1. ME110- Introduction to CAD
Craig R. Ronald
Gavett 244

2. Course Format
PTC Creo
Industry recognized leader in mechanical design software.
Focus on solid modeling, detailing and assemblies.
MicroStation- Ranked number 1 by PC magazine etc.
How many have had drawing?
How many CAD? Computer experience?
Half the number of homeworks (5), half the number of tests (2)
Review outline. Flexible because of new format. New mailbox thing.
Textbook useful for review, but is not needed for homework or tests
Explain benefits of helping each other.

3. Design Examples
Astin Martin
KTM Motorcycles
Artificial Heart

4. Design Examples
Guitars
Komatsu Construction

5. About the Instructor MS Mechanical Engineering U of R 1990
Taught ME110 since 1987
Used PTC Creo since 1997

6. Importance of Course Only a 2 credit course but...
Teaches the language of engineering
Skill that is most likely to help job search

7. Web Site Link is on Blackboard The web site will be kept up to date
Link is on Blackboard
The web site will be kept up to date
Check frequently! You are responsible for knowing the information on the site.

8. Blackboard
Log on at: learn.rochester.edu
Assignments
Grades

9. Course Outline Phone numbers 259-6119 Cell(‘til 10PM)

10. Saving Work for Course Flash Drive
you will need to have a USB flash drive by next lecture.
All HW and test files must be saved
Must be able to show the original files in case of grading disputes.

11. Academic Honesty
All assignments and activities associated with this course must be performed in accordance with the University of Rochester's Academic Honesty Policy. 
Suspected violations will be pursued vigorously following the College’s procedures for suspected cases of academic dishonesty.
Collaboration on homework is encouraged
Each student must create and submit their own file while logged onto their own NetID
Sharing files, data, or accounts on homework or tests is prohibited.

12. Conclusion
SAVE YOUR WORK
DON’T CHEAT

13. Six View Orthographic Projection
Multiview Projection
Adjacent views are reciprocal- Always lined up
Show Height, Width, Depth
Front view- Shows operating position

14. Three views are usually sufficient
Minimum views necessary to describe the part

15. Choice of views
least hidden lines
clarity
only necessary views

17. Precedence of Lines
Visible
Hidden
Center

19. Meaning of lines intersection of 2 surfaces edge view of a surface
contour of a curved surface

21. Section Views Use section views to eliminate hidden lines.
All visible lines behind plane shown.
Hidden lines are rarely shown.

22. Types of CAD systems Wireframe- modeling the curves of the part
Surface modeling- Model the surfaces of the part, but without knowledge of material.
Solid modeling- full solid representation
Parametric Modeling- dimension driven solid modeling.

23. Solid Modeling What is a solid model?
A three dimensional representation of geometry that includes the shape definition of the geometry as well as a definition of inside and outside.

24. Why use a solid modeler?
Intelligent modeling- modeler can understand concept like through, through until, etc.

25. Accurate Detailing
Hidden lines
Section views
Auxiliary views

26. Manufacturing-
Tool paths may be made directly from the model.

28. Interference checking

29. Finite Element Analysis
Ability to do Deflection and stress analysis on complex parts/assemblies.
Complex problems are discritized into simple shapes.

31. Rapid Prototyping Stereo Lithography
Light setting polymer is built up layer by layer with a laser.

32. 3D Printing
Plastic printing from a spool of material

33. 3D Printing
Inkjet printer glues together layers of Stainless steel powder.
Sintering binds the powder.

34. Demo

35. Types of Solid Modeling
B-REP– Boundary representation
The solid is defined by the surfaces bounding the volume as well as inside and outside definition. (outward unit normal)

36. Types of Solid Modeling
CSG- Constructive Solid Geometry
Primitive solid shapes joined together with Boolean operators define the solid. The model is stored with a tree structure.
Boolean operators are three-dimensional set operators (union, difference, and intersection).

37. Set Theory
Union
Difference
Intersection

38. CSG- Constructive Solid Geometry