BA 3D-scanning, Milling & Rapid Prototyping

Getting digital models into physical ones and reverse!

This 1.5-point course is in the third year of Bacheler and is a part of the course Designpresentation 3 5ID172.

Used CAD programs are Rhino, Autodesk Alias Automotive, Mudbox, Meshmixer, ReMake, Netfabb, Meshlab and SolidWorks. (123D Catch can not be used anymore)

Goal and contents

Students are given training in: 

  

  • "Catching" real life object into 3D digital computer models. CAID on a wider level in order to be able to create advanced 3D models.

 

Catch _250px

  

  • Knowledge of making physical prototypes with CNC-milling machines and Rapid Prototyping machines.

 

 

 The aim is to give a knowledge of how several CAD tools is used together for the above purposes.

Concepts covered:

The difference between different CAD-formats:

  • Pointcloud
  • Meshes, Polygons
  • NURBS
  • Solids

Understand when and why these 3D-format are used

The different modeling paths available to maximize modeling efficiency.

Some different 3D-measuring technologies as:

 

  • Laser scanning
  • Structured light scanning
  • Photo "scanning"
  • Measuring arm

 

Knowledge about the softwares role in the prototyping workflow.

Importens of construction tolerances and linear units.

Clean exporting of your model for prototype making.

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, STL, OBJ etc.), tips and traps will be provided

Prepare models for successful rapid prototyping output

 

Prerequisites

Completion of Rhino course (BA2)

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 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 Milling  files for the
bigger Pro milling machines, STEP or IGES

Preparation of files in Rhino (in Swedish)
Preparation of files in SolidWorks (in Swedish)

  • Make a SIMPLE 3D-model. With maxium size 110x80 Height 40 mm
  • One STEP file
  • One IGES file
  • One picture (max 5Mb)

Tool diameter 8 mm
Space between parts about 9 mm!

  Mill _Assignment _TL01

Rums Termostat 

 

2. Export Milling  file, STL or IGES-format,  for the small Roland milling machine

  • Use a SIMPLE 3D-model. With maxium size 110x80 Height 40 mm
  • Use the SRP-player  to make the milling pathes.
  • One STL file or IGES. Yes STL-format is alright!  :)
    STL is usually only for Rapid Prototyping but the Roland milling machine like STL :)
  • One picture. A screen dump from the Roland software SRP-player (max 5Mb).
    The milling paths should be visiable!

.

SRPplayer _250px

3. Scan an object


Photogrammetry

Comparison of photogrammetry software

  • One STL or OBJ file that is
    • scaled to a proper size
    • cleaned and
    • positioned in 3D

 

Some Videos:

CleanUp and repair long 20min
Repair Demo

 

  • One picture showing your object in 3D-space with X, Y and Z-axis

 IPad _Scanning

 Open _IPad _scanned _file _GIF

VIUscan _250px

 

4. Export Rapid Prototyping (STL)

  • Combine the scanned object with something you model
  • Scale it to fit in a Rapid Prototyping machine
  • Leakage free! Fill all holes
  • Non fragile! You can not make infinitialy thin objects ;) A knife must have a rounded edge..
  • Smooth! To few polygons make it rough. Export with more polygons (heavier mesh).
  • Non silly file size! 1-10mb is usually enough. Above 30 mb is overkill.
  • One STL file
  • One picture from NetFabb basic  showing an error free model.

To Pass

Save a picture and a 3D-model file for each assignment.

  • 5 Mb maxium size for the pictures!
  • 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:

 Meshmixer tutorials:

 Mudbox tutorials:

MakeHuman:

School pages:

 

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