Date post: | 17-Jan-2016 |
Category: |
Documents |
Upload: | gordon-scott |
View: | 219 times |
Download: | 0 times |
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt1
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Bruce Mayer, PELicensed Electrical & Mechanical Engineer
Engineering 22
AutoCADAutoCAD©© 2D 2D
Construction-1Construction-1
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt2
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Learning GoalsLearning Goals
Become Proficient with invocation of AutoCAD Drawing Commands
Create Basic AutoCAD 2-Dimensional Drawing Elements • e.g.; Lines, Circles, Ellipses and PolyGons
Use a Combination of ACAD 2D Elements to construct more Complex 2D Shapes
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt3
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Initiating AutoCAD CommandsInitiating AutoCAD Commands Generally There are
Three Ways to Invoke AutoCAD commands
Example – Draw a Circle
1. By PullDown Menu
If you get “Stuck” in ACAD
Try the ESCAPE Key
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt4
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Invoke Commands Invoke Commands contcont
2. By Typing the Command into the Command line
The Typed Commands often have ShortCuts Instead of typing
circle, type only c
3. Using a Tool from a ToolBAR
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt5
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Drawing LinesDrawing Lines To Random Points
• Type in line (or l), or click the Line Tool
• Pick PointsUsing the Mouse – The Line follows the mouse.
• Click at each vertex
• Terminate Line by Hitting Enter or Esc
Many times these “Assisters” Help with Line Drawing• SNAP
• GRID
• ORTHO
• OSNAP
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt6
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Random Pts LineRandom Pts Line
• This Example uses SNAP and GRID, but NOT Ortho
Mouse Click Sets Vertex
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt7
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Closed LineClosed Line To Make a
CLOSED figure of an arbitrary shape1. Invoke line and set
at least 3 Vertices
2. With Line still ACTIVE type in the command-line one of:– close
– c
Line Ready to Close
Closed Line
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt8
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
ErasingErasing To delete drawing
elements use the Erase command
Invoke Erase by• PullDown Menu
• Click the Erase Icon on the Modify ToolBar
• Type in Command line erase or e
To Erase:
• Start Erase• Select Element(s)
with Mouse• Hit Enter or RIGHT
Click
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt9
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Line by CoordsLine by Coords Type in the
Command Line the CoOrds, one at a time
Be Sure That “Dynamic Input” is Turned OFF
Make a Box
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt10
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Line by Relative CoOrdLine by Relative CoOrd To Draw a Line
RELATIVE to a Given point
Invoke the line command
ID a Starting point with the Mouse or by CoOrds
In the command Line Type Either
• @ x, y– x & y are CoOrds
RELATIVE to the Current Point
• @ dist, <angle– The distance and
angle (in Degrees, thakfully) Relative to Current Point
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt11
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Relative LinesRelative Lines By X & Y By Distance &
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt12
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Construction LinesConstruction Lines Construction Lines
are Very Useful for “Blocking In” or “Aligning” Drawing Objects
They are lines of Infinite (h) Length that may be trimmed later
Invoke Construction Line by• Construction Line
Tool on Drawing Tool Bar
• Command line → xline or xl
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt13
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Some Construction LinesSome Construction Lines
Construction Line Options
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt14
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Construction Line OffsetConstruction Line Offset
Lets• Make a Layer; Green
in Color
• Draw some Lines
• Offset a Construction Line
Hit ENTER twice to ReInvoke ConstrLn
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt15
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Drawing CirclesDrawing Circles To Draw a circle
Invoke the Command• Click the Circle Tool
• Use the PullDown Menu: Draw → Circle → option
• Type in the Command Line one of– Circle or c Command Line Text
Command: circleSpecify center point for circle or [3P/2P/Ttr (tan tan radius)]: 2p
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt16
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Drawing Circles Drawing Circles contcont
To Draw a Simple Circle1. Click the Circle Tool
2. Use the Mouse to Pick a Center Point
3. Do one of – DRAG with the
mouse to Set the Radius
– Type in a Number for the radius
Circle by• Pick Center Point
• Drag Radius
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt17
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Drawing Circles Drawing Circles contcont
The Circle Command has Many useful options
Default → Center, Radius
Center, Diameter
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt18
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Drawing Circles Drawing Circles contcont
2 Points Tan, Tan, Tan
Start Pt
Tan, Tan Radius
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt19
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Circle Center Marks/LinesCircle Center Marks/Lines Technical Drawing
Practice Calls for Marks and Lines to ID Circle Centers
CenterMark Sizing
Center MarkOnly
Center Mark & CenterLines
ACAD has many Commands and Parameters that Can ONLY be accessed thru the Command Line
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt20
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
SETVAR commandSETVAR command Typing SetVar in the
Command Gives access to 480 AutoCAD System Variables
Partial Listing bySetvar → ? → *
For Example, The acad.dwt has a Center mark Size of 0.09”
Use Variable DIMCEN to Change to 5X this Value
Note: Can type DIMCEN w/o SetVar
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt21
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
CenterLines by Dim StyleCenterLines by Dim Style The acad.dwt
default for Circle Center is a MARK only; NO Lines
To Change, use Dimension Styles
Invoke the Dim Style Dialog by one of
• Dim Style Tool on the Dimension ToolBar
• PullDown Menus: Dimension → Dimension Style...
• Command Line → DIMSTYLE
Any of these actions Activates the Dim Style Dialog Box
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt22
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
CenterLines by Dim Style CenterLines by Dim Style contcont
The DimStyle Dialog Box
Select Modify... To activate next dialog
• Select the Symbols and Arrows Tab
Check this Button to Produce CntrLns
Can Use Instead of DIMCEN
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt23
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
CenterLines by Dim Style CenterLines by Dim Style contcont
After the change A new Circle
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt24
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
POLYLINE CommandPOLYLINE Command The PLINE
command allows you to create "grouped" objects that can be extruded, given line width on the screen, and can contain arc segments.
To Invoke the PolyLine Command• PullDown Menu:
Draw → Polyline
• The Tool on the Drawing ToolBar
• Command Line: pline or pl
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt25
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Polyline ConstructionPolyline Construction
PolyLines Are Constructed using the same methods as “Regular” Lines, but the WIDTH of the Line is VARIABLE
PLINE also has a List of OPTIONS
[Arc/Halfwidth/Length/Undo/Width]• Width and Halfwidth Set the Starting & Ending PolyLine width(s)
• Arc Helps Fine Tune PLine Arcs
• Length allows typing of the Next Segment Length
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt26
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Some PolyLinesSome PolyLines
Command: plineSpecify start point:Current line-width is 0.2000Specify next point or [Arc/Halfwidth/Length/Undo/Width]: hSpecify starting half-width <0.1000>: .05Specify ending half-width <0.0500>:Specify next point or [Arc/Halfwidth/Length/Undo/Width]:Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: *Cancel*
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt27
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Some PolyLines Some PolyLines contcont
PLINESpecify start point:Current line-width is 0.1000Specify next point or [Arc/Halfwidth/Length/Undo/Width]: wSpecify starting width <0.1000>: 0Specify ending width <0.0000>: 1.2Specify next point or [Arc/Halfwidth/Length/Undo/Width]:Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: *Cancel*
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt28
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Some PolyLines Some PolyLines contcont
Command: plPLINESpecify start point:Current line-width is 1.2000Specify next point or [Arc/Halfwidth/Length/Undo/Width]: hSpecify starting half-width <0.6000>: .05Specify ending half-width <0.0500>:Specify next point or [Arc/Halfwidth/Length/Undo/Width]: aSpecify endpoint of arc or[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: *Cancel*
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt29
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
SPLINE commandSPLINE command A spline is a smooth
curve that is fitted along a number of control points
The ACAD Spline command creates a type of spline known as a NonUniform Rational B-Spline, NURBS for short
To Invoke the Spline Command• PullDown Menu:
Draw → Spline
• The Spline Tool on the Drawing ToolBar
• Command Line: spline or spl
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt30
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
SPLINE ConstructionSPLINE Construction
Splines Are Constructed using the same methods as “Regular” Lines, but the segments are splined arcs
Command: splineSpecify first point or [Object]:Specify next point:Specify next point or [Close/Fit tolerance] <start tangent>:Specify next point or [Close/Fit tolerance] <start tangent>:Specify next point or [Close/Fit tolerance] <start tangent>:Specify next point or [Close/Fit tolerance] <start tangent>:
Specify start tangent: *Cancel*
• Constructing a Spline
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt31
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
ELLIPSE commandELLIPSE command The Ellipse
command includes a number of different creation options. • The default option is
to pick the two end points of an axis and then a third point to define the eccentricity of the ellipse.
To Invoke the Ellipse Command• PullDown Menu:
Draw → Ellipse
• The Ellipse Tool on the Drawing ToolBar
• Command Line: eLLipsE or EL
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt32
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
ELLIPSE ConstructionELLIPSE Construction
Command: elELLIPSESpecify axis endpoint of ellipse or [Arc/Center]:Specify other endpoint of axis:Specify distance to other axis or [Rotation]: *Cancel*
ELLIPSESpecify axis endpoint of ellipse or [Arc/Center]: aSpecify axis endpoint of elliptical arc or [Center]:Specify other endpoint of axis:Specify distance to other axis or [Rotation]:Specify start angle or [Parameter]:Specify end angle or [Parameter/Included angle]:
ELLIPSESpecify axis endpoint of ellipse or [Arc/Center]: cSpecify center of ellipse:Specify endpoint of axis:Specify distance to other axis or [Rotation]: <Ortho on> <Ortho off>
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt33
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
PolyLines & EllipsesPolyLines & Ellipses
Let’s Draw some of the Elements that have many Options• PolyLines
• Ellipses
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt34
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
All Done for TodayAll Done for Today
Not a CAD Circle But aBoat Circle
[email protected] • ENGR-22_Lec-0_2D_Construction-1.ppt35
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Bruce Mayer, PELicensed Electrical & Mechanical Engineer
Engr/Math/Physics 25
AppendiAppendixx
6972 23 xxxxf