978-1-58503-369-0 -- AutoCAD LT 2008 Tutorial

Randy Shih

Description

®AutoCAD LT 2008 Tutorial Randy H. Shih Oregon Institute of Technology SDC PUBLICATIONS Schroff Development Corporation www.schroff.com www.schroff-europe.com ® AutoCAD LT 2008 Tutorial 1-1 Lesson 1 Geometric Construction Basics Copyrighted Material Copyrighted Material Copyrighted ♦ Create and Save AutoCAD Drawing FilesMaterial ♦ Use the AutoCAD LT Visual Reference Commands ♦ Draw, Using the LINE and CIRCLE ♦ Use the ERASE Command ♦ Define Positions Using the Basic Entry Methods Copyrighted ♦ Use the Pan Real-time Option Material ®1-2 AutoCAD LT 2008 Tutorial Introduction Learning to use a CAD system is similar to learning a new language. We need to begin Copyrighted with the basic alphabet and learn how to use the basic alphabet correctly and effectively through practice. This will require learning some new concepts and skills as well as learning a different vocabulary. All CAD systems create designs using basic geometric entities. Most of the constructions used in technical designs are based upon two-Material dimensional planar geometry. The method and number of operations that are required to accomplish the construction are different from one system to another. In order to become effective in using a CAD system, we must learn to create geometric entities quickly and accurately. In learning to use a CAD system, lines and circles are the first two, ...

Informations

• Publié par: Sogoz
• Nombre de lectures: 62
• Langue: English

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AutoCAD LT ® 2008 Tutorial

Lesson 1  Geometric Construction Basics 

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♦Create and Save AutoCAD Drawing Files ♦  Use the AutoCAD LT Visual Reference Commands ♦  Draw, Using the LINE and CIRCLE Commands ♦  Use the ERASE Command ♦  Define Positions Using the Basic Entry Methods ♦  Use the Pan Real-time Option    

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1-2 AutoCAD LT ® 2008 Tutorial

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I w L  n it e t a h r nr t o ni h d g e u a t b c s o t i u i c s o la e n a p   C sDCA habeta o  y learnd itsme p nhowt lisims y eo t  o u  s lar r the earn i aing b  aisc g ne ba alw lahp h t g ecro augn t .eeW ctrely e endf dee a tn d eg ecfvit bo   in eyl ractice. This wi re learn t l e d h e i n r a t m o i r t n e u i i e n g n s s h . g i    o p a M n  a d o l i s  f t p f  l e o a r f n e t a n h r t e    v g c e o o o c n a m s b l t e l r u t  u l r r a e c y r . t q  i y M . tem l e l h A T A e C on iu uss a adoh sgin i D d y ten s  t ndn  i me nhc o c smste u e s  e c d t e a wn la r r m e be c r i o e n ds s  n e g oof ec i i  ngs ratpe a a r  e s b tp a s t uni nos d i g ksdn ase l sll up i ba hta   sicetrigeom rqeae  r c asewllas eriuotd ow-ont accomplish the construction are different from one system to another.  entities quickly and accurately. In learning to use a   CAD system,linesandcirclesare the In order to become effective in using a CAD system, we must learn to create geometric first two, and perhaps the most important two, geometric entities that we need to master t t s s h e p e c e l e  i h  s n t n h k e i i a s c l  t l a  c s t l  a  r i i d n n a  e  n b s c i e g r g  l e c e n a o s t s  i . n a  C struct  o e a p ng l  n n d d exnaI o d y by m co a if  od ogs y n gniinm p npla nne er c n t g in i fideht St. y f a a c r r  nere fig ht t igra g r siw r t esu einl type i hd   d fi na n of u s  ob s g r ef plana selcric ntre de r dyb h era egmoe ad. s   ii i u art t i t r   g e c hn e li t din wA se s e nit osalm ags e ni Es.ll ,seit d emo i l p al e e w s  t s  c   nad na g c e i e x r o p cl e m e ri e s e t i r n i n c c   e A i e u n n t t i o it cr C se ea A .I ti D n n  g L t l h T ni i  s 2 se l 0 e 0 a ss 8 o . n M ,nwwe crid  escl a si, xeli m  i l t nie prr m  a la e ht u e dec  o d r ser eri c f  f i tw b e  n na a ysoa paep l le c i  d f   eotherotcerta ndasenilgnitaer   Starting UpAutoCAD LT 2008     1.  Select theAutoCAD LT 2008option on theProgrammenu or select the AutoCAD LT 2008icon on theDesktop. Once the program is loaded into memory, theAutoCAD LT 2008  drawing screen will appear on the screen.  

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Geometric Construction Basics 1-3

 radnwi otN t   eh g t nisu C g efa t d a e A h  ras tu e o tomaTautiDALCo munysteltsunadtis etaeI.drcamnourex r ple, llyca sas i ehtrd  A n  g s d n e giss i a tuCoD n A e  g h a n gniw Tpo cire L t s,mea h man t e nede D D e r r g a a r w a w i d p in n h g i g c X 1 s .   wi as,ewn  wodn e

  Drawing Unit o s Set p up yr g e  t E h v e e  r v y a  l o u b e j  e o c f t t  h w e e   u c n o it n s s  tr w M nitcua thnhiit a AD CA C e t sy s D te t y s s e mi e s b m   me r s er a o e f i a u e e r r ct di a  in nu g n t l i h t e s s.etntieioeemrtci W f e i s rst .   g ddehoulineterm     1.  In the pull-down menus, select: [Format][Units]      hted      rial 

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1-4 AutoCAD LT ® 2008 Tutorial

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2.ehnIt ehmet D as r u a r w e i m n e g nt U t n o i  t t s h ,xob d g e o e l  ehttes silgu  hluafnEt diaL ni e t n s, g  t i h n  c T h y e p s. e  h toDe t cimal e . This d will s   et rial

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hted  ial 3.  Set thePrecisiontotwo digits  a after the de e cimal r point as shown in the above  4.  PickOKto exit theDrawing Unitsdialog box.     Drawing Area Setup  N w e o xt, i  n w g e   a w re il a l .   s It e  t c u C ana e ols thpD o b r e a u w s i e n p d g t  o L p i r m e y i v t e ss; tn r enit c t nos i i gt t he urtc g o D n r o a r u  w t e i f s h n re id g e e  n L t i h c t e m e i t t g h s dir at c e rtlo m s ilsti no smark d ht dnaa the e   s a extents of the display of thegrid. It also serves as a visual rk t p h lo e t r o eg p i ti o o n n f t o h r at g  e d o ef m in et e r s y   a c n o a n r s e tr a u t c o t  i b o e n  . p  lotted/pri  nt e ed. No r te t i hat th a is set l ting   does not limit  1.  In the pull-down menus, select: [Format][Drawing Limits]          ighted     erial

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ted    TheZoom Allcommand w a ill ad t just t e he dis r play so th a at all l objects in the drawing are displayed to be as large as possible. If no objects are construct   ed, theDrawing Limits  are used to adjust the current viewport.

coordinates <12.00,9.00>.

2. t c I < h o n 0 o e t C . r  h 0 e m d 0  i e , c n 0 o a s . t s 0 m e a o 0 m g  e s > < a  : “ ” 0 n R  . d i e 0 s s p p 0 e d r , t i o  0 s . M m p 0 l o p a 0 t y d  y > e a e . l r d   e . S a p , P r  a n re c s e e s a  i r L t i h h t m e e i  t E g b s: n ot t S t e p o r e m c k h  i o e f y y f  t l h o e t w t r u e Ao el e rn DAC oc   L tf d er Td o r r a   [ w O i n n / g O s f c f] r  een, once to accept the default

Geometric Construction Basics 1-5

t   he ENTER key once to accept the default message “Specify upper right corner d 4.  On your own, move the graphic cursor near the upper-righ   t comer inside the  drawing area and note that the drawing area is unchanged. (TheDrawing Limits  command is used to set the drawing area; but the display will not be adjusted until a display command is used.)    5.  In the pull-down menus, select: oom][All]  [View][Z ted al

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a,rehetmorpatpmmocdna <0 theIn  3. deyalpsisserP.000.0,.0dis”>:

1-6 AutoCAD LT ® 2008 Tutorial

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Using theInfoCenterto Get More Information  Prior to creati C ng geo o metric o p bjects, y let’s r exa i mine t g he usa h ge of t t he In e foCent d er opt   ion to obtain some help on the subject.  1 t .  Ty e peDr r aw  i in the a  Inf r o e l l C a e t n e t d e i r n i f n o p r u m t a b ti o o x  to n  . search for anyDraw    2.  ClickDraw Geometric Objectsin the AutoCAD LT Helplist as shown.      3 i .  t I a G h n r g e u e t   i d h c d e o e e, s  n A c g r st u i e h r t b u n o e c e C it . a d r A o l  t D n i  s n L o fo T r f   e 2 m g 0 a oe 0 ti 8 m o  e n U t d r s i er e c r g ’ o a s b r    ng j d e i cts  4. e  L C m i li o n c r e k e a i r D n  f O r o a b r j w m e  c a L t t s i oi . n n e  a o r n     O ho b w je t c o t c s  ot ur t t e c g ston      5.  On your own, clickDraw Linesand i  t t • h h  g  O Ae neL n u i t n y o o eotvi   ow ADC  ur t  e ,   r w TL n L e t i a h e n d e e r c t d r e h s mo c o d h iptio hgt nam u   e   onf .d descriptions listed inConcepts, er Proc Rfee i c edu rne a e re . n  ,a l dQ   uick  Drawing Lines with theLineCommand   1.  Move   the graphics cursor to the first icon in  the  Lineicon. Ahelp-tipbox appears next to t r he2 i D Draw and h modi t fypan e el. Thi d s ico   n is  g the cursor.    2.  t Select e the ic r on i by cli a cking l once with theleft- mouse-button, which will activate theLine  command. 

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Geometric Construction Basics 1-7

3.In the rea nea en, the message “_line Specify first point:” is displayed. AutoCAD expects us to ide C hty ocm fitn o arti nad ts m e p ocangl tprpmo y tion , o a r f a i iag er s t r h t g .en bo h m t ot i t l h e  v f o o M   eht t ot g u  A e  ht e i D p C h A ar  c d a c w us dr  i rs   htedie rescgn nsior graphics window and watch the display of the coordinates of the graphics cursor at the bottom of the AutoCAD  drawing screen.The two numbers represent the location of the cursor in the X and Y directions. We can treat the graphics window as if it was a pie M ce of pa a per a t nd we e are u r sing i the g a raph l ics   cursor as if it were a pencil with which to draw.    

Coordinates of the location of the graphics cursor.

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    2    We will create a freehand sketch of a five- point star using theLine  command. Do not be overly concerned with the actual size or the accuracy of your freehand sketch. This exercise is to give you a feel 4  ghted for theAutoCAD LT 2008user interface.    rial 4.  We will start at a location near the bottom of the graphics window. Left-click once to position the starting point of our first line.     hted     two numbers, displayed next to the cursor, represent the current cursor position.The Note that the same two numbers are also displayed at the lower left corner of the option. Tooltips are M display a ed ne t ar the e curso r r, w i hich a are d l yna   mically updated as the AutoCAD main window. The displaying of tooltips is known as theDynamic Input  cursor moves.

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