Windows) has been released with limited support for Python and Automation add-on.
AutoCAD 2017 SP2 (for macOS) has been released with full Python support and Automation add-on support.
2019-03-19: AutoCAD 2020 has been released with full Python support and Automation add-on support.
See also
Autodesk Corporation
References
External links
Autodesk’s page on AutoCAD history
Category:AutoCAD
Category:3D graphics software
Category:Computer-aided design software
Category:Dynamically typed programming languages
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The present invention relates to a piston of the type disclosed in U.S. Pat. No. 3,667,415, assigned to the same assignee as the present invention. More specifically, the present invention relates to a piston which is formed with concentric, axially spaced main and lateral connecting webs, which define a plurality of recessed pocket openings or ports.
Pistons of the aforementioned type are used as components of various engine valves to control air flow to a combustion chamber. In addition to the desirability of providing a large piston pocket, it is desirable to provide an appropriate arrangement of annular grooves formed in the piston to provide both oil return and oil film separation from the piston surface during engine operation.
The present invention is directed to the achievement of an improved piston pocket which is provided with both adequate pocket area and annular grooves formed in a manner which provide a piston pocket which can be readily molded and which also provides the piston with improved oil separation characteristics.
In accordance with the present invention, a piston for an engine valve includes a plurality of axially spaced main webs and at least one axially extending lateral web, which define a plurality of annular recessed pocket openings or ports. The recessed pocket openings are defined between the main webs and the lateral web. The main webs are of different widths and lengths. The lateral web is generally of uniform width and length. Each of the main webs defines a plurality of first spaced apart grooves formed therein. Each of the grooves extends from the radially outer edge of a respective one of the main webs to a radial edge of the lateral web. Each of the grooves is of uniform width. The lateral web defines a plurality of second spaced apart grooves formed therein and of uniform width. The second grooves are located between the first grooves. At least one of the second grooves defines an opening having a generally rectangular configuration. Each of the first grooves is spaced away from one of the second grooves. The first grooves and the second grooves are arranged such that the second grooves extend generally radially from the outer edge of the lateral web. The lateral web defines a plurality of indentations in the form of axially spaced, equidistant transversely extending slots. The slots are formed between the first grooves. Each of the first grooves terminates in the lateral web. A plurality of indentations in the form of axially spaced
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