Autocad 2d Module 12 PDF

8/14/2019 Autocad 2d Module 12 PDF

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Learning Outcomes:

AutoCAD Self-paced Learning Modules

AutoCAD 2DModule 12

Fillets

When you have completed this module, you wil l be able to:

1. Describe tangency and a fillet.

2. Describe and apply the FILLET command to construct objects that contain tangent arcsand the LINE command with the aid or the object snap mode tangent to draw linestangent to arcs.

Geometry Lesson

Tangency - Part 1

Apoint of tangency is thetheoretical point where a line

joins an arc or where two arcsjoin each other making asmooth transition. A linepassing a circle will hit onepoint on the circle. StudyFigure 12-1.

Afilletis a tangent arc. Thereare four examples in the figureon the right.

Figure 12-1

...continued on page 12-2

Fillets

Tangency

The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
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12 - 2 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12

Tangency - Part 1 - Continued

AutoCAD uses the FILLET command to construct fillets. A fillet is a tangent arc. To help

you understand the geometry of how a fillet is constructed, study the diagrams below. Theyshow how a tangent arc is constructed between two existing lines. As you work your way

through the modules, there will be many other examples of fillets and tangency.

Figure 12-2

Fillets

A fillet is a tangent arc. To construct a fillet, you use the FILLET command.

The rule of thumb to follow is "If the arc you are drawing is tangent to bothobjects it is connecting to, then use the FILLET command. If the arc istangent to one or neither of the objects, use the ARC command.

Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12


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AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12

AutoCAD Command: FILLET

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The FILLET command is used to draw a tangent arc. It inserts an arc tangent to the two objectsselected by the user.

Shortcut: F

2004-2008

2000-2002

Using the FILLET Command

Step 1 Start a new drawing using the template Module Template A.

Step 2 Save and name the drawing AutoCAD 2D Workalong 12-1.

Step 3 Create layer Object and Construction as

shown in Figure Step 3.

Figure Step 3

Step 4 Set layer Object as the current layer andenter the LINE command shown below to drawthe object as shown in Figure Step 4.

Object to be DrawnCommand: L

Specify first point: 6.5,4Specify next point or [Undo]: @0,4

Specify next point or [Undo]: @-1.3,0Specify next point or [Close/Undo]: @0,-1.2Specify next point or [Close/Undo]: @-2.4,0

Specify next point or [Close/Undo]: @0,1.2Specify next point or [Close/Undo]: @-1.3,0Specify next point or [Close/Undo]: @0,-4Specify next point or [Close/Undo]: CCommand:

..continued on page 12-4

Fillets

Figure Step 4

The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
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Using the FILLET Command - Continued

Step 5 Enter the FILLET command shown below to fillet the top corners of the object as

shown in Figure Step 5.

Command: FILLET

Current settings: Mode = TRIM, Radius = 0.6000Select first object or [Polyline/Radius/Trim]: RSpecify fillet radius : .25

(Set the radius for the fillet.)

Select first object or [Polyline/Radius/Trim]: P1Select second object: P2

(Pick the two lines to insert the fillet between.)

Command: FILLETCurrent settings: Mode = TRIM, Radius = 0.2500

(Notice how AutoCAD remembers the fillet radius. It onlyneeds to be changed if the radius changes.)

Select first object or [Polyline/Radius/Trim]: P3

Select second object: P4

Step 6 Enter the FILLET command shown below to fillet the

inside corners of the object as shown in Figure Step 6.

Command: FILLET

Current settings: Mode = TRIM, Radius = 0.2500Select first object or [Polyline/Radius/Trim]: RSpecify fillet radius : .35

(Set the radius for the fillet.)

Select first object or [Polyline/Radius/Trim]: P5Select second object: P6Command: FILLETCurrent settings: Mode = TRIM, Radius = 0.3500Select first object or [Polyline/Radius/Trim]: P7Select second object: P8

Command:

Step 7 Save and close the drawing.

Object Snap Modes for all Objects

Figure Step 5

Figure Step 6

CompletedDrawing

Mode

Tangent

Abbreviation

Tan

Icon Marker The AutoCAD Object



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Drawing Tangent Lines

Step 1 Start a new drawing using the template Module Template C.


Step 3 Create layer Object and Construction asshown in Figure Step 3.

Step 4 Enter the CIRCLE and LINE commands

shown below. Your object should now appear asshown in Figure Step 4.

Command: CIRCLE Figure Step 3

Specify center point for circle or [3P/2P/Ttr (tan tanradius)]: 10,10Specify radius of circle or [Diameter] : 2

(This is a construction circle, place it on the construction layer.)Command: CIRCLE

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: @4


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Drawing Tangent Lines - Continued

Step 5 Draw tangent lines between the circles. See

Figure Step 5.

Command: LINE Specify first point: tan ofP3

Specify next point or [Undo]: tan ofP4(Notice how you have to entertan to both ends of the line.

It is a very common error to forget to enter it at the secondend. Don't use Autosnap, type tan on the keyboard andthen press enter.)

Command: LINE Specify first point: tan ofP5Specify next point or [Undo]: tan ofP6Command: LINE Specify first point: tan ofP7Specify next point or [Undo]: tan ofP8Command: LINE Specify first point: tan ofP9Specify next point or [Undo]: tan ofP10Command: FILLETCurrent settings: Mode = TRIM, Radius = 0.0000

Select first object or [Polyline/Radius/Trim]: RSpecify fillet radius : 2Select first object or [Polyline/Radius/Trim]: P11Select second object: P12Command:

Step 6 Freeze layer Construction.

Step 7 Draw fillets between the lines as shown in Figure

Step 7A. Your completed drawing should now appear asshown in Figure Step 7B.

Command: FILLET

Current settings: Mode = TRIM, Radius = 2.0000Select first object or [Polyline/Radius/Trim]: R

Specify fillet radius : 3Select first object or[Polyline/Radius/Trim]: P13Select second object: P14

(Construct a 3 R fillet between

the lines at the bottom of theobject.)

Command:

Step 8 Save and close the

drawing.

Figure Step 7B

Figure Step 5

Figure Step 7A

Completed Drawing



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Drawing Construction Techniques

Step 1 Start a new drawing using the template Module Template A.


Figure Step 3

Step 3 Create layer Object and Construction asshown in Figure Step 3.

Step 4 On layer Construction, enter the LINE

command shown below to start construction ofthe object. See Figure Step 4.

Object to be Drawn

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Command: LSpecify first point: 1.5,4.5Specify next point or [Undo]: @5,0Specify next point or [Undo]: @0,2

Specify next point or [Close/Undo]: @-1.5,0Specify next point or [Close/Undo]: @0,2Specify next point or [Close/Undo]: @-2,0Specify next point or [Close/Undo]:

(Stop here and re-start at the start point.)Command: L

Specify first point: 1.5,4.5Specify next point or [Undo]: @0,4 Figure Step 4

(Since you don't know the length of the line, draw a line of any length in the correct direction.)Specify next point or [Undo]:

Step 5 On layer Construction, enter the LINE command shown below to continue

construction of the object. See Figure Step 5.

Command: L

Specify first point: (end) P1

Specify next point or [Undo]: @2


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Drawing Construction Techniques - Continued

Step 6 Draw fillets with zero radius to create a perfect

corners. See Figure Step 6A and 6B.

Command: FILLET

Current settings: Mode = TRIM, Radius = 0.3500Select first object or [Undo/Polyline/Radius/Trim/Multiple]: RSpecify fillet radius : 0

(Set the radius to zero. See User Tip on page 12-9.)

Select first object or [Undo/Polyline/Radius/Trim/Multiple]: P3

Select second object or shift-select to apply corner: P4Command: F

(F is the shortcut for the command FILLET.)Current settings: Mode = TRIM, Radius = 0.0000Select first object or [Undo/Polyline/Radius/Trim/Multiple]: P5Select second object or shift-select to apply corner: P6Command:

Step 7 Select the lines that you want to be changed tolayer Object. Pull-down the layer pull-down toolbar andselect the name Object as shown in Figure Step 7.

Figure Step 7

Step 8 Freeze layer Construction.

Step 9 Save and close thedrawing.

Completed

Drawing

Fillets The CAD Guys Ltd. Copyright 1993 - 2007

Figure Step 6A

Figure Step 6B

Figure Step 8

Module 12


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By setting the radius of theFILLET command to zero,the FILLET command willsquare the lines to make aperfect corner. The lines

can be too short or too long or a combinationof the two as shown in the figure on the right.

BEFORE AFTER

If you want to insert an arc at the end of parallel lines, use the FILLET

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command. Regardless of what radius is currently set, AutoCAD will draw atangent arc using the distance between the lines as the radius. The linesdo not have to be the same length.

Command: FILLET

Current settings: Mode = TRIM, Radius = 0.0(Notice how the radius is set to zero. It can be any size.)Select first object or [Polyline/Radius/Trim]: P1

(The first line you pick will retain it's original length and the second one will be trimmed orextended.)

Select second object: P2Command

BEFORE AFTER

The Key Principles in Module 12

1. A point of tangency is the theoretical point where a line joins an arc or where two arcs

join each other making a smooth transition.

2. A fillet is a tangent arc. To construct a fillet, you use the FILLET command. The rule of

thumb to follow is "If the arc you are drawing is tangent to both objects it is connecting

to, then use the FILLET command. If the arc is tangent to one or neither of the objects,use the ARC command.

3. Use the tan object snap mode to draw lines tangent to two circles or arcs. Make sure

you apply it on both ends of the line.

4. By setting the radius of the FILLET command to zero, the FILLET command will square

two lines to make a perfect corner.

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Lab Exercise 12-1

Drawing Specifications

Time Allowed: 30 Min

Name Template Units Text Style Font

AutoCAD 2D Lab 12-1 Module Template A Inches N/A N/A

Note: Color, Linetype, and Lineweight are all < ByLayer< unless otherwise instructed.

Layering Scheme

Objects on Layer Name Color Linetype Lineweight

Construction Objects

All Objects

Instructions:

Construction

Object

253

Red

N/A

N/A

N/A

N/A

1. Setup the layers using the Layering Scheme shown above.2. Draw the object shown below using the layering scheme above.3. Draw all construction objects on layer Construction.4. Check your drawing with the key.

5. If you have any errors, correct your drawing.6. Turn layer Key off and freeze layer Construction.7. Save and close the drawing.

Completed

Drawing



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Construction Techniques

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The following steps are the construction technique suggested by the author to help you learn

how to construct objects using AutoCAD. It is only the suggested method and if you cancomplete the drawing accurately using a different construct technique, that is what is important.You may want to compare your construction technique with the authors.

Construction Hints

Do your best to complete the lab exercise drawing without

using the following hint(s). If you get stuck and can'tcomplete it on your own, use the following hint(s) to helpyou.


Hint 1

The dashed line shown in the dimensioned drawing,indicates that the lines should be constructed tangentto the small circle from the circles on either end of theobject. After the lines are inserted tangent to bothcircles, you can then insert the fillet.

Figure Hint 1



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Lab Exercise 12-2

Drawing Specifications

Time Allowed: 30 Min.

Name Template Units Text Style Font

AutoCAD 2D Lab 12-2 Module Template A4 Millimeters N/A N/A

Note: Color, Linetype, and Lineweight are all < ByLayer< unless otherwise instructed.

Layering Scheme

Objects on Layer Name Color Linetype Lineweight


All Objects

Instructions:

Construction

Object

253

Red

N/A

N/A

N/A

N/A

1. Setup the layers using the Layering Scheme shown above.2. Draw the object shown below using the layering scheme above.3. Draw all construction objects on layer Construction.4. Check your drawing with the key.

5. If you have any errors, correct your drawing.6. Turn layer Key off and freeze layer Construction.7. Save and close the drawing.

CompletedDrawing



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Construction Techniques

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The following steps are the construction technique suggested by the author to help you learn

how to construct objects using AutoCAD. It is only the suggested method and if you cancomplete the drawing accurately using a different construct technique, that is what is important.You may want to compare your construction technique with the authors.

Construction Hints

Do your best to complete the lab exercise drawing without using the following hint(s). If you get stuck and

can't complete it on your own, use the following hint(s) to help you.

Hint 1

Draw a construction line from the midpoint of the line

across the bottom of the slot 95 units in the positiveY direction. Then draw a circle with its center at theend of the line. See Figure Hint 1

Figure Hint 1

Hint 2

Since you don't know the exact length of the lines shown in

Figure Hint 2, draw them any length but in the correct direction.When you insert the fillets, the line will automatically betrimmed.

Figure Hint 2


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