Autodesk Inventor Advanced - The CAD Guys Advanced Module 08 PDF.… · Autodesk Inventor Advanced Module 8 Coils and Threads Learning Outcomes When you have completed this module,

Coils and Threads The CAD Guys Ltd. © 1993 - 2015 thecadguys.com Module 8

Inventor® Self-paced eCourse

Autodesk Inventor AdvancedModule 8

Coils and Threads

Learning Outcomes

When you have completed this module, you will be able to:

1 Describe a coil and a thread.2 Apply the COIL command to create coils.3 Apply the COIL and SPLIT commands to create real life threads either cut into or added ontothe part.

Figure 8-1Coil or Spring

Figure 8-2External Threads

Figure 8-3Internal Threads

Coils and Threads

Coils or springs and threads are created using the COIL command.

Coils

Coils or sometimes called springs are constructed by drawing a profile andthen rotating it around at an axis or centerline. See Figure 8-1. You canspecify the shape of the spring by altering the profile, center diameter, pitch,revolution and height. If you specify the pitch and the number of revolutions,Inventor will calculate the height. If you specify the pitch and the height,Inventor will calculate the number of revolutions.

Threads

Threads that are created using theTHREAD command (see Module 19 of theInventor Modules) are not actual threadsconstructed on the solid model. They are simply a graphicalrepresentation of the threads.

The COIL command creates actual real life threads. This is doneby drawing the thread profile (the profile shape of one thread) andthen rotating it around the center line ofthe cylinder. See Figure 8-2. Youcontrol thread construction by specifyingthe pitch, revolution and, height. If youenter the number of revolutions insteadof the height, the COIL command willcalculate the height.

To draw the profile of one thread, it isbest to draw it on a work plane that you create through the center of thecylinder. Internal threads can also be created as shown in Figure 8-3.

Inventor Self-paced eCourse - Autodesk Inventor Advanced - Revised 2015-06-018 - 2


Figure 8-4Threads and Spring Shape and Terminology

Drafting LessonSprings and Threads

Study the Figure 8-4 shown below to learn the termsused when drawing springs and threads. Pitch is animportant term that you must understand and isrequired when using the COIL command.

The threads created by the THREAD command are not actual threads constructedon the solid model. They are simply a graphical representation of the threads. Areal life solid model created from the Inventor part file would not be threaded. Tocreate real life threads on your model, you must use the COIL command to either

add material onto the part in the shape of the thread or remove the material in the shape of thethread.

Inventor Self-paced eCourse - Autodesk Inventor Advanced - Revised 2015-06-01 8 - 3


Inventor Command: COILThe COIL command is used to create a spring or thread by rotating a profile around a center line.

Shortcut: None

Inventor Command: SPLITThe SPLIT command is used to split a solid model into two parts or slice off a portion of a solidmodel.

Shortcut: None



Figure Step 2BThe Completed Spring

Figure Step 2A

Figure Step 4

Creating a Spring

Step 1 Using the NEW command, start a new part using the template:English-Modules Part (In).ipt.

Step 2 Save and name the part: Inventor Advanced Workalong 08-1. (Figure Step 2A and 2B)

Step 3 Draw the Base sketch on the Front view (XZ Plane)and project the Center Point onto it.

Step 4 Draw a centerline of any length starting at X0Y0Z0. (Figure Step 4)



Step 5 Draw a circle for the profile of the spring wire with its center located along the X axis. Dimension the circle diameter and the spring diameter. (Figure Step 5)

Step 6 Enter the COIL command. The Coil dialogue box will automatically select the circle asthe shape since it is the only profile in the current sketch. (Figure Step 6)

Figure Step 5

Figure Step 6



Figure Step 10B

Step 7 Enable the Axis icon and select the centerline. (Figure Step 7)

Step 8 Enable the Solid icon in the Output box.

Step 9 Enable the Rotation Direction icon.

Step 10 In the Coil Size tab, fill it in as shown in the figure. Click OK.(Figure Step 10A and 10B)

Step 11 Save and close the part.

Figure Step 7

Figure Step 10A



Figure Step 2BMultiview Drawing

Figure Step 2ACompleted Solid Model

Creating A Square Thread


Step 2 Save and name the part: Inventor Advanced Workalong 08-2. (Figure Step 2A and 2B)

Step 3 Draw the Base sketch on the Right Side view (YZ Plane) and project the Center Pointonto it.



Figure Step 5

Figure Step 4BFigure Step 4A

Step 4 Draw a circle locating the center at X0Y0Z0 and dimension it. Extrude the circle 5 inchesto create the cylinder. (Figure Step 4A and 4B)

Author's Comments: You will see later in the workalong why I extruded the cylinder 5 inchesinstead of 4 inches.

Step 5 Create a work axis along the centerline of the cylinder. Start a new sketch on the end ofthe cylinder and draw a construction line along the center line. (Figure Step 5)



Figure Step 6

Figure Step 7

Step 6 Create a work plane through the center of the cylinder using the construction line and thework axis you created in Step 5. (Figure Step 6)

Step 7 Start as new sketch on the work plane and then press F7 to slice the graphics.(Figure Step 7)



Figure Step 8

Figure Step 9

Figure Step 10

Step 8 On the sketch, draw four lines to form a rectangle along the top of the cylinder. Thebottom right corner must be on the edge of the cylinder. (Figure Step 8)

Step 9 Add a Fix constraint to thebottom and right lines.(Figure Step 9)

Step 10 Dimension the lines as shown in thefigure. Your square thread is a 0.125 inch squareas shown in the multiview drawing on page 8-6.(Figure Step 10)



Step 11 Enter the COIL command and with the Profile icon enabled in the Shape box select thesquare sketch. Set all other items in the Coil Shape tab as shown in the figure. (Figure Step 11)

Step 12 In the Coil Size tab, set it as shown in the figure. (Figure Step 12)

Figure Step 11

Figure Step 12



Figure Step 13

Step 13 Disable the Visibility of the sketch and the work planethat you created in Steps 5 and 6. (Figure Step 13)

Author's Comments: If you disable the visibility of unconsumedsketches and work features as you finish using them, you will findit easier to continue model construction without obstructions.

Step 14 Create a new work plane on the end of the cylinder andoffset it -0.125 inches. (Figure Step 14)

Step 15 Enter the SPLIT command. In the Split dialogue box, enable the Remove icon in theMethod box, the appropriate Remove Direction icon and select the work plane as the Split Tool. (Figure Step 15A, 15B, and 15C)

Figure Step 14

Figure Step 15A



Figure Step 16

Step 16 Create another work planeoffsetting it 4 inches from the end of thethreaded shaft. (Figure Step 16)

Author's Comments: The next step tocreating a thread is to cut it off so that youget the correct length of thread. That is whycylinder was extruded longer then 4 inches inStep 4.

Figure Step 15B

Figure Step 15C



Figure Step 17

Figure Step 18A

Figure Step 18B

Figure Step 19

Step 17 Using the SPLIT command, remove the otherend of the threaded shaft. (Figure Step 17)

Step 18 Add the ends of the model by creating newsketches and extruding the cylinders. Add the fillets andchamfer. (Figure Step 18A and 18B)

Step 19 Change the color to Chrome Polished and the color property of the end cylinder face toMetal-Steel (Knurled). (Figure Step 19)




Figure Step 4ADimensioned Multiview Drawing

Figure Step 4B

Creating A Screw Thread


Step 2 Save and name the part: Inventor Advanced Workalong 08-3.

Step 3 Draw the Base sketch on the Top view (XY Plane) and project the Center Point onto it.

Step 4 Using the multiview drawing, draw the bolt to the point shown in the figure. Extrude thecylinder 2.50 inches. (Figure Step 4A and 4B)



Figure Step 5

Figure Step 6

Figure Step 7

Step 5 Create a work plane along the center of the model. (Figure Step 5)

Step 6 The figure shows the dimension and shapeof the screw thread that you will be creating in thisworkalong. (Figure Step 6)

Step 7 Create a new sketch on the work plane and then using the commands LOOK AT/VIEWFACE and SLICE GRAPHICS, change the model to appear as shown in the figure.(Figure Step 7)



Figure Step 8

Figure Step 9

Figure Step 10

Step 8 Draw one construction line along the top of the cylinder and another along the end. Thelength of the lines is not important. (Figure Step 8)

Step 9 Draw an inclined line from the intersection of thetwo construction lines and then a horizontal line.(Figure Step 9)

Step 10 Dimension the lines as shown in the figure. See Figure Step 6 for the dimension used inthis figure. (Figure Step 10)



Figure Step 11

Figure Step 12

Figure Step 13

Step 11 Draw a vertical line from the midpoint of the horizontal line at any length. (Figure Step 11)

Step 12 Using the MIRROR command, mirrorthe inclined line to complete the opposite side. (Figure Step 12)

Step 13 Add a line across the top of the V threadprofile to complete the profile. (Figure Step 13)



Step 14 Finish the sketch and enter the COIL command. In the Coil dialogue box, set the itemsin the Coil Shape tab to match the figure. (Figure Step 14)

Step 15 Set the items in the Coil Shape tab to match the figure. (Figure Step 15)

Figure Step 14

Figure Step 15



Step 16 Create a work plane on the end of the bolt and offset it -0.0625 units. (Figure Step 16)

Step 17 Enter the SLICE command and slice off the bolt using the work plane as the cut plane. (Figure Step 17)

Figure Step 16

Figure Step 17



Step 18 Start a new sketch on the work plane and then draw circle the diameter of the bolt.(Figure Step 18)

Step 19 Extrude the circle to add 0.0625 inches onto the end of the bolt. (Figure Step 19)

Figure Step 18

Figure Step 19



Figure Step 21

Step 20 Using the CHAMFER command, chamfer the end of the bolt using 0.0625 as thedistance. (Figure Step 20)

Step 21 Change the color to Copper - Polished.(Figure Step 21)


Figure Step 20

The Key Principles in Module 8

1 Coils or springs are constructed by drawing a profile and then rotating it around at an axis orcenterline.2 Threads that are created using the THREAD command (see Module 19 of the InventorModules) are not actual threads constructed on the solid model. They are simply a graphicalrepresentation of the threads. 3 The COIL command creates actual real life threads. This is done by drawing the thread profile (the profile shape of one thread). It is then rotated around the center line of the cylinder.



Lab Exercise 8-1 Time Allowed: 3 Hrs

Name: Inventor Advanced Lab 08-1 Project: Inventor Advanced Course Units: Inches

Template: See below Color: See below Material: N/A

Figure Step 1AThread Details

Figure Step 1BDimensioned Multiview Drawing

Figure Step 1CCompleted Part -

Home View

Step 1 Create the following parts. Each part must haveits own file. In each part, ensure you do the following:A Project the Center Point onto the Base plane.B Select your own location of X0Y0Z0.C Draw the necessary sketches and extrude or revolvethem to produce the solid model shown. Apply all of thenecessary geometrical and dimensional constraints tomaintain the objects shape and size.D Apply the color and material shown.E Ensure you draw each part in the correct orientationso that they can be assembled together.

Part: BoltPart Name: Inventor Advanced Lab 08-1ATemplate: English-Modules Part (in).iptColor: Steel Polished(Figure Step 1A, 1B, and 1C)



Figure Step 1EDimensioned Multiview Drawing

Figure Step 1DCompleted Part -

Home View

Figure Step 1GDimensioned Multiview Drawing

Figure Step 1FCompleted Part -

Home View

Part: NutPart Name: Inventor Advanced Lab 08-1BTemplate: English-Modules Part (in).iptColor: Steel Polished(Figure Step 1D and 1E)

Author's Comments: Extrude the nut 0.67955 inches. Split 0.07955 off the end.

Part: WasherPart Name: Inventor Advanced Lab 08-1CTemplate: English-Modules Part (in).iptColor: Semi-Polished(Figure Step 1F and 1G)



Figure Step 1HCoil Specifications

Pitch - 0.250 inches6 Revolutions

Figure Step 1JSolid Model - Home View

Part: SpringPart Name: Inventor Advanced Lab 08-1DTemplate: English-Modules Part (in).iptColor: Light Gray(Figure Step 1H and 1J)



Figure Step 1MSolid Model - Orbited ViewFigure Step 1L

Solid Model - Home View

Part: Lock WasherPart Name: Inventor Advanced Lab 08-1ETemplate: English-Modules Part (in).iptColor: Smooth Off-White(Figure Step 1K, 1L, and 1M)

Author's Comments: Create a 0.995 revolution. A full revolution will cause an error.

Figure Step 1KCoil Hint



Figure Step 2BAssembly - Orbited View

Figure Step 2AAssembly - Home View

Assembly Name: Inventor Advanced Lab 08 -1Template: English-Modules Assembly (in).iam(Figure Step 2A and 2B)

Step 2 Assemble the parts that you created in Step 1 to create the assembly shown in figuresbelow. There are two washers. Save the assembly using the name shown above.

Documents

Autodesk Inventor Advanced - The CAD Guys Advanced Module 08 PDF.… · Autodesk Inventor Advanced Module 8 Coils and Threads Learning Outcomes When you have completed this module,