[email protected] engr-22_lec-04_2d_construction-2.ppt 1 bruce mayer, pe engineering 22 –...

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Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engineering 22

AutoCADAutoCAD©© 2D 2D

Construction-2Construction-2



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 Element to construct more Complex 2D Shapes



Last TimeLast Time

Line Construction Line Circle Circle Center Lines PolyLines Spline Ellipse Erase



RECTANGLE CommandRECTANGLE Command The RECTANGLE

command draws a rectangle whose sides are vertical and horizontal. • The position and size

of the rectangle are defined by picking two diagonal corners

A very Easy to use Command

To Invoke the Rectangle Command• PullDown Menu:

Draw → Rectangle

• The Tool on the Drawing ToolBar

• Command Line: RECTANGLE or REC or RECTANG



POLYGON CommandPOLYGON Command The Polygon

command can be used to draw any REGULAR polygon from 3 sides up to 1024 sides

POLYGON Requires 4 User Inputs1. number of sides

2. a pick-point for the polygon center

3. whether the polygon is inscribed or circumscribed

4. a pick point which determines both the radius of this imaginary I/C circle and the orientation of the polygon



POLYGON CommandPOLYGON Command To Invoke the

Polygon Command• PullDown Menu:

Draw → Polygon


• Command Line: POLYGON or POL

• Inscribed Heptagon– 2” R

• Circumscribed Heptagon– 2” R



POINT CommandPOINT Command The POINT

command inserts a point marker in the drawing at a position which you pick in the drawing window or at any co-ordinate location which you enter at the keyboard.

The default point style is a simple dot This is often difficult

to see The point style Can

Be Changed to something more easily visible or elaborate using the point style dialog box.



POINT CommandPOINT Command To Invoke the Point

Command• PullDown Menu:

Draw → Point


• Command Line: POINT

To Change the Point Shape Activate Point Style Dialog box• PullDown Menu:

Format → Point Sytle...

• Command Line: DDPTYPE



POINT StylePOINT Style The Point Style

Dialog box • Default Point Style

• Fine-Tuned Point Style



TEXT CommandTEXT Command The TEXT

command inserts a SINGLE LINE of Text into the dwg

To Invoke the TEXT command• PullDown Menu:

Draw → Text → Single Line Text

• Command Line: TEXT

Text Inserts Text at

Mouse Pick-Point Always

Expects another Line

Command: textCurrent text style: "Standard" Text height: 0.0000Specify start point of text or [Justify/Style]:Specify height <0.2000>: .3Specify rotation angle of text <0>:Command:Command:Command: *Cancel*



MTEXT CommandMTEXT Command The MTEXT

command inserts a BOX in Which Multiple Lines of Text are Placed

To Invoke the MTEXT command• PullDown Menu:

Draw → Text → Mulitline Text

• Command Line: MTEXT

The Tool on the Drawing ToolBar

Inserts a “Rectangle-Like” Text Box, along with the Text Formatting DiaLog Box



MTEXT ExampleMTEXT Example

Form MultiLine Box by Dragging Corners

Text formatting Box Invoked Automatically by MTEXT command



Text OptionsText Options MText Turns on the

Text Formatting Dialog Box

DText (Dynamic text) Invokes Command Line Options:

Command: dtextCurrent text style: "Standard" Text height: 0.3000Specify start point of text or [Justify/Style]: jEnter an option [Align/Fit/Center/Middle/Right/TL/TC/TR/ML/MC/MR/BL/BC/BR]:

Justification Examples



Editing/Tuning CommandsEditing/Tuning Commands

Move

Copy

OffSet

Mirror

• VERYUseful



Editing/Tuning Commands Editing/Tuning Commands contcont

Array

Rotate

Trim

Extend



Editing/Tuning Commands Editing/Tuning Commands contcont

Break

Chamfer

Fillet

Table



All Done for TodayAll Done for Today

Its Fill-Lĕt,NOT

Fill-Lāy



Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engr/Math/Physics 25

AppendiAppendixx

6972 23 xxxxf



Break CommandBreak Command

Command: breakSelect object: quadofSpecify second break point or [First point]: neato

Breaks CCW



DemoDemo

Open AcadIso.dwg Set Limits: 297, 210 Grid/Snap: 5/1 Make Obj layer

• Magenta & Cont.

Draw Obrnd Slot• 4 dia, 10 ctr-to-ctr

Array slot• 3x5

Rotate Middle Slot by -37 deg• Use Line-mid



Demo - 2Demo - 2

Draw Rectangle Above, & Polygon below the slanted Slot

Extend the slot sides to the rect & ellipse

Break Ell with Break Command• Use First Point

Option

Stretch Col-5 Slots to Right• Try withOUT & With

CROSSING option

For the Previously Drawn Rectangle for 2 corners each• Chamfer – 2.7

• Fillet – 4.3– ReFillet to 0



Demo - 3Demo - 3

Make Table• 3 x 2

• Col width = 13

• Txt ht = 3

[email protected] engr-22_lec-04_2d_construction-2.ppt 1 bruce mayer, pe engineering 22 –...

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