Download - Autocad 2d Module 12 PDF
-
8/14/2019 Autocad 2d Module 12 PDF
1/13
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
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
2/13
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
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
3/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
AutoCAD Command: FILLET
12 - 3
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
http://www.abbyy.com/buyhttp://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
4/13
12 - 4 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
5/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Drawing Tangent Lines
Step 1 Start a new drawing using the template Module Template C.
Step 2 Save and name the drawing AutoCAD 2D Workalong 12-2.
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
-
8/14/2019 Autocad 2d Module 12 PDF
6/13
12 - 6 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
7/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Drawing Construction Techniques
Step 1 Start a new drawing using the template Module Template A.
Step 2 Save and name the drawing AutoCAD 2D Workalong 12-3.
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
12 - 7
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
-
8/14/2019 Autocad 2d Module 12 PDF
8/13
12 - 8 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
9/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
12 - 9
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.
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
10/13
12 - 10 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
11/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Construction Techniques
12 - 11
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.
Construction Objects
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
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
12/13
12 - 12 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
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
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.
CompletedDrawing
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy -
8/14/2019 Autocad 2d Module 12 PDF
13/13
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Construction Techniques
12 - 13
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
Fillets The CAD Guys Ltd. Copyright 1993 - 2007 Module 12
http://www.abbyy.com/buyhttp://www.abbyy.com/buy