Project 1- Modeling a Plate

7/29/2019 Project 1- Modeling a Plate

1/17

Project 1: Modeling a Plate

In this project you will create a plate by first using basic curves to create its profile, then extruding that

profile.

Afterward, you will create a differently shaped solid by adding some curves, then editing the extruded

profile.

PrerequisitesTo model this part you must be able to:

Create basic curves Trim curves Create extrusions

Edit a defining string

The Dimensions of the PartThese are the overall dimensions of this part (in millimeters).

The Methods Used in This Project to Model the PartIn this project you will:


2/17

? Use circles to define three corners of the profile.

? Use lines tangent to the circles to define the sides of the profile.

? Create the angled line on the upper left side of the profile.

? Construct the upper right corner of the profile.

? Trim appropriate curves.

? Create a circle (that will define a hole in the extruded solid).

? Extru de the profile.

Create additional curves.


3/17

? Edit the extruded profile.

Task 1. Begin With a Standard Metric Part File

Open the standard metric part file, standard_mm, from the project sub-directory

If you want, you can save this part file in your own directory using a name such as profile_1.The standard part file uses the following layer standards:

? Solid geometry on layers 1 through 20.

? Sketch geometry on layers 21 to 40

? Curve geometry on layers 41 to 60

? Reference geometry on layers 61 to 80

? Sheet bodies on layers 81 to 100

? Drafting objects on layers 101 to 120Start the Modeling application.

Since you will create these curves on the XC-YC plane of the WCS, you can change the orientation so thatyou are looking "down" upon that plane.

Replace the view with a TOP view.

You will want to develop this profile on a layer reserved for curves.

Change the work layer to layer41.

Since you will be working with this view throughout this project, the instructions will refer to the "top" and

"bottom" of the profile (top being in the +YC direction).

Task 2. Planning the Development of This ProfileThe person who dimensioned this part gave some critical dimensions (such as the distances between the arccenters of the corners).


4/17

You've looked this over and have decided that it will be possible to build this profile from the dimensions

that are given but you will need to be clever in creating some of the curves.You plan to begin by creating the three circles that can be used to define these corners of the plate.

Eventually you'll trim these circles into arcs to create the corners.

Task 3. Define the Lower Left Corner of the ProfileA logical place to begin is with the lower left corner. You can create a circle at the origin of the WCS.

Create a circle at the origin of the WCS.

? Choose the Basic Curves icon or choose InsertCurveBasic Curve.

? Choose the Circle icon.

? In the XC field of the dialog bar, key in 0.

? Tab to the YC field, then key in 0.

? Tab to the Radius field, then key in 9.

? Check all the values in the dialog bar.- Change any wrong values.

? Press Enter/Return.

Task 4. Define the Upper Left Corner of the ProfileYou can create another circle that you will trim later to define the upper left corner. This circle has the

same radius as the first.


5/17

Create a second circle directly above the first.

? Choose the Circle icon again to begin a new circle.

? In the XC field, key in 0.

? In the YC field, key in 32.

? In the Radius field, key in 9.


Task 5. Define the Right Corner of the Profile

You can use another circle to define the lower right corner of the prefile.

Create another circle directly to the right of the lower circle on the left.

? Choose the Circle icon again.

? In the XC field, key in 162.

? In the YC field, key in 0.



? Fit the view.

Task 6. Create the Lower Line of the Profile

Now that you have defined three corners of this profile, you can begin creating the lines that will define its

edges.

Create a line that is tangent to the bottoms of the two lower circles

? Choose the Line icon.

? Optional: Turn String Mode off.

? If you need to, set the Point Method option to Inferred Point.? Select the lower circle on the right, avoiding control points.

? Select the circle on the left, again avoiding control points. (The line tangent to both circlesappears).

Task 7. Create the Left Line of the Profile

You can do the same thing on the left side of the profile.


6/17

Create a line tangent to the left sides of the two circles on the left.


? Select the lower circle on the left.

? Select the circle right above it. (The line tangent to both circles appears.

Task 8. Planning the Next Task

Now you are ready to begin constructing the elements that will define the upper edges of this profile.

From the dimensions that you were given, you don't know the exact location of the arc center of the upper

right corner. However, you do know the distance between the upper and lower edges of the profile.

Also, you know the angle of the left angled line.

So a good place to begin would be to define the left angled line. Then you can use it (along with a

construction line) to create the top right outside arc of the profile.

Task 9. Create an Angled LineYou know that you can use an existing line to restrict the angle of a new line

In this case the angled line must be 60 degrees away from the vertical (or 30 degrees away from thehorizontal).

Create a line tangent to the top left circle.

- Make sure you can only create a line that is at a 30 degree angle to a horizontal line.- Use a screen position to establish the upper end of this angled line.


? Choose the top left circle (avoiding control points) to establish a tangency.

? Select the horizontal line (avoiding any control points).

? in the Angle field, key in 30, then Tab to the next field to establish this value.

? Indicate a screen position for the endpoint of this angled line at a location near its probable endpoint.


7/17

Task 10. Planning the Definition of the Top Right Corner of the ProfileIf you had a horizontal line at the correct location, you could use it and the angled line to create an arc that

is tangent to these two lines-in other words, a fillet.

So your next task will be to create the construction line that you will need.

Task 11. Create a Construction Line

Offset the horizontal line to create the construction line.Choose the Line icon.Select the bottom line (and place the cursor so that it will define the direction of the

offset).In the Distance field, key in 178.Press Enter/ReturnFit the view.


8/17

Task 12. Create an Arc that Will Define the Top Right Corner of the Profile

Now that you have the curves you need, you can create the fillet. This fillet will need to have a radius that

can be used to eventually define this top right corner of the profile.

In the graphics window, be sure you can see where the intersection between the construction line and the

angled line will be.

Create a fillet between the angled line and the horizontal line.- Be sure you trim both lines as you create

? Choose the Fillet icon.? For the method, choose the 2 Curve Fillet icon.


? Leave both tr im options on.

? Picking in a counter clockwise direction, select the topmost horizontal line.

? Select the angled line.

? Indicate the quadrant for the arc of the fillet (to the right of the expected placement of the fillet.

Task 13. Delete the Construction Line

Delete the construction curve.

? Choose or choose EditDelete.? Select the upper horizontal line.

? OKthe Class Selection dialog.

Task 14. Preparing to Lengthen the FilletIn order to create the angled line on the right side of the profile, you will need to lengthen the fillet so you

will be able to create a line tangent to the circle and arc.


9/17

You will want to set up the dialog so the trim procedure will be correctDisplay the Basic Curves dialog, then display the Trim Curve dialog.

When you trim curves in this project, you will want to:

- Automatically move to the next selection step.

- Have the system trim bounding objects.

- NOT reuse bounding objects.

- NOT create associative curves.

? Be sure the Automatic Progression option is on.

? Turn the Trim Bounding Objects option on.

? Turn the Reuse Bounding Objects option off.

? Be sure Associate Output is off.

Task 15. Lengthen the Fillet

Trim the fillet by making its arc longer.

HINT: Trim to an indicated point.

? Get in closer to these curves at the top corner of the profile.

? Be sure the First Bounding Object selection step icon is highlighted.


10/17

? Set the Filter option to Point.

? Leave the Point Method set to Infer.

? For the first bounding object, indicate a point below the fillet about where you think the arc shouldend.

? There's no second bounding object, so choose the String to Trim selection step icon (or just useMB2).

? For the string to trim, select the right end of the fillet.

Task 16. Define the Angled Right Side of the ProfileNow that you have the two curves that define the top and bottom corners on the right side of the part, youcan create the angled line that will finish the basic geometry of this profile.

Create a line tangent to the lower circle and the upper arc.

HINT: Check the status line to be sure you've selected the correct object.

? Choose the Basic Curves icon.


? Select the lower circle on the right.

? Select the larger circle right above it. (The line tangent to both circles appears.)

? Check the status line to be sure you have selected an arc and not an arc endpoint or midpoint!

Task 17. Clean Up the Top Right Corner of the ProfileYou are ready to trim the fillet you used to define the top right corner of this profile.


11/17

Trim the arc back to the angled line.

Make sure you will be able to trim any curve.

? Choose the Trim icon.

? Set the filter back to Any.

? For the first bounding object, select the angled line on the right.

? Since there is no second bounding object, choose the String to Trim selection step icon (or just

use MB2).? For the string to trim, select the lower end of the arc.

Task 18. Clean Up the Other Corners of the ProfileYou can finish the lower part of the profile by trimming the three circles you used to define the corners of

this profile.

Trim the circle in the upper left corner.

Use the same method to trim the remaining circles.

Task 19. Create the Hole in the Top Right Corner of the Profile

You also need a hole in the part in this area.

Use the arc center of the top right arc to create a circle.

- Center it at the arc center of the rounded end of this profile

? .Choose the Basic Curves icon.

? Choose the Circle icon.

? Select the arc center of the top right arc.

? Optional: Indicate a temporary diameter.

? In the Diameter field, key in 25, then press Enter/Return.

? Cancel the dialog.


12/17

Task 20. Prepare to Extrude the ProfileYou will want the solid to be on a layer reserved for solids.

In this project, layers 1 through 20 are reserved for solids.

Change the work layer to layer1.

You will also want to view the extrusion in a trimetric view.

Replace the current view with a TFR-TRI view.

Task 21. Extrude the Profile

You are ready to create the solid.

Extrude the profile (including the hole) 10 mm upward from the curves.

? Choose the Extruded Body icon from the Form Feature toolbar or choose InsertForm FeatureExtrude.

? Select all the curves in the profile, including the hole.

? When all the curves in this profile are highlighted, OKthe Extruded Body dialog.

? Choose the Direction, Distance option.

? If the direction arrow points upward from the profile, choose OKto accept the default direction.Otherwise reverse the default direction.

? For the Start Distance, use zero.

? For the End Distance, use 10.

? Use zero for the offset and taper values.

? OKthe dialog.

Task 22. Preparing to Change the Shape of the Extrusion

An engineering change requires that you change the shape of this plate.

To accomplish this change you can create the new curves that you will need, then edit the profile of theextrusion.


13/17

You decide that it would be better if the new curves were on their own layer.

Change the work layer to layer42. Make layer1 invisible (and be sure layer 41 remains selectable).

Change to a TOP view.

Task 23. Add a Curve to the Existing CurvesThese are the measurements of the new shape.

You decide that you can create this new shape by adding a line between the midpoints of the two angled

lines then adding appropriate fillets.

Create the a new line between the midpoints of the two angled lines.

? Choose the Basic Curves icon or choose InsertBasic Curves.

? Be sure the Line icon is highlighted.

? Set the Point option to Infer orControl Point.

? Create a new line between the midpoints of the two angled lines.

Task 24. Planning the Method for Rounding the Corners of the New ShapeYou will need to round the upper corners of this new shape before you can edit the extrusion.


14/17

You plan to use fillets to do this. But you must keep the original angled lines because they are currently

being used in the extrusion.

One way to do this is to create new lines between the ends of the new fillets and the existing fillets on the

bottom of the profile.This means you will have to be careful to nottrim the original angled lines as you create the fillets.

Task 25. Rounding One Corner of the New ShapeYou can create the left fillet first. You must maintain the full length of the original angled line.

Create a fillet at the left end of the new line.

- Trim the top part of the angled line as you do this.

? Choose the Fillet icon on the Basic Curves dialog.

? Choose the 2 Curve Fillet icon.

? Key in a Radius value of25.

? Turn the Trim First Curve option on.

? Turn the Trim Second Curve option off.

? Select the newly created angled line.

? Select the leftmost angled line.

? Indicate the proper quadrant.


15/17

Task 26. Rounding the Other CornerThe radius of the other corner must be smaller.

Create a fillet at the right end of the new line.- Use the correct radius for this corner.

- Be sure to trim the correct curves as you create this fillet.

? In the Radius field, key in 10.? Turn the Trim First Curve option off.

? Turn the Trim Second Curve option on.

? elect the long angled line.

? Select the new angled line.

? Indicate the proper quadrant.

? Cancel the dialog.

Task 27. Preparing to Create New Curves Between FilletsBecause you plan to delete the original angled lines from the profile, you must create two new curves

between the ends of the two new fillets and the existing fillets.


16/17

Blankthe two angled lines.

? Choose EditBlankBlank.

? Select each angled line.

? OKthe Class Selection dialog.

Task 28. Creating New Curves Between FilletsYou are ready to join the ends of the two new fillets to the existing fillets.

Create two new lines connecting the new fillets you just created with the fillets on the bottom of the profile.

? Display the Basic Curves dialog.


? Optional: Be sure that String Mode is off.

? Select the lower end of the upper fillet on the left.

? Select the upper end of the lower fillet on the bottom left.

? Do the same between the fillets on the right.

Task 29. Preparing to Replace the Curves in the Profile of the ExtrusionUnblankthe blanked angled lines.


17/17

Task 30. Edit the ExtrusionYou are ready to choose the curves that will be used to define the extrusion.

Use the Edit String dialog to edit the profile so that the new shape will replace the current extruded shape.

- First, remove the four curves that define the upper part of the original extrusion.

- Then add the curves that will define the new shape.

? Choose the Edit Feature Parameters icon or choose EditFeatureParameters.

? On the Edit Parameters dialog, select the extrusion feature, EXTRUDED(0), from the list box.

? OKthe dialog.

? On the Edit Parameters dialog, choose Edit Defining String.

? Use Shift-Select to deselectthese curves from the profile: the two original angled lines, the circle(hole), and the fillet around the hole.

? Select the three new lines and the two new fillets.

? OKthe Edit String dialog.

? OKboth Edit Parameters dialogs.

Task 31. Displaying the Solid

When you are ready, change back to the trimetric view.Make layer1 selectable. Make layers 41 and 42 invisible.

This completes the project.

Documents

Project 1- Modeling a Plate