EX NO: 02 MODELING AND ASSEMBLY OF SCREW JACKDATE :

AIM:

To create drawing components and preparation of assembly models of screw jack.

PREREQUISITE:

Open the Pro/ E wildfire 3 either using the desktop icon or using the program menu.Set the working directory as per your choice.Create a “New” file for part modeling. Set the units to Millimeter Newton second by using the menu Setup-Units-mm Ns.

PROCEDURE:

Part Modeling:

Part no: 1-Body:

The first feature of the body is created by revolving the cross section of the body as shown in fig1.1. The command sequences areas follows.

Revolve Tool- Placement-Define-Solid- Plane (choose front plane)-Okay-Select Default Orientation.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.Sketching is done as per the given shape and dimensioning is done as per the requirements.

An axis is drawn where the section is axisymmetric using the create center lines options in the sketcher.

Exit the sketcher by clicking the “TICK” mark. Enter the angle of revolution when prompted to enter as 360 degrees.

As all the elements have been defined, “OK” is given after accepting the preview shown by pressing the “Preview” button.

A fillet is created for a radius of 8.0 mm as per the given diagram using the round feature. The command sequence is as follows:

Round Tool-Sets -Pick (Pick the edges to be filleted)-Prompt for enter the radius-“Enter the radius”-Press green “Tick mark”-OK(when preview is accepted).

Another fillet is created following the above same procedure as per the dimensions given in the diagram.

Part no: 2-Cup:

The first feature of the Cup is created by revolving the cross section of the Cup is shown in fig.1.2. The command sequences are as follows:

Revolve Tool- Placement-Define-Solid- Plane (choose front plane)-Okay-Select Default Orientation.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

An axis is drawn where the section is axisymmetric using the create center lines options in the sketcher. Exit the sketcher by clicking the “TICK” mark. Enter the angle of revolution when prompted to enter as 360 degrees.

As all the elements have been defined, ”OK” is given after accepting the preview shown by pressing the “Preview” button.

The next feature is cut created using the extrude feature of PRO/E. The command sequences are as follows:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose right plane) - Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

Exit the sketcher by clicking the “TICK” mark. Here the depth of the cut is given as “Thru all” on both the directions. As all the elements have been defined, “OK” is given, after accepting the preview shown by pressing the “Preview” button.

Similar procedure is followed for another cut, but with only change in the plane chosen for the sketch to be placed as different from the previous. Here the “Front” plane is chosen.

Part No: 3-Screw Spindle:

The first feature of the screw spindle is created by revolving the cross section of the screw spindle as shown in fig.1.3. The command sequences are as follows.

Revolve Tool- Placement-Define-Solid- Plane (choose front plane)-Okay-Select Default Orientation.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

An axis is drawn where the section is axisymmetric using the create center lines options in the sketcher.

Exit the sketcher by clicking the “TICK” mark. Enter the angle of revolution when prompted to enter as 360degreees. As all the elements have been defined, “OK” is given after accepting the preview shown by pressing the “Preview” button.

The next feature is a chamfer at two sides of the spindle, which is created using chamfer feature. The command sequences are as follows:

Chamfer Tool-Sets - Edge-45xd-Prompt for Enter chamfer dimensions for d (“Enter the chamfer value of 10mm)-Press green “Tick mark”- OK(when preview is accepted).

A Cut feature is created by selecting the “Front” plane. The command sequences are as follows:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose front plane)- Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

Exit the sketcher by clicking the “TICK” mark. Here the depth of the cut is given as “Thru all” on both the directions. As all the elements have been defined, “OK” is given, after accepting the preview shown by pressing the “Preview” button.

A standard ISO hole of M12 is created using the “Hole” feature. The sequences of commands are:

Hole tool – Placement - Type Coaxial – Select references - select standard hole-ISO-Tapped Hole-M12x1-check add thread surface-add countersink-Variable thread depth(value 30)-variable hole depth(value 35)- Press Green “TICK” mark.

The thread surface on the screw spindle is created using the “Cosmetic” feature. The sequences are as follows:

Insert-Cosmetic-Thread-Thread surf-Pick (Pick the surface where the thread is to created)-Start Surf-Pick(Pick the surface where the thread starts)-Verify the direction of the thread-Okay-Blind-Enter the depth of the thread(value 154)-Enter Diameter(Value 34.5)-Ok.

Part no:4-Nut

The nut is created by revolving the cross section of the body as shown in fig1.4. The command sequences are as follows.

Revolve Tool- Placement-Define-Solid- Plane (choose front plane)-Okay-Select Default Orientation.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

An axis is drawn where the section is axisymmetric using the create center lines options in the sketcher.

Exit the sketcher by clicking the “TICK” mark. Enter the angle of revolution when prompted to enter as 360 degrees. As all the elements have been defines, “OK” is given after accepting the preview shown by pressing the “Preview” button.

The thread surface on the Nut is created using the “Cosmetic” feature. The sequences are as follows:

Insert-Cosmetic-Thread-Thread Surf- Pick (Pick the surface where the thread is to created)-Start Surf-Pick (Pick the surface where the thread starts)-Verify the direction of the thread-Okay- Up to Surface (Pick the surface where the thread ends)-Enter Diameter(Enter value 41.5)-Ok.

Part No: 5-Tommy Bar

The first feature is created by the protrusion feature. The command sequence is as follows:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose front plane)- Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

A circle with a diameter of 20mm is drawn. Exit the sketcher by clicking the “TICK” mark. Enter the extrusion distance when prompted as 213mm.

A similar procedure followed for the next feature but with diameter 12mm and depth 62mm.

The next feature is a chamfer at the joint of the two features. The sequences of commands are:

Chamfer Tool-Sets -Edge-45xd-Prompt for Enter chamfer dimensions for d(“Enter the chamfer value of 4mm)-Press green “Tick mark”-OK(when preview is accepted).

Part No: 6-Washer

The first feature is created using extrude feature. The command sequences are as follows:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose front plane)- Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

The sketch is drawn as per the diagram. Exit the sketcher by clicking the “TICK” mark. Enter the extrusion distance when prompted as 8mm.

The next feature is a chamfer at the edges of the circles. The sequences of commands are:

Chamfer Tool-Sets -Edge-45xd-Prompt for Enter chamfer dimensions for d (“Enter the chamfer value of 5.25mm)-Press green “Tick mark”-OK(when preview is accepted).

A fillet is created for a radius of 1.0mm as per the given diagram using the round feature. The command sequences are as follows:

Feature-Create-Solid-Round-Simple-Done-Constant-Edge chain-Done-Tangent chain-Pick (Pick the edges to be filleted)-Done-Prompt for enter the radius-“Enter the radius”-Press green “Tick mark”-OK (when preview is accepted).

Part No: 7-CSK Screw

The first feature is created using the extrude option in Pro/E. The command sequences are as follows:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose front plane)- Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

A circle for a diameter of 12mm is drawn. Exit the sketcher by clicking the “TICK” mark. Enter the extrusion distance when prompted as 30mm.

The second feature is a revolve feature. The commands are:

Revolve Tool- Placement-Define-Solid- Plane (choose front plane)-Okay-Select Default Orientation

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the given shape and dimensioning is done as per the requirements.

An axis is drawn where the section is axisymmetric using the create centerlines options in the sketcher.

Next feature is a cut which is created by cut feature as following:

Extrude Tool-Placement-Define-Solid-Cut- Plane (chose front plane)- Select Default Orientation - Both sides.

The sketch window opens asking for reference, where the planes with reference to which the dimensions are placed are chosen.

Sketching is done as per the the given shape and dimensioning is done as per the requirements.

Exit the sketcher by clicking the “TICK” mark. Here the depth of the cut is given as “Thru all” on both the directions. As all the elements have been defined,”OK” is given, after accepting the preview shown by pressing the “Preview “button.

The thread surface on the Screw is created using the “Cosmetic” feature. The sequences are as follows:

Insert-Cosmetic-Thread-Thread Surf-Pick (Pick the surface where the thread is to created)-Start Surf-Pick (Pick the surface where the thread starts)-Verify the direction of the thread-Okay-Blind (Enter a value of 21)-Enter Diameter (Enter value 11.73)-Ok.

Assembly:

Assembling of the parts is carried out in a separate file. The Screw Jack Body is first fixed using the plane constraints. The general command sequences are:

Component-Assemble-(Select the component that is to be assembled)-“Select the constraints that is to be created between the parts and chose appropriates surfaces as per the requirements of the constraints).

The part are assembled as per the following order

- Nut(Align, Mate)- Screw Spindle(Align, Mate, Insert)- Cup(Mate, Align)- Washer(Align, Mate)- CSK Screw(Align, Mate)- Tommy Bar(Align)

RESULT:

Thus creation of drawing models and preparation of assembly models of screw jack has been carried out.