131 lines
6.2 KiB
Plaintext
131 lines
6.2 KiB
Plaintext
ÜÜÜÜÜÜÜÜÜÜÜÜÜ ÜÜÜ ÜÜÜÜ
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ÜÛÛÛÛÛÛÛÛßÛßßßßßÛÛÜ ÜÜßßßßÜÜÜÜ ÜÛÜ ÜÛÛÛÛÛÛÛÛÜÜÜÜÜÛßß ßÛÛ
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ßÛÛÛÛÛÛÛÛÛÛÛÛÛÛÜ ßÛÛ ÜÛÛÛÜÛÛÜÜÜ ßÛÛÛÛÜ ßÛÛÛÛÛÛÛÜÛÛÜÜÜÛÛÝ Ûß
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ßßßÛÛÛÛÛÛÛÛÛÛÜ ÞÝ ÛÛÛÛÛÛÛÛÛÛÛßßÛÜÞÛÛÛ ÛÛÛÛÛÜ ßßÛÛÛÞß
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Mo.iMP ÜÛÛÜ ßÛÛÛÛÛÛÛÝÛ ÞÛÛÛÛÛÛÛÛÛ ÞÛÛÛÛ ÞÛÛÛÛÛÝ ßÛß
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ÜÛÛÛÛÛÛÛ ÛÛÛÛÛÛÛÛÝ ÞÛÛÛÛÛÛÛÛÝ ÛÛÛ ÛÛÛÛÛÛ
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ÜÛÛÛÛÛÛÛÝ ÞÛÛÛÛÛÛÛÛ ÞÛÛÛÛÛÛÛÛ ß ÞÛÛÛÛÛÛÜ ÜÛ
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ÜÛÛÛÛÛÛÛÝ ÛÛÛÛÛÛÛÛ ÛÛÛÛÛÛÛÛÝ ÞÞÛÛÛÛÛÛÛÛÛß
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ÜÛßÛÛÛÛÛÛ ÜÜ ÛÛÛÛÛÛÛÛÝ ÛÛÞÛÛÛÛÛÝ ÞÛÛÛÛÛÛßß
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ÜÛßÛÛÛÛÛÛÜÛÛÛÛÜÞÛÛÛÛÛÛÛÛ ÞÛ ßÛÛÛÛÛ Ü ÛÝÛÛÛÛÛ Ü
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ÜÛ ÞÛÛÛÛÛÛÛÛÛÛß ÛÛÛÛÛÛÛÛÛ ßÛÜ ßÛÛÛÜÜ ÜÜÛÛÛß ÞÛ ÞÛÛÛÝ ÜÜÛÛ
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ÛÛ ÛÛÛÛÛÛÛÛß ÛÛÛÛÛÛÛÛÛÛÜ ßÛÜ ßßÛÛÛÛÛÛÛÛÛß ÜÜÜß ÛÛÛÛÜÜÜÜÜÜÜÛÛÛÛÛß
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ßÛÜ ÜÛÛÛß ßÛÛÛÛÛÛÛÛÛÛÜ ßßÜÜ ßßÜÛÛßß ßÛÛÜ ßßßÛßÛÛÛÛÛÛÛßß
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ßßßßß ßßÛÛß ßßßßß ßßßßßßßßßßßßß
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ARRoGANT CoURiERS WiTH ESSaYS
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Grade Level: Type of Work Subject/Topic is on:
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[ ]6-8 [ ]Class Notes [Computer Aided Drafting ]
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[x]9-10 [ ]Cliff Notes [and Design (CADD). ]
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[ ]11-12 [ ]Essay/Report [ ]
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[ ]College [x]Misc [ ]
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Dizzed:7/94 # of Words:794 School: ? State: ?
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ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>Chop Here>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄ
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794 CADD
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CADD stands for Computer Aided Drafting and Design. By using the
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computer for the functions normally utilized by hand, a greater amount of
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efficiency can be attained. By drawing lines with a computer on a screen,
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corrections can be made without erasing the entire product. CADD is a lot
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like a word processor, letting people draw whatever they choose, print it,
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and if corrections are needed, only a small amount of time is needed to
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correct it. CADD has the speed of a technical sketch in the accuracy of a
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normal drawing.
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CADD programs can utilize different methods in the way they draw their
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pictures. Some use co-ordinates, which is the standard method, and some
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might use inches or centimetres. The standard method of co-ordinates gives
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a product which is compatible with other systems. One co-ordinate point
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might represent 1/10 of a millimetre in actual space. Then 1 millimetre is
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10 co-ordinate points.
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CADD systems were developed along with the computer. They were
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developed very slowly. They went from being very large, clumsy, elaborate
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machines which needed lots of human intervention to one program on a floppy
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disk. When the power of computers increased, so did the possibilities of
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CADD.
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Images on CADD systems are drawn with the aid of a keyboard, mouse, or
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tracking ball. One selects the starting point of a line, the ending point,
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and the line is drawn. A scale at the bottom of the screen tells how long
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the line will be. On some CADD systems, the computer itself can measure
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how long the line will be while the operator inputs the length of the
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line. Lines are the basis of all drawings. Straight lines are fairly
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simple and quick to make, but what about curved or wavy lines? That's what
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different CADD commands are made for.
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Different CADD commands make different things on the screen possible.
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There are commands for dimensioning, labelling, making circles, boxes, etc.
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Some generic commands and their functions are:
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XYZ up- This allows the operator to rotate, tip, flip, and move the object
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by degrees. Top, front, and rear views are used. Drawing below:
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MOVE- Move means moving the object. Move can be used left, right, up,
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down, forwards, and backwards. MOVE must be specified by how many units
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(co-ordinates) the object must be moved and in what direction.
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SCALE- Makes the object smaller or larger, and by what scale. Eg: reduce
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by 50, increase by 50, etc.
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LINES- This is the generic drawing command for lines. A start point and
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end point must be indicated.
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COLORS- What color the lines or object must be. The foreground and
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backround (in 3-D CADD) can also be specified.
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ERASE- Erase line, object, all, or just a part of the screen, which is
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specified similar to move.
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PLAN VIEW- This command will usuallt draw the 3 views plus a 3-d view of
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the object.
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ZOOM- Zooms in on the object.
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CIRCLE, ARC- Draws the chosen image.
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SPLINE- Draws a "wavy" line as like below.
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TEXT- Writes text.
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COPY- Copies the object, line, etc.
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MIRROR COPY- Copies the object in a mirror image.
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Some commands, like the ones listed below, might not be availible on all
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CADD progarms. They do specific tasks. Some are:
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Hidden line and Surface Removal- Removes hidden lines and surfaces,
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automatically or by the discretion of the operator.
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3 Point Perspective Display- Displays the object in the 3-point
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perspective, as in technical sketching.
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Object and Group Designations- This is usually independent. This
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identifies individual objects on the screen, like a box within a box.
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Move Vertex- Molds and re-shapes objects.
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CADD comes in many forms. 3-D CADD uses lines in a 3 Dimensional form.
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This is useful in drawing complex buildings and spheres.
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CADD output comes in many forms also. Images may be produced by
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printer, which is less accurate, and by plotter, which draws all lines and
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curves by a small pen. This is the most accurate form of CADD reproduction
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and output.
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CADD is widely used in industry. It is slowly replacing all hand
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methods, since it is fast and simple. A drawing that might take 10 days to
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make could now take 10 minutes on computer. The future of CADD depends of
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the demand of the functions for the different programs. CADD in schools is
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being taught also.
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As you can see, CADD is slowly becoming the most widely used system of
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industry in the world. Its functions make design fast and easy, and
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without many errors. Next time you need to finish that drafting project
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and have only a few days left- use CADD- it might surprise you.
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(All commands taken and tested on Generic CADD Level One, Draft Choice
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US Version, Daft Choice Canada, NorthCAD, and NorthCAD 8:3-D.)
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