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COURSE OUTLINE

ENT 131 Mechanical Drawing I

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8. COURSE OUTLINE:
I. The care and use of drafting equipment
(A) Drafting Machines
1.  Indexing 15o
2.  Setting degrees
3. Setting degrees and minutes
4. Reading vernier
(B) Pencils, leads, sharpeners and compass
1. Selecting proper lead weights for proper lines
2. Producing proper points
(C) Templates and Triangles
1. Circle and isometric templates
2. Triangles
(a) 45o
(b) 60o ‑ 30o
(D) Tape, erasing shield, and french curves
1. Use of each item
2. Care
II. Basic drafting techniques
(E) Angles
1. Meeting corners correctly
2. Measurement
(F) Alphabet of line quality (Industrial Standards)
1. Object lines
2. Center lines
3. Hidden lines
4. Section lines
5. Phantom lines
6. Cutting plane lines
(G) Radii & Diameters
1. With compass
2. With circle templates
(H) Scales-Reading
1. Scales on the drafting machines
2. Mechanical Drafter's scale
III. Lettering
1. Size
2. Style
3. Line weight
  NOTE: Units one and two will be lectured on and demonstrations given.  Then the student will draw basic problems, at which time he/she will demonstrate to the instructor that he/she understands the use of the drafting equipment and the basic drafting techniques.
IV. Orthographic Drawing (Multi‑view Drawing)
(A) Views needed (selection)
1. Cylindrical parts
2. Square or rectangular parts
3. Where detail is located
4. How dimensioning will be added
5. Spacing on paper
6. Title block and notes
(B) Projection
1. Top to front views
2. Front to side
3. Side to front
(C) Industrial Standards
1. Line quality
2. All detail shown
3. View all projects
  NOTE: After the lecture and demonstrations the student will demonstrate that he/she can produce and understand Orthographic drawing to the instructor's satisfaction by drawing projects as the instructor deems necessary.
V. Section Views
(A) Does mechanical part required a section view
1. Internal parts not shown
2. Hidden features and views selection
(B) Section types
1. Full
2. Half
3. Broken out
4. Removed/revolved
5. Offset
6. Aligned
(C) Section lines
1. Weight
2. Spacing
3. ANSI fill patterns
(D) Cutting plane
1. Line Weight
2. Type
3. Placement
VI. Auxiliary Drawings
(A) Reference Planes
1. horizontal
2. frontal
3. profile
(B) Projection of ellipses and curves
1. measurement
2. projection
(C) Projection of planes
VII. Dimensioning Fundamentals
(A) Extension lines
(B) Dimension lines
(C) Leaders
(D) Line qualities
1. Weight
2. Length
3. Spacing
(E) Placement of dimensions
1. Spacing
2. Lettering size
3. Importance of dimensions
4. Dimension related to tolerancing
5. Dimension related to manufacturing
(F) Proper dimensions
1. Angles
2. Chamfers
3. Radii
4. Finishes
5. Holes
6. Special features and operations
(G) Checking dimensions
1. Addition
2. Double dimensions
3. Missing dimensions
4. Stack up of tolerances
(H) Notes
1. Sizes
2. Finishes
3. Special machining processes
I. Title block
1. Name & Date
2. Scale
3. Tolerance
4. Quantity
5. Drawing Numbers
6. Drawing Description (Name)
  NOTE:  After lectures and demonstrations the student will produce an orthographic drawing and dimension it showing all dimensions so that part can be manufactured.  This will be done to the instructor's satisfaction and industrial standards.
VII. Isometric Drawing
(A) Proper angles and views
(B) Isometric box method
(C) Measurement
1. Locating points from corners of isometric box
(D) Vertical lines and planes
(E) Angles
1. Must use point to point method
2. Locate points from corners of isometric box
(F) True Isometric Ellipses
1. Using isometric templates on
(a) Frontal planes
(c) Horizontal planes
2. Threads
(a) Use of template
(G) Sketching
1. Line weights
2. Proportions
3. View