CAID2 Advanced level step 2

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This 3-point course is in the first year of Master and is a part of "Advanced Computer Aided Modeling and Visualization". (The other part is CAD)

The CAID program used is Autodesk Alias Automotive on Windows based workstations.

Goal and contents

Students are given training in CAID on a deeper level in order to be able to create advanced 3D models and make effective visualizations.

The aim is to give a more in depth knowledge of the tools in a CAID program.

Concepts covered:

Understand the different modeling strategies available to maximize modeling efficiency.
Determine the softwares role in the design workflow.
Customize construction tolerances and linear units.
Construct efficient curves with optimal parameterization and minimal geometry
Define G0, G1, and G2 continuity and the importance of each to curve and surface construction
Manipulate curves using the tools found in the curve edit palette
Understand the criteria for primary and transitional surfaces
Construct primary surfaces using the set planar, revolve, skin, extrude and monorail surfacing tools

Construct transitional surfaces using birail, square, fillet and round
Understand when and where the options related to continuity and rebuilding of surfaces should be applied
Edit surfaces using freeform CV pulling and precise manipulation methodsEvaluate curves and surfaces to ensure desired curvature and continuity characteristics.  Create stitched models for Boolean operations or output to solid modeling packages


Understand the process of data transfer as it relates to their designs to other CAD systems. An overview of the merits and limitations of various file transfer formats (i.e.: IGES, STEP etc.), tips and traps will be provided
Prepare models for successful rapid prototyping output

 

Prerequisites

Completion of CAID 1

Form of tuition

Tuition is in the form of lectures and practical training under the supervision of tutor. In the computer lab, exercises will be carried out under the guidance of authorized teacher. All sections in the course are obligatory.

Examination form and marks

Examination is in the form of individual practical tests and presentation of results of the given exercises at the school.

In order to obtain credit for the 3-points course, all sections and assignments must be successfully completed. Students receive a mark of either Pass or Fail for each assignment and section. For those students who do not receive a mark of pass, another opportunity is provided to pass the assignment or examination after a period of time.

Exercises to be completed

1. Export a "Mixed" Rapid Prototyping (stl)  file(s). Renderings and pictures from (the old)  NetFabb basic (free) showing it is a "leakage free" model. Real life scanned data has to be used and combined in some way. Photo, laser or IPad-scanner can be used.

 Image from  georgehart.com

IPad _ScanningIPad 3D-Scanning 101

Open _IPad _scanned _file _GIFOpen an IPad scanned file in Meshmixer

MeshMixer Tutorial Part1 : Modeling for 3D Printing

Layer by Layer - How To Make Voronoi Patterns in MeshMixer

Makehuman.org If you need a special model!

 

VIUscan _250px Laser scanning

 

Assignment #1
Combine NURBS and polygon models for 3D-printing.

 

Tasks. Compulsory

  1. Scan  an object or person (polygons, mesh).Real life scanned data has to be used.
    Use Laser scanner,     Laser scanning
    IPad-scanner or        "IPad-scanning", structured light
    Photogrammetry.       Comparasion of photogrammetry softwares
  2. Add your own NURBS object use Alias (NURBS surfaces)
  3. Download  and add a Solid model, Surface models or polygon model is ok. Clean it and make it leakage free.

Combine (UNION) it all into a 3D-printable file  :)

  • Correct size. Able to fit into the machine. (Usually smaller than 300mm)
  • Use Boolean action UNION
  • Check with the "X-ray shader" if there is any internal volumes. It should only be ONE volume!
  • Check for holes and gaps. Meshmixer > Analyze > Inspector
  • Enough strength! Walls has to be from 0.3 to 3 mm depending on machine and material
  • The  Normals has to be correct
  • If the model looks rough  then you might like to add more polygons. If you have to many polygons then reduce the number of polygons.
  • Export a STL-file (choose binary because it will be smaller)
  • Check the file size! If above 20mb then Meshmixer > Select. Ctrl-a. Select > Edit > Reduce. Max Deviation, Shape preserving

 Need more challenge? Voluntary! (not needed to pass)

  • Make moving parts. Remember to have an "air-gap" between them!
  • Try out the Tinkerplay connectors. Meshmixer > MeshMix > Tinkerplay connectors
  • Prepare the file for different materials on one model. Use the Complex tool.
  • "Borrow" a foot, head or hand for your 3D-model by using MakeHuman. Make a 3D-model and cut off the piece you need :)

Upload:

One (1) Alias wire file

One (1) STL file for 3D-printing

One (1) A Netfabb Screen dump without any errors

One  (1) Simple Keyshot (or VRed) Rendering

  

 

 

2. Modeling and rendering a MC Fairing

 

Assignment #2 MC-fairing, Curvature Continuity everywhere :)

TN_Fairing .persp Fairing Black Green

Here  is some hints.

Tasks. Compulsory

  • Build a side of a motorcycle
  • Real life scale
  • Use the images  on this web page as background
  • Make curves for the basic profile
  • Use a BLEND CURVE for shaping the middle of the upper surface 
  • Add a recess on the upper half (a bump inwards)
  • Add a flared surface on the lower part (a bump going outwards)
  • Make an air intake on the main surface
  • Make shure that you have achived Curvature continuity everywhere! :)

 Need more challenge?  Voluntary! (not needed to pass)

  • Download  some motorcycle parts  and add them to your model for improved images
  • Use decals
  • Add some rust  and scratches
  • Add a human hand or a leg  close to the MC-fairing. Maybe a helmet on top of the tank. MakeHuman  can help you.
  • Try artistic lightning effects

 Upload (minium) 4 files:

One Alias wire file

One image showing green "C" for ALL boundaries, also for the symmetry

One image showing the symmetry with the Zebra shader applied

One  KeyShot Rendering

 

 

 

3. Export Milling files (step or iges) and pictures showing the objects position in space. Use your flashlight or own 3D-model.

 

Assignment #3 Export Milling files for Professional Milling Machines

  Mill 

 

Tasks. Compulsory

  • Choose an already made model to start with! For example the MC-fairing
  • Follow the schools Milling guide. How to get the Milling Machine to work for you
    In the Milling Guid it says that you need to send an email but
    you do not need to send an email when doing this assignment.
  • Accomplish a ready to mill Iges  or Step file (Occasionally STL or OBJ can be used)

 Upload (minium) 4 files:

  • One Alias wire file
  • One Milling file. Iges or Step format
  • One image showing
    • the models positioned for Milling (flat on the grid)
    • with a measurement of the maxium model height
    • the SIZE of the milling TOOL  (usually a diameter between 6 to 20 mm)
  • Two renderings of the original and complete model (not the milling file)

To Pass

  • Save pictures and 3D-model files with Cambro.
  • TIFF orPNG-format for the pictures
  • 1280x1024 pixels size
  • Alias, STL, IGES and STEP format for the 3D-files
  • Upload all files through the CAMBRO portal:  CAMBRO log in
    CAMBROloginENG

 

Place

Top PC Lab
Located in the top floor of the administration building at the left.

Student computer lab time
Monday to Friday 0900 to 1600

  • Wednesday 0900 to 1200

Tutor computer lab time
Monday to Friday 0900 to 1400
Wednesday and thursday 0900 to 1200

Resources:

 

3D Web Links (free stuff to download)

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