Introduction - Teacher Notes Fig 1. The project focuses on the design for a Pencil holder, but could be adapted to any simple assembly. Pro/DESKTOP enables pupils (and teachers) to communicate and model complex 3D concepts in a fairly straightforward but highly accurate and attractive way. This project covers the skills of modelling and assembling two objects. The Pro/DESKTOP part of the project may preceed traditional design elevation sketches. It is hoped that following the Pro/DESKTOP stage pupils may go on to manufacture the design. Context The context for this project is to design a small, two piece pencil, ruler and eraser holder with opportunity to apply some design control. Simple shapes can be mass manufactured or made as oneoff designs. Problem Design a desktop device that will hold a number of pens, a 150mm ruler and a pencil eraser. The design should include a vertical back panel to prevent accidental knocking of the pencils and to provide opportunity for aesthetic designing opportunities. Constraints It assumes limitations as to sizes of materials allowing creativity but provides a common form of assembly for the pupils in the group. Available are: a fretsaw (scrollsaw) hand tools drilling machine bits of 12 and 40mm. Diameter the model will be made from a block of softwood 200mm long 80mm deep which is 40mm thick. a sheet of 6mm. M.D.F. (or Plywood) up to 200mm square. To draw a 2D sketch of a block to hold things
Fig 2. 1. Open Pro/DESKTOP 2. From the File menu select New 3. Choose Design 4. Select OK 5. Maximise both screens 6. Choose the Create Rectangle tool. 7. Move the pencil cursor to the workplane (Green rectangle with arrow on). 8. Move to just inside the top left corner of the green rectangle,. 9. Press and hold and drag the cursor down to the right to create a rectangle. Release the mouse button to finish creating the rectangle. To constrain the rectangle to a set size Fig 3. The PARAMETRIC of Pro/DESKTOP uses numerical values to constrain the size of object such as lines or circles or separations. 1. Choose the Constrain Separation tool 2. Move over a side of the rectangle (The selected line goes light blue) 3. Select the line by clicking the left mouse button. (The line turns red) 4. Select the opposite line, press, hold and drag the cursor to create the constraint outside the rectangle 5. Repeat on the other two lines that make up the rectangle 6. Double-click the left mouse button on a constraint to open the Properties dialogue window. 7. Enter a length of 200mm and repeat for the other constraint to make the width 80mm (section of the wood to be used). Turning the sketch into 3D feature 1. From the View menu choose Isometric
2. Choose the Extrude Profile tool 3. In the Extrude dialogue box check Above workplane, Add material, and Distance 40mm. The Taper Angle is not set (straight sides) 4. Select OK. Shaping the top surface of the block Fig 4. To be able to model on the top of the block ( drill holes and make recesses) the top of the block has to become the drawing surface.. 1. Choose the Select Faces tool 2. Select the top surface of the block (edge turns red). 3. From the Workplane menu select Plane of Object 4. Select OK to accept the name of Workplane 1 5. From the View menu choose Plan. Drilling Blind Holes Fig 6. 1. In the top surface circles for holding individual pencils can be placed. "create circle" 2. Choose the Create Circle tool 3. Drag out a small circle towards the front left of the top face 4. Choose the Constrain Size tool 5. Select the edge of a circle and drag out the constraint dimension 6. Double click on the constraint value of the circle 7. In the Properties dialogue box enter the Radius to 6mm
8. Choose the Select Lines tool to highlight the circle 9. From the Edit menu choose Duplicate 10. In the dialogue box enter X Direction number 4, Spacing 20mm and Y Direction 2, Spacing 20mm. (This will produce an array of eight holes spaces at 20mm between centres) 11. From the View menu choose Isometric 12. Choose the Extrude Profile tool 13. In the Extrude dialogue box check Below workplane, Subtract material, and Distance 35mm. 14. Select OK. To create a recess for paper clips or rubber Fig 7. 1. From the Workplane menu select New Sketch (This will give you a new drawing surface on the same plane) 2. Draw a suitably sized rectangle and a circle on the top surface 3. Use the Constrain Separation tool to size the rectangle (45 x 40mm) 4. Use the Constrain Size tool to size the circle (15mm) 5. From the View menu choose Isometric 6. Choose the Extrude Profile tool 7. In the Extrude dialogue box check Below workplane, Subtract material, and set the Distance to a suitable depth (e.g. 20mm) To create a recess slot for a ruler Fig 8.
1. From the Workplane menu select New Sketch (This will give you a new drawing surface on the same plane) 2. From the Part toolbar select the Create Rectangle tool 3. From the View menu choose Plan 4. Drag out a rectangle going from one end of the block to the other 5. Use the Constrain Separation tool to size the rectangle if necesssary 6. From the View menu choose Isometric 7. Choose the Extrude Profile tool 8. In the Extrude dialogue box check Below workplane, Subtract material, and Distance 35mm. 9. Select OK. Chamfering the edges on the top surface gives a professional finish and makes painting easier Fig 9. 1. Choose the Select Faces tool 2. Select the top surface of the block (edge turns red) 3. Choose Chamfer Edges tool 4. In the Chamfer Edges dialogue box enter the Setback size to 2mm 5. Alternatively selected edges can be chosen using the Select Edges tool and holding down the Shift key whilst selecting 6. From the File menu choose Save and save as Block Viewing the Design 1. From the View menu the following can be used to display the finished block o Isometric view. o Trimetric view. o Tumble view (the view is returned to normal on hitting any key) 2. From the Window menu choose Split 3. Selected a suitable point on the page to produce three orthographic view and a 3D view as well Designing a Backplate The backplate to the holder is drawn as a separate component and then assembled to the block
1. From the File menu select New 2. Choose Design 3. Select OK 4. Maximise both screens 5. Choose the Create Rectangle tool 6. Drag the cursor to create a long rectangle To constrain the rectangle to a set size Fig 10. 1. Use the Constrain Separation tool to create the constraints on the sides of the rectangle 2. Double-click the left mouse button on a constraint to open the Properties dialogue window 3. Enter a length of 200mm and repeat for the other constraint to make the width 6mm (section of the wood to be used) Extrusion - making the shape Three Dimensional Fig 11. 1. From the View menu choose Isometric 2. Choose the Extrude Profile tool 3. In the Extrude dialogue box check Above workplane, Add material, and Distance 200mm 4. Select OK. Viewing the Design 1. From the View menu the following can be used to display the finished block o Isometric view.
o Trimetric view. o Tumble view (the view is returned to normal on hitting any key) 2. From the Window menu choose Split 3. Selected a suitable point on the page to produce three orthographic view and a 3D view as well Designing a Backplate The backplate to the holder is drawn as a separate component and then assembled to the block 1. From the File menu select New 2. Choose Design 3. Select OK 4. Maximise both screens 5. Choose the Create Rectangle tool 6. Drag the cursor to create a long rectangle To constrain the rectangle to a set size Fig 10. 1. Use the Constrain Separation tool to create the constraints on the sides of the rectangle 2. Double-click the left mouse button on a constraint to open the Properties dialogue window 3. Enter a length of 200mm and repeat for the other constraint to make the width 6mm (section of the wood to be used) Extrusion - making the shape Three Dimensional Fig 11.
1. From the View menu choose Isometric 2. Choose the Extrude Profile tool 3. In the Extrude dialogue box check Above workplane, Add material, and Distance 200mm 4. Select OK. Shaping the front surface of the backplate Fig 12. To add some visual interest some of the top of the sheet can be removed. 1. Choose the Select Faces tool 2. Select the front surface of the backplate (edges turns red). 3. From the Workplane menu select Plane of Object 4. Select OK to accept the name of Workplane 1 5. Use a selection of lines, overlapping circles or rectangles to create a shape. Ensure sides and a top are added to create a continuous profile 6. Create a clean pr ofile using the Delete Selected Line Segments unwanted lines 7. Use the Undo icon if the wrong line is selected 8. From the View menu choose Isometric tool to remove 9. Choose the Project Profile tool 10. In the Project profile dialogue box check Below workplane, Subtract material, and Thru to next face 11. From the File menu choose Save and save as Backplate 12. From the File menu choose Close Assembling the Components
Fig 13. 1. From the File menu choose Open and choose Block 2. From the Assembly menu choose Add Component and find Backplate 3. When the component is added the two axes on the initial plane converge so it is likely that the objects will merge into each other 4. Choose the Select Faces tool select the front face of the backplate 5. Rotate the drawing using the cursor keys until the back of the block is visible 6. Hold down the Shift key on the keyboard and select the back of the block is also highlighted in red 7. From the Assembly menu choose Mate Planes which will join the front face of the backplate with the rear side of the block. 8. Choose the Select Faces tool 9. Select the end face of back plate and the end of the block 10. From the Assembly menu choose Align Planes, this should take the backplate into position 11. From the View menu choose Isometric Changing the colour Fig 14.
1. Choose the Select Parts tool from the parts menu 2. Select a component from the assembly, the whole part should be outlined in red 3. From the Assembly menu choose Set component colour 4. Select a colour from the range of colour choices 5. Select OK. To view the finished design Fig 15.