Wells Memorial Institute was a workingman's club in Boston meant to promote social interaction, mutual help, recreation, and training for working people. It was organized in 1879 by Robert Treat Paine , who was inspired by the English working men's clubs , and named after Rev. E. M. P. Wells of the Episcopal City Mission of Boston .
35-574: It offered courses on mechanical drawing , civil service , automobile construction, English, public speaking , cooking , household economics , embroidery , and millinery . It was located at 987 Washington Street. The Lowell Institute lectures on "mechanics" were given at the Wells in the 19th century. This article relating to education in the United States is a stub . You can help Misplaced Pages by expanding it . This article about an organization in
70-698: A technical drawing with the use of computer software . CAD software for mechanical design uses either vector-based graphics to depict the objects of traditional drafting, or may also produce raster graphics showing the overall appearance of designed objects. However, it involves more than just shapes. As in the manual drafting of technical and engineering drawings , the output of CAD must convey information, such as materials , processes , dimensions , and tolerances , according to application-specific conventions. CAD may be used to design curves and figures in two-dimensional (2D) space; or curves, surfaces , and solids in three-dimensional (3D) space. CAD
105-442: A new form of prototyping called digital prototyping . In contrast to physical prototypes, which entail manufacturing time in the design. That said, CAD models can be generated by a computer after the physical prototype has been scanned using an industrial CT scanning machine. Depending on the nature of the business, digital or physical prototypes can be initially chosen according to specific needs. Today, CAD systems exist for all
140-495: A number of key C modules with their own APIs . A CAD system can be seen as built up from the interaction of a graphical user interface (GUI) with NURBS geometry or boundary representation (B-rep) data via a geometric modeling kernel . A geometry constraint engine may also be employed to manage the associative relationships between geometry, such as wireframe geometry in a sketch or components in an assembly. Unexpected capabilities of these associative relationships have led to
175-742: A wide group of users. These include the CAVE or HMDs and interactive devices like motion-sensing technology Starting with the IBM Drafting System in the mid-1960s, computer-aided design systems began to provide more capabilitties than just an ability to reproduce manual drafting with electronic drafting, and the cost-benefit for companies to switch to CAD became apparent. The software automated many tasks that are taken for granted from computer systems today, such as automated generation of bills of materials , auto layout in integrated circuits , interference checking, and many others. Eventually, CAD provided
210-399: Is a requirement for all HVAC work. They are based on the floor and reflected ceiling plans of the architect. After the mechanical drawings are complete, they become part of the construction drawings, which is then used to apply for a building permit. They are also used to determine the price of the project. Arrangement drawings include information about the self-contained units that make up
245-469: Is a type of virtual construction engineering simulation incorporating time or schedule-related information for project management. CAD has become an especially important technology within the scope of computer-aided technologies , with benefits such as lower product development costs and a greatly shortened design cycle . CAD enables designers to layout and develop work on screen, print it out and save it for future editing, saving time on their drawings. In
280-730: Is administered periodically at ADDA-authorized sites. Mechanical system drawings must abide by all of the following regulations: the National Building Code of Canada , the National Fire Code, and Model National Energy Code of Canada for Buildings. For residential projects, The National Housing Code of Canada and the Model National Energy Code of Canada for Houses must also be followed. These drawings must also adhere to local and provincial codes and bylaws. Computer-aided design Computer-aided design ( CAD )
315-568: Is an important industrial art extensively used in many applications, including automotive , shipbuilding , and aerospace industries, industrial and architectural design ( building information modeling ), prosthetics , and many more. CAD is also widely used to produce computer animation for special effects in movies, advertising and technical manuals, often called DCC digital content creation . The modern ubiquity and power of computers means that even perfume bottles and shampoo dispensers are designed using techniques unheard of by engineers of
350-535: Is expected to neither increase nor decrease. It is encouraged to either take two additional years of training in drafting school after high school or attend a four-year college/university to develop better technical skills and gain more experience with CAD (computer-aided design). The American Design Drafting Association (ADDA) has developed a Drafter Certification Test. The test assesses the drafter's skill in basic drafting concepts: geometric construction, working drawings, and architectural terms and standards. The test
385-406: Is generally via a computer mouse but can also be via a pen and digitizing graphics tablet . Manipulation of the view of the model on the screen is also sometimes done with the use of a Spacemouse/SpaceBall . Some systems also support stereoscopic glasses for viewing the 3D model . Technologies that in the past were limited to larger installations or specialist applications have become available to
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#1733085996281420-483: Is made up of many different parts. A fabrication drawing has a list of parts that make up the fabrication. In the list, parts are identified (balloons and leader lines) and complex details are included: welding details, material standards, codes, and tolerances, and details about heat/stress treatments. and also Line diagrams and layouts indicating basic proposals, location of main items of plant, routes of main pipes, air ducts and cable runs in such detail as to illustrate
455-422: Is often in the form of electronic files for print, machining , or other manufacturing operations. The terms computer-aided drafting ( CAD ) and computer-aided design and drafting ( CADD ) are also used. Its use in designing electronic systems is known as electronic design automation ( EDA ). In mechanical design it is known as mechanical design automation ( MDA ), which includes the process of creating
490-439: Is the use of computers (or workstations ) to aid in the creation, modification, analysis, or optimization of a design . This software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. Designs made through CAD software help protect products and inventions when used in patent applications. CAD output
525-441: Is used in many ways depending on the profession of the user and the type of software in question. CAD is one part of the whole digital product development (DPD) activity within the product lifecycle management (PLM) processes, and as such is used together with other tools, which are either integrated modules or stand-alone products, such as: CAD is also used for the accurate creation of photo simulations that are often required in
560-760: Is used in the design of tools and machinery and in the drafting and design of all types of buildings, from small residential types (houses) to the largest commercial and industrial structures (hospitals and factories). CAD is mainly used for detailed design of 3D models or 2D drawings of physical components, but it is also used throughout the engineering process from conceptual design and layout of products, through strength and dynamic analysis of assemblies to definition of manufacturing methods of components. It can also be used to design objects such as jewelry, furniture, appliances, etc. Furthermore, many CAD applications now offer advanced rendering and animation capabilities so engineers can better visualize their product designs. 4D BIM
595-443: The 1960s. Because of its enormous economic importance, CAD has been a major driving force for research in computational geometry , computer graphics (both hardware and software), and discrete differential geometry . The design of geometric models for object shapes, in particular, is occasionally called computer-aided geometric design ( CAGD ). Computer-aided design is one of the many tools used by engineers and designers and
630-565: The 2000s, some CAD system software vendors shipped their distributions with a dedicated license manager software that controlled how often or how many users can utilize the CAD system. It could run either on a local machine (by loading from a local storage device) or a local network fileserver and was usually tied to a specific IP address in latter case. CAD software enables engineers and architects to design, inspect and manage engineering projects within an integrated graphical user interface (GUI) on
665-457: 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 rectangles) have solid volumes added or subtracted from them as if assembling or cutting real-world objects. Two-dimensional projected views can easily be generated from
700-456: The United States is a stub . You can help Misplaced Pages by expanding it . Mechanical drawing Mechanical systems drawing is a type of technical drawing that shows information about heating, ventilating, air conditioning and transportation around the building (Elevators or Lifts and Escalator). It is a powerful tool that helps analyze complex systems. These drawings are often a set of detailed drawings used for construction projects; it
735-409: The design stage, e.g., plant bases These drawings show requirements for building works necessary to facilitate installing the engineering services (other than where it is appropriate to mark out on site). Information on these drawing includes details of all: About 80,000 jobs are held by mechanical drafters in the United States of America during 2008. From 2008 to 2018, mechanical drafting hiring rate
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#1733085996281770-418: The designer to create products that fit the human form and visual requirements as well as they interface with the machine. Originally software for CAD systems was developed with computer languages such as Fortran , ALGOL but with the advancement of object-oriented programming methods this has radically changed. Typical modern parametric feature-based modeler and freeform surface systems are built around
805-431: The designer with the ability to perform engineering calculations. During this transition, calculations were still performed either by hand or by those individuals who could run computer programs. CAD was a revolutionary change in the engineering industry, where draftsman, designer, and engineer roles that had previously been separate began to merge. CAD is an example of the pervasive effect computers were beginning to have on
840-427: The detailed drawing, installation drawing or co-ordination drawing (interface drawing) with the primary purpose of defining that information needed by the tradesmen on site to install the works or concurrently work among various engineering assembly. The main features of typical installation drawings are: A drawing showing the building and services installations as installed at the date of practical completion. Generally
875-413: The drawing sheet can easily be adjusted in the final draft as required, unlike in hand drafting. 3D wireframe is an extension of 2D drafting into a three-dimensional space . Each line has to be manually inserted into the drawing. The final product has no mass properties associated with it and cannot have features directly added to it, such as holes. The operator approaches these in a similar fashion to
910-455: The incorporation of the engineering services within the project as a whole. The schematic is a line diagram, not necessarily to scale, that describes interconnection of components in a system. The main features of a schematic drawing show: A drawing the intended locations of plant items and service routes in such detail as to indicate the design intent. The main features of detailed design drawings should be as follows: A drawing which based on
945-400: The industry. Current computer-aided design software packages range from 2D vector -based drafting systems to 3D solid and surface modelers . Modern CAD packages can also frequently allow rotations in three dimensions, allowing viewing of a designed object from any desired angle, even from the inside looking out. Some CAD software is capable of dynamic mathematical modeling. CAD technology
980-405: The major platforms ( Windows , Linux , UNIX and Mac OS X ); some packages support multiple platforms. Currently, no special hardware is required for most CAD software. However, some CAD systems can do graphically and computationally intensive tasks, so a modern graphics card , high speed (and possibly multiple) CPUs and large amounts of RAM may be recommended. The human-machine interface
1015-422: The models. Basic 3D solids do not usually include tools to easily allow the motion of the components, set their limits to their motion, or identify interference between components. There are several types of 3D solid modeling Top-end CAD systems offer the capability to incorporate more organic, aesthetic and ergonomic features into the designs. Freeform surface modeling is often combined with solids to allow
1050-441: The operator to think differently about how to use them and design their virtual components in a different manner. Virtually all of CAD tools rely on constraint concepts that are used to define geometric or non-geometric elements of a model. There are many producers of the lower-end 2D sketching systems, including a number of free and open-source programs. These provide an approach to the drawing process where scale and placement on
1085-430: The preparation of environmental impact reports, in which computer-aided designs of intended buildings are superimposed into photographs of existing environments to represent what that locale will be like, where the proposed facilities are allowed to be built. Potential blockage of view corridors and shadow studies are also frequently analyzed through the use of CAD. There are several different types of CAD, each requiring
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1120-406: The record drawing is a development of the installation drawing. The main features of the record drawings should be as follows. These drawings show the provisions required to accommodate the services that significantly affect the design of the building structure, fabric, and external works. This includes drawings (and schedules) of work the building trade carries out, or that must be cost-estimated at
1155-454: The system: overall dimensions, weight and mass, identification of all the components, quantities of material, supply details, list of reference drawings, and notes. Assembly drawings detail how certain component parts are assembled. An assembly drawing shows which order the product is put together, showing all the parts as if they were stretched out. This will help a welder to understand how the product will go together so he get an idea of where
1190-406: The system: table of parts, fabrication and detail drawing, overall dimension, weight/mass, lifting points, and information needed to construct, test, lift, transport, and install the equipment. These drawings should show at least three different orthographic views and clear details of all the components and how they are assembled. The assembly drawing typically includes three orthographic views of
1225-552: The weld is needed. The assembly drawing will contain the following; information overall dimensions, weight and mass, identification of all the components, quantities of material, supply details, list of reference drawings, and notes. In detail drawings, components used to build the mechanical system are described in some detail to show that the designer's specifications are met: relevant codes, standards, geometry, weight, mass, material, heat treatment requirements, surface texture, size tolerances, and geometric tolerances. A fabrication
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