N110IL4

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1EGR 110 – Inventor Lecture #4

Features in Inventor

Inventor includes two types of

geometric features:

• Sketched features (includingextrusions, revolutions, and

sweeps)

• Placed features (including holes,

fillets, chamfers, and shells)

Sketched features required that 1 or

2 sketches be drawn first. Placed

features do not require a sketch.

So far we have only used sketchedfeatures (extrusions) to create solid

models.

The Model browser shows a series

of sequential sketched and placed

features (see example to the right).

Sketched featur e

Sketched featur e

Sketched featur e

Sketched featur e

Placed feature

Placed featur e

Placed featur e

Placed feature

Placed featur e

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Holes

We can create holes using extrusions, but an easier way is to use Hole from the 3D

Model menu.

Example:

Create a simple solid block (extrude a rectangle) and switch to an isometric view.

Select Hole from the 3D Model menu (or press H on the keyboard).

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Holes (continued)

On the Hole menu, select Linear under Placement . Then select three items:

1) Face – Pick the face where you want the hole (pick the approximate location)

2) Reference 1 –

Pick an edge for a distance measurement to the center of the hole3) Reference 2 – Pick another edge for a second distance measurement

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Holes (continued)

Experiment by creating various types of holes, including:

• Through holes

• Holes with a specified depth

• Tapped (threaded) holes

• Countersink holes

• Counterbore holes

• Holes that intersect holes

Also try editing various holes to

change their type, size, location, etc.

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Threads

Note that threads placed inside holes are bit-map images added for appearance only (although the

thread sizes used can be referred to when dimensioning). Threads do not appear on isometrics in

drawing files; however, the threads are properly represented in other views.

Dashed li nes

represents threads

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6

EGR 110 – Inventor Lecture #4

External threads – Internal threads are typically added with

the Hole command. External threads can be applied to the

3D model using the Thread command.

Example: Try creating the following object. Discuss

the sequence of operations used as shown in the browser.

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Fillets, Rounds, and Chamfers

Sharp edges on objects are often rounded off using curved edges or beveled edges.

• Fillet - rounded inside corner

•

Round –

rounded outside corner• Chamfer – beveled edge connecting two surfaces

Notes:

• Both fillets and rounds are created in Inventor using the Fillet command

• Chamfers and fillets can be added to both 2D sketches and to existing solid features.

ChamferRound

Fillet

Original object with sharp corners:

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Adding a Fillet to a 2D Sketch

Pick two edges

and fi ll et (round)wil l appear

Enter radius

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Example with several fillets and chamfers

• Try building this solid in class. Discuss the series of operations that might be used.

• Which fillets and chamfers could be added to 2D sketches?

•

Which should be added later to the 3D model?

Fillet

Chamfer

Round

Chamfer

Fillet

Note: If possible, add chamfers and fillets to a 2D sketch before extrusion. If they are added later to a solid

(as a placed feature), they are often added as late as possible in the sequence of operations so that they do not

interfere with other operations. Note that a machinist creating a part would be likely to add chamfers and

fillets after creating other key features. It is often useful to think of creating parts in Inventor using asequence of operations that might be logically used in building the part in a machine shop.

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EGR 110 – Inventor Lecture #4

Quick Test

The profile shown could be revolved around lines A, B, C, D, E, or F.

Can you determine which line was used for each solid shown below?

Circle the correct letter in each case.

A

B

D

C

E

F

A B C D E F A B C D E F A B C D E F

A B C D E F A B C D E F A B C D E F

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Symmetrical Features

Symmetrical Features can be added in Inventor using:

• Circular Pattern

•

Rectangular Pattern• M ir ror Pattern

The patterns above can be added to the following:

• 2D Sketch

• 3D Model

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17G 110 #4

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Example of Mirror Pattern

Mirror

Line

1. Draw half of object. I nclude mir rorl ine (construction l ine may be useful )

2. Select sketch features tomirr or and the mirr or l ine

3. Extrude to create

soli d model

18EGR 110 I L #4

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Detailed Example: Rectangular Pattern in a 2D Sketch

1) Draw sketch, including one hexagon (use Polygon tool)

2) Select Rectangular pattern, select Geometry , and select the hexagon

19EGR 110 I L #4

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Detailed Example: Rectangular Pattern in a 2D Sketch (continued)

3) Select Di rection 1 and pick a line in the direction the pattern should go (a

horizontal line in this case). An arrow appears showing the direction selected. If

the arrow is in the opposite direction, select the Fl ip button.

4) Enter the number of pattern elements and spacing for Direction 1

Number of elements

Spacing between elements

Di rection arrow and F li p

button

Ar row appears in the

direction selected

for Di rection 1

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21EGR 110 I t L t #4

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Detailed Example: Circular Pattern in a 3D Model

Create a wheel with 6 equally space threaded holes shown below.

1. Create the basic wheel using a revolution

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23EGR 110 I t L t #4

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Detailed Example: Circular Pattern in a 3D Model (continued)

3. Select Hole from the 3D Model menu. Use the following options:

• Placement: From Sketch

• Pick the center point where the hole is to be placed

• Termination: Through All

• Diameter: 0.75 in (or your choice)

• Select Threaded Hole and then select OK

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25EGR 110 Inventor Lecture #4

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f15

f25

f5

Front Right

f15

f25

f5

Front

Centerlines and Linear Diametric Dimensions

For revolved features it is common to use l inear diametr ic dimensions instead of

radial dimensions . An example of the difference is shown below.

Example using

radial dimensions

Example using

l inear diametr ic dimensions

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Revolved Features with Linear Diametric Dimensions (continued)

2. Add dimensions by selecting:

a) The centerline (not its endpoint)

b) A line on the profile3. Finish the sketch and revolve the sketch


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Revolved Features with Diametric Dimensions (continued)

4. Create a metric drawing file using the part (ANSI(mm).idw with A-size, portrait).

• Add front, top, and isometric views. Change the scale if necessary.

• Retrieve dimensions for the front view – note that they are linear diametric dimensions

• Change the number of digits to whole mm using:

Manage – Styles Editor – Dimension – Defaul t: mm (ANSI ) – Precision - 0

L inear diametr ic dimensions

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