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EN1740 Computer Aided Visualizationand Design

Spring 20103/16/2010

Brian C. P. Burke

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Tonight:

Family Tables

Simplified Reps

Last Time:

Project questions

Critical To Function Dimensioning(CTFD)

Title block tolerances

Industry standard tolerances

General notes

Intro to Top-Down Design

Fundamentals

Skeletons

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Family Tables

In many cases mechanical components have very similar constructions

Family Tables can create multiple instances of components sharing commonfeatures

http://www.curiousinventor.com/images/guides/metal_working/screws/machine_screws3.jpg http://www.projectholds.com/images/SS38ST.jpg

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EXERCISE - Family Tables

From the SupportingMaterials page downloadstuff for tonight

File > Open > shcs.prt

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EXERCISE - Family Tables

Tools > Family Table

This will launch theFamily Table definitiondialog

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EXERCISE - Family Tables

We will build a table in this dialog that defines the family of components

The columns of the table are comprised of the parameters that definethe components

Each row will be a separate instance of the family, defining a specificset of parameter values

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EXERCISE - Family Tables

Select the Add/Delete the TableColumns button on the FamilyTable dialog box

Another dialog will launch to selectthe dimensions we are concernedwith

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EXERCISE - Family Tables

Select the followingdimensions:

Head height (.250)

Head diameter (.375)

Hex width (.188)

Hex depth (.120)

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EXERCISE - Family Tables

Select the followingdimensions:

Thread major dia. (.250)

Shaft length (1.500)

Thread length (1.000)

Thread minor dia. (.191)

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EXERCISE - Family Tables

Click on OK on the selection dialog

Take a look at the Family Table dialog to see thedimensions that available

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EXERCISE - Family Tables

Click on the Insert a new instant at the selected row button

Note that a new row is created with blank values

Name the new instance P250-20_X_1P500

Be careful that the name is accepted

The instance naming standard is very restrictive

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EXERCISE - Family Tables

Click on the Insert a new instant at the selected row button

Note that a new row is created with blank values

Name the new instance P250-20_X_1P500

Be careful that the name is accepted

The instance naming standard is very restrictive

Copy all the values from the previous row into the new row

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EXERCISE - Family Tables

In Family Table dialog,Tools > Verify

In Family Tree dialog,Click VERIFY button

This step verifies that

the model weve justcreated will regenerate

correctly

Verification Status shouldappear as Success

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EXERCISE - Family Tables

Why did we just create the same thing again?

Generic or Base Instance Everythingelse is created from here, name indicateswhat the family is and indicates where it

can be modified.

Instance The name given to this instance indicatesexactly what the instance is.

NOTE: This isnt necessary, but is a good practice the adds to the clarity of the family

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EXERCISE - Family Tables

These column headings are not particularly helpful

Already there are too many columns to keep track of

Lets add some clarity to make this more efficient going forward..

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EXERCISE - Family Tables

Change the name of the key feature dimensions

Edit the first solidfeature (Extrude1)

Info > SwitchDimensions

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EXERCISE - Family Tables

Change the name of the key feature dimensions

RMB on head height

Properties

Click Dimension Texttab

Enter head_height inthe Name box

Click OK

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EXERCISE - Family Tables

Notice the name of the dimension

Repeat this process for

head_diameter

hex_width

hex_depth thread_major_dia

shaft_length

thread_length

thread_minor_dia

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EXERCISE - Family Tables

Go back and examine the Family Tablecolumn headers (much better)

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EXERCISE - Family Tables

Create a new instance that has a 1.000 shaft_length and .750 thread_length

Verify the instance

Save the model

Open the new instance

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EXERCISE - Family Tables

Create a Family Table to show a spring in free, installed and compressed lengths

Open relief_valve.asm

Notice: the pistoninterferes with the sealbecause the spring

stack is shown at freelength

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EXERCISE - Family Tables

Open belleville.prt

Rename the followingdimensions as we didpreviously

ID

OD

THICKNESS

HEIGHT

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EXERCISE - Family Tables

Create a family table

Select all the

dimensions mentioned on

the last slide as columns

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EXERCISE - Family Tables

Go back to the relief_valve.asm

assembly

Measure the interference

between the piston and the seal

Analysis > Measure >

Distance

Select plane on piston

Select plane on seal

Note the total interference is

.059in

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EXERCISE - Family Tables

From the measurement, we need

to lower the height of the Bellevilles

from .034 to .0242

Create a new instance

BLLV_INSTLL

Copy all dimensions, except

for the height

Change height to .0242

Verify instance and save part

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EXERCISE - Family Tables

Return to the assembly

Create a Family Table (Tools >

Family Table)

Begin by adding columns

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EXERCISE - Family Tables

This time in the selection

dialog box, check the

Component radio button

Select each Belleville

washer

When prompted

select Single

Continue until all 6

Bellevilles are selected

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EXERCISE - Family Tables

Create a new instance with the add row button

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EXERCISE - Family Tables

Select cell for the first Belleville instance

Tools > Replace Using > Related model

Select the Belleville instance with the reduced height

Repeat these steps for all 6 Bellevilles

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EXERCISE - Family Tables

Once all the Bellevilles are swapped out, Verify the model

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EXERCISE - Family Tables

After verifying the model, select Preview and make sure the interference is gone

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EXERCISE - Family Tables

Save the generic and then open the instance

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EXERCISE - Family Tables

Done

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Simplified Representations

http://www.designnews.com/photo/48/48453-CA6432043_A.jpg

Simplified Reps allow for the

management of large

assemblies

Components can either beincluded, excluded or reduced

in the amount of information

they contain

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Simplified Representations

Types of Simplified Representations

Master Rep Fully featured and detailed parts

Geometry Rep Will show modifications to assembly features, but

not part features

Graphics Rep No changes reflected, basically just a place holder

Symbolic Rep Just a point

More SystemResources

Less SystemResources Representations can be applied to the whole

model or to individual components

See help file for more details on each Rep type

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EXERCISE - Simplified Representations

Create a Simplified Rep with all types of representations

Click View Manager

Click Simp Rep tab

Click New button

Name the new rep,

bell_rep

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EXERCISE - Simplified Representations

Once the new name

is entered the edit

dialog will launch

Current rep status of

the components in the

assembly is listed in

the left

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EXERCISE - Simplified Representations

From the Exclude

tab components can

be eliminated from

the Rep

The DEF button willReset the definition of

any components in

the representation

Select the desired

definition here and

then select

component

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EXERCISE - Simplified Representations

Create a rep that:

Excludes the Bellevilles

Set piston to Geometry

Set housings Graphics

Set the seal to Symbolic

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EXERCISE - Simplified Representations

Done