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M E T - 2 0 5 A D V A N C E D C A D

C O T T E R P I N U S I N G F A M I L Y T A B L E C R E O P A R A M E T R I C

REFERENCE: DR. HERLI SURJANHATA & DR. SAM LIEBER

COTTER PIN - EXTENDED PRONG SQUARE CUT TYPE

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The following procedure outlines the creation of cotter pin containing family table information – see above. The modeling of cotter pin is done using Sweep protrusion.

CREATING A SWEEP PROTRUSION FOR COTTER PIN

Create a new part called cotter_pin.prt in the working directory. The units are in inches (default units of Creo Parametric).

From Model ribbon menu, select Sweep.

Select to sketch the trajectory for the sweep.

Create the following trajectory.

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Sketching plane – FRONT datum plane

Orientation reference – RIGHT datum plane (default)

Click .

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Click .

Click to continue with the sweep.

Pick the newly created curve as trajectory.

Click and create a section. Sweep the section along the trajectory

Click to display in sketch view.

Note that this is a closed section.

The resulted sweep protrusion is shown below:

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Click .

Click .

Setup parameter NOM_SIZE by selecting

From Tools ribbon menu, select Parameters.

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Click .

Enter Parameter name: NOM_SIZE

Type of parameter: String

Enter value for parameter: DIA

MODIFYING DIMENSION SYMBOLS

Right click the swept protrusion, then select Edit.

Double click the trajectory of the sweep.

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Note that the dimensions may be displayed in two decimal places, e.g. 0.125 is displayed as 0.13. Modify the displayed dimensions as shown below.

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Select all dimensions, right-click the graphics area and select Properties.

Change the Decimal Places to 4 as shown.

Click

.

Repeat the same procedure for the sweep cross section – see below.

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Expand Sweep 1 and right-click Section 1 and select Edit.

Change the Decimal Places to 4.

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Click .

Pick .0600, right click mouse button, then select Properties.

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Under Properties tab in Dimension Properties dialog box.

Change the Name to HEAD_DIA.

Click .

Repeat the procedure for the following:

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Pick Enter symbol text

.0320 WIRE_WIDTH

.0100 PRONG

.1250 LENGTH

To change the

diameter .0320 to symbol text, expand the swept protrusion, then right click Section 1 -> Edit.

Select Properties.

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To verify the changes, from Model Intent pull down menu, select Switch Symbols.

The results are shown as in the figure below.

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ADDING RELATIONS

From Tools ribbon menu, select Relations.

Double click the cotter pin in the graphics area to show the dimensions.

Select All.

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Enter the following relations.

Test relations by modifying HEAD_DIA from 0.06 to 0.09, and hit Enter ( Regenerate

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).

Change back the HEAD_DIA to 0.06, and Regenerate ,

Hide the trajectory datum curve by selecting Sketch 1 and right-click and select Hide.

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CREATING A FAMILY TABLE

From the Tools ribbon menu, select Family Table which will open the Family Table dialog box.

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Select the Add icon in order to add items to the family table.

Under Add Item, Click Parameter.

The Select Parameter dialog box opens.

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Pick parameter NOM_SIZE, then click the Insert Selected icon

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Click the Close icon .

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Under Add Item, Click

Dimension.

Pick the part in the graphics area. The dimensions of the part will be displayed.

Select All

Note:

If the trajectory dimensions do not display, select the curve Sketch 1 from the Model Tree.

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Now select the dimension to be controlled in the family table.

Pick the dimensions .032,

.06, .010 and .125 as Add Item.

OK.

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Note that COTTER_PIN is the name of the generic part.

Pick the Insert icon in the Family Table dialog.

Change the name COTTER_PIN_INSTANCE to COTTER_PIN_01

Type in 0.031 for DIA

The “*” symbol indicates that the value from the generic is used.

Pick the Insert icon in the Family Table dialog.

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Change the name COTTER_PIN_INSTANCE to COTTER_PIN_02

Type in 0.047 for DIA

Type in 0.048 for WIRE_WIDTH

Type in 0.09 for HEAD_DIA

Type in 0.02 for PRONG

The “*” symbol indicates that the value from the generic is used.

Pick the Insert icon in the Family Table dialog.

Pick icon to preview the new instance.

Click Close button.

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Repeat the procedure for more instances as shown below:

Click OK button.

Click to save cotter pin.

To verify the new instances, click - the Open file icon,

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Click

Select for example COTTER_PIN_04, then click Open button. The cotter pin instance with 0.078 inch nominal diameter is open and ready to be used.

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Switch back to cotter pin part.

Click and select COTTER_PIN.PRT

Save the cotter pin with Family Table.

C R E A T E A D E T A I L E D D R A W I N G W I T H A F A M I L Y T A B L E

IMPORTANT:

Be sure to copy the drawing template file you intend to use in your working

directory. In this case, copy e.g. njit_b_size.frm to your working directory.

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Pick the Create new object icon

, and select Drawing from the New dialog box.

Enter the name COTTER_PIN

Uncheck Use default template box.

Click on OK.

From the New Drawing dialog box, select Empty with format. Click Browse button.

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Click on

where your store the file and drawing template.

Select the size B drawing template format you previously customized e.g. njit_b_size.frm

Note that you may save your template under different name.

Open.

Select OK from the New Drawing dialog box.

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Select The generic.

Open.

Enter the PROMPTED Information

PART_NUMBER: NJIT-MET-001

DWG_REV: 0

MATL_FINISH: Just Press ENTER

DWG_TITLE_LINE1: COTTER PIN

DRAWN_BY: Enter Your Initials

DRAWN_DATE: Enter the Date (e.g. 09/29/14)

CHECKED_BY: Just Press Enter

CHECKED_DATE: Just Press Enter

HEAT_TREAT: Just Press Enter

MATL: 18-8 SS

When you first create a drawing with the format you will need to adjust the scale as well as the tolerance display.

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To do so go to File >Prepare>Drawing Properties

The Drawing Properties Window will pop up.

Click on Change next to the Detail Options.The Options Window will then pop up.

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In the Option box enter tol_display and press Enter. Then select yes in the value, and then press the Add/Change.

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In the Option box now enter view_scale_format and press Enter. Then select ratio_colon in the value, and then press the Add/Change.

Right above view_scale_format left click on view_scale_denominator. Enter 4 in the value and then press Add/Change.

Click OK to exit the Options. Click Close on the Drawing Properties window.

When you return to your drawing you should see the Scale section of your title block is in a ratio format.

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The border and title block of cotter pin drawing is shown below.

To create a general view of the cotter pin, select

Click .

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When prompted for the CENTER POINT for the drawing view, pick the location near middle left of the drawing. The Drawing View dialog box appears.

Enter the view name of front_view.

Select FRONT from the Model view names list.

Click Apply.

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Under Categories, select View Display.

From Display Style drop down list, select Hidden.

Click OK.

Create a projected right side view of the cotter pin.

Click

Or do the following:

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Click the existing view, in this case – Front view, right-click it, then select Insert Projection View.

Pick a location to the right of the FRONT view.

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Right-click the view and select Properties.

Enter the View name of right_view.

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Under Categories, select View Display.

From Display Style drop down list, select Hidden.

Click .

Turn-off ALL datum and click to repaint.

The resulted drawing is shown below.

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Click to create the 3-D view of the cotter pin. Pick the location at the upper right corner of the drawing.

Enter View name of isometric_view.

Under Default orientation, select Isometric.

Apply.

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Under Categories, select Scale.

Pick the radio button Custom Scale and change the value to 20.

Click Apply.

Select View Display.

Change the Display style to Shading.

Click Apply.

Click .

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Right-click the graphics area and select Lock View Movement to unlock view movement.

The view can now be moved to the desired position. Be sure to turn off ALL datum features

and click .Create the following drawing as shown below.

Change the scale of the drawing from 15 to 20.

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Click SCALE:15.000 on the lower left corner of graphics area, then double click the numerical number of scale.

Enter the new value for scale 20.

Press Enter.

Show the dimensions of the cotter pin.

Select tab.

Select .

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Pick the FRONT view – see figure below.

The dimensions of front view are now displayed.

Click to show all dimensions.

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Click .

Click to reorganize the dimensions.

Select the dimensions shown below and holding ctrl, press OK.

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Click Apply and Close.

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Move 0.032, 0.032 and 0.016 dimensions to the right-side view.

On your own, rearrange other dimensions using available tools.

The cotter pin dimensions will be as shown below.

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CHANGE DIMENSIONS DISPLAY TO PARAMETERS

Pick on .125 dimension and right-click and select Properties.

Notice that symbolic Name of this dimension is LENGTH.

Change to Display tab.

In order to display the symbolic name change @D to @S.

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OK.

The resulted operation is shown in the figure below.

Repeat the same technique for the rest of parameters – see figure below.

To reposition Dimensions click on the Dimension with the left button and drag to a location.

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To Flip text Right Click on the dimension and select Flip Text.

INSERT A FAMILY TABLE INTO THE DRAWING

Two dimensional repeat regions are used to display the information contained in a model's family table such as the instance names, parameters, and dimensions. They can be used to create tabulated drawings of parts and assemblies that belong to a family of parts or assemblies.

Create a table with 2 rows and 2 columns, as seen in figure below. (Do not enter the letters A, B, C, and D. These are used to reference the cells in the table.). For this example an ascending and leftward table is used.

Add a 2D repeat region to the table using the commands: Repeat Region -> Add ->

Two-D. When prompted to "Locate corners of the outer boundary of the two-dimensional region", one of the following four cases will apply. The following cells should be selected, in order, depending on how the table will expand:

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If table is descending and rightward, select cells A and D If table is descending and leftward, select cells B and C If table is ascending and leftward, select cells D and A If table is ascending and rightward, select cells C and B

When this is done, the outer border of the table will be highlighted in red.

Notice that if a line is drawn through the cells in one of the orders listed above, this line will show how the table will expand. A line drawn through A and D will extend down and to the right, the same way the table will expand with information from the family table. This will be important when entering symbolic information later.

When prompted to "Select a cell to set the upper border of the row & column subregions", one of the following cells should be selected, depending on how the table expands:

If table is descending and rightward, select cell D If table is descending and leftward, select cell C If table is ascending and leftward, select cell A If table is ascending and rightward, select cell B

Create a table with 2 rows and 2 columns as shown below.

Select tab.

Click tool.

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Create a 2x2 Table.

Pick a location at the upper left corner on the drawing.

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Add a 2D repeat region to the table.

Click .

Select Add.

Pick here for table location.

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Select Two-D.

When prompted to

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Pick upper left corner cell and lower right corner cell.

When prompted to

Pick lower right corner cell, and the following message appears.

Select Done.

The following parameters need to be placed in 3 of the cells:

&FAM.INST.NAME &FAM.INST.PARAM.VALUE &FAM.INST.PARAM.NAME

Double click the lower left corner cell.

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Select fam…

Pick inst…

Pick name.

Repeat the same procedure and place two more parameters as shown below.

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From Table tab, select

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Note: The drawing setup file option 2d_region_columns_fit_text controls whether or not each column will automatically auto size to accommodate the longest piece of text in the column. Set the option to yes to enable the functionality.

File -> Prepare -> Drawing Properties.

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Under Option: box, enter 2d_region_columns_fit_text. Change the value of the box to yes.

Click Change of Drawing Options.

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Click on .

Click OK.

Click on to execute the auto size function.

Select to change the fonts of the drawing if desired e.g. Blue Print MT. The final drawing is shown below.

Change the width of the first column.

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Click the upper left corner cell (first column).

Pick Select Column.

Right-click the graphics area and select Width.

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Enter the value of 1.875 inches for Width in drawing units. Click Preview.

Click .

As a final step make sure you are in the Annotate tab and go to the Revision History Table (located in the upper right corner).

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Double click in each cell and enter the information below. In the BY and DATE cells enter your initials and date respectively.

The print is shown below.

To print the drawing, select File -> .

Save the drawing.

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A S S I G N M E N T

Be sure to include the following in your report,

1. Use the homework Template to show CAD images of your part.

2. Take Snapshot of Family Table produced in CAD model environment.

3. Detailed drawing of cotter pin with Family Table information – see figure above.