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ProDESKTOP - Advanced tutorial

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ProDESKTOP - Advanced tutorial

November 2001 DRAFT v1.0

    Pro/DESKTOP - Advanced tutorial

    Lofting

    Boat - Advanced

    August 2001 DRAFT v1.0

    Written These materials are ? 2001 PTC

    by

     Tim Brotherhood

    Conditions of use Copying and use of these materials is

    authorized only in the schools of

    teachers who attend official training

    with one of the above organizations.

    All other use is prohibited unless

    written permission is obtained from the

    copyright holder.

Acknowledgements John Hutchinson - TCNJ

    John Karsnitz TCNJ

    Kevin Dickey PTC

    Nick Beykirch Bernards High School

    Feedback In order to ensure these materials are

    of the highest quality, users are asked to report errors to the author.

    Suggestions for improvements and other

    activities would also be very welcome.

    Boat-Advanced page 2 of 38 ? PTC

August 2001 DRAFT v1.0

    Contents

    Pro/DESKTOP - Advanced tutorial ............................................................. 1 Lofting ................................................................................................................ 1

    Conditions of use ..................................................................................... 2

    Acknowledgements .................................................................................. 2

    Feedback ................................................................................................... 2 Contents ............................................................................................................. 3 Boat Advanced ............................................................................................... 6

    Prior knowledge required ....................................................................... 6 Design Considerations - testing ............................................................... 7 Sketching ....................................................................................................... 7

    Recap valid profiles ................................................................................. 7 Lofting ............................................................................................................ 7

    Background to lofting ............................................................................. 7

    Principles of lofting................................................................................. 8 Boat hull loft ..................................................................................................... 9

    Outline of the task ................................................................................. 9

    Offset workplane .................................................................................. 10

    Creating a sketch .................................................................................. 10

    Sketching a profile................................................................................ 11

    Hiding sketches...................................................................................... 11

    Drawing the transom ............................................................................ 11

    Making sketches visible. ...................................................................... 12

    Angled workplane ................................................................................... 12

    Starting a loft ........................................................................................ 14

    Adding sketches .................................................................................... 14

    Defining loft line .................................................................................... 14

    Completing the Loft .............................................................................. 16 Design considerations - manufacture ................................................... 16

    Shell the hull .......................................................................................... 16 Introduction to the solver Water bottle ............................................. 17

    Checking variables ..................................................................................... 17 Boat-Advanced page 3 of 38 ? PTC

August 2001 DRAFT v1.0

    Finding the volume ..................................................................................... 18 Design considerations ................................................................................... 19 Ounces, cubic inches and density .......................................................... 19

    Volume ...................................................................................................... 19

    Air gap ...................................................................................................... 19

    Converting ounces to cubic inches ..................................................... 19 Starting the solver .................................................................................. 20

    Selecting the goal ................................................................................. 20

    Setting the target volume ................................................................... 21

    Selecting the variable to change ....................................................... 21 Design considerations .................................................................................. 23 Golden Rectangle ...................................................................................... 23 Design rules ............................................................................................... 23

    Adding a design rule ............................................................................. 24 Floating and sinking ...................................................................................... 26 Design considerations - displacement ................................................. 26

    Fact or fiction? ..................................................................................... 26 Floating the hull ............................................................................................ 27 Design considerations - modeling.......................................................... 27 Finding the mass of the hull .................................................................. 28

    Changing the density............................................................................ 28 Design consideration ................................................................................ 28

    Volume and mass of the hull .............................................................. 29 Using the solver ........................................................................................ 30

    Volume of water .................................................................................... 30

    Starting the Solver .............................................................................. 30

    Setting the goal ..................................................................................... 31

    Selecting the input variable ................................................................ 31 Design considerations Hollow boat .................................................... 33

    Lofting issues correcting faults ............................................................ 34

    Number of nodes .................................................................................. 34

    Deform/shell from lofted surfaces ................................................. 35 Boat-Advanced page 4 of 38 ? PTC

August 2001 DRAFT v1.0

    Straight sides ....................................................................................... 35

    Splines ..................................................................................................... 35 Design Challenges ..................................................................................... 36 Boat hulls .................................................................................................... 36 Aircraft wings and fuselage. .................................................................. 36 Liquids and the surface of fluids ......................................................... 36 Landscapes ................................................................................................. 37 Containers .................................................................................................. 38

Boat-Advanced page 5 of 38 ? PTC

August 2001 DRAFT v1.0

    Boat Advanced

    Aims of the Unit

    ; Learn how to use the loft feature to create shapes with complex

    curved surfaces and then control the form of models using

    variables and design rules.

    ; Use the album to represent materials.

    Performance Indicators

    Students will be able to:

    ; Develop awareness and capability creating and editing lofted

    features.

    ; Create and edit offset and angled workplanes.

    ; Create constraints and edit variables to alter the form of a

    design.

    ; Use the solver to achieve a specific volume or other parameter; ; Create and edit design rules to control a design. ; Consider a range of uses for the loft feature.

    ; Use the album to represent materials including water.

Prior knowledge required

    Understanding of workplanes and sketches.

    Competence in creating and editing design constraints Capability to create and edit sketches to form valid profiles.

Outcomes

    ; A boat hull will be created using the loft feature.

    ; Variables will be edited to alter the size and shape of the hull.

    ; Design rules will be used to identify the water line (and floating attitude) of the boat.

    ; The hull will be assembled into a water tank and rendered in the album.

Boat-Advanced page 6 of 38 ? PTC

August 2001 DRAFT v1.0

    Design Considerations - testing

    Key considerations for the shape of a hull include resistance to movement, displacement, freeboard and stability.

    Designs produced in Pro/DESKTOP can be machined and pulled along a test tank or piece of guttering to see how efficient they are. Fair test?

    You must make sure the towing force is consistent when testing alternative designs. How could you ensure this?

    Sketching

    Lofting is an advanced feature of Pro/DESKTOP and relies on 2 or more profile sketches. Each sketch must form a valid profile. Recap valid profiles

    Recap: A valid profile is a closed loop of lines. There must not be any gaps in the loop of lines or any overlapping lines. A useful analogy is to describe the line as an elastic band. It can only follow one path around the sketch and cannot have any breaks. Note: While profiles for extrude and revolve features can have inner loops (nested shapes) that define holes in the object, loft sketches will not work with inner loops.

    Lofting

    Background to lofting

    Many ships are constructed from vertical frames or bulkheads at regular intervals along the vessel with an outer skin fixed to these frames. Lofting is a nautical term that describes this process of using a number of cross-sections to construct the shape of the boat hull.

    Boat-Advanced page 7 of 38 ? PTC

August 2001 DRAFT v1.0

    Picture of boat hull with cutaway to show frames.

    Accurate templates are needed to mark out the shape of each bulkhead and these can be very big. In order to mark out and cut the templates, a room with a large clear floor space is required. The room that most often fits these criteria is the roof space or loft. Lower floors have pillars to support the weight of the floor and machinery above.

    Picture of shipyard building

    Over hundreds of years the process of drawing the gentle curving shapes and templates for a new ship has become known as 'lofting'.

Principles of lofting

    A simple way to explain the loft command refers to the way many modern ships and boats are constructed.

    Ship illustration Description ProDESKTOP

     A series of frames are

    cut to the cross

    sectional shape of the

    hull at a number of

    positions along the length of the boat.

    Frames are spaced

    apart at the correct

    distances.

Boat-Advanced page 8 of 38 ? PTC

August 2001 DRAFT v1.0

    Sheet material is fixed

    to the outside of the

    frames to create a skin.

Note: The Loft feature in Pro/DESKTOP creates a solid. The shell

    command can then be used to hollow the solid hull shape.

Boat hull loft

    Outline of the task

    Three workplanes will be used. All three are

    offset, but the third

    workplane is also angled.

Profile sketches are

    drawn on each workplane.

    The sketches are used to create the lofted solid.

The solid shape is then

    hollowed to produce a

    recognizable hull for a

    small dinghy.

    Boat-Advanced page 9 of 38 ? PTC

    August 2001 DRAFT v1.0

    A design has been started for you.

    ; Open the file called Dinghy.des

    The design contains one workplane

    called Central with a sketch named

    Center. This has a profile for the

    middle of the dinghy.

    Offset workplane

    An offset workplane will now be created for the stern of the hull.

    ; Open the Workplane pull-down menu and select New Workplane. ; Drag the yellow

    handle until the

    new workplane is a

    distance of -50

    mm behind the

    existing one.

; Make sure the

    Offset distance

    reads -50.

    ; Change the

    workplane name to

    Rear

    ; Click .

    A new workplane created in this way does not contain a sketch.

    Creating a sketch

    ; In the Workplane browser, right click over the Central workplane. ; Select New sketch from the floating menu. ; Name the sketch Transom

    ; Click on .

    Boat-Advanced page 10 of 38 ? PTC

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