Part of Unit: Sectional Views
Lesson Plan Overview / Details
This lesson teaches the student how to create a half section view. The object being drawn is a typical step-v pulley, the kind used to power the various engine belts found on a car. The three following lessons will teach students how to dimension their drawing, create an isometric pictorial, and a solid model.
- Two class periods
- 140 Minutes
California Career and Technical Education Standards
- ED.C.C5.1 Understand the commands and concepts necessary for editing engineering drawings.
- ED.C.C5.2 Know the various object-altering techniques.
- ED.C.C5.3 Know the CADD components and the operational functions of CADD systems.
- ED.C.C5.4 Apply two-dimensional and three-dimensional CADD operations in creating working ...
- ED.C.C5.5 Understand how to determine properties of drawing objects.
- ED.C.C7.1 Understand the function of sectional views.
- ED.C.C7.2 Use a sectional view and appropriate cutting planes to clarify hidden features o...
- ED.FS.10.2 Understand the importance of technical and computer-aided technologies essential...
- ED.FS.10.3 Understand how to use, adjust, maintain, and troubleshoot the equipment and tool...
- ED.FS.11.0 Demonstration and Application
- ED.FS.5.1 Apply appropriate problem-solving strategies and critical thinking skills to wor...
- ED.FS.5.2 Understand the universal, systematic problem-solving model that incorporates inp...
- ED.FS.5.3 Use critical thinking skills to make informed decisions and solve problems.
California Academic Content Standards (Reinforced)
- ELA.9-10.R.CAGT.2.5 Extend ideas presented in primary or secondary sources through original analysis...3
- ELA.9-10.R.CAGT.2.6 Demonstrate use of sophisticated learning tools by following technical direction...2
- M.7.MG.1.2 Construct and read drawings and models made to scale.11
Objectives and Goals
- Students will understand the advantages of the half section view
- Students will work with ACAD "layers"
- Students will work with ACAD commands such as "copy, mirror, and hatch"
Activities in this Lesson
- Need for Half Section View - Hooks / Set
Show students the fan belt video clip. Next show students pictures of step-v pulley. Explain how the pulley drives the belts and why you would not want to do what is shown in the video-FINGERS! Hopefully they will now have an understanding of what a step-v pulley is.
Ask them if they feel they could draw up the plans for the object. They may feel the drawing would be simple, but what about the inside of the pulley? Unlike the previous solid objects they have drawn, this object is hollow with several internal features. In order to see these internal features in real life, we would need to cut a chunk out of the pulley. That is exactly what we will do with the drawing. We will draw the object as it would appear if one quarter of it had been cut out and removed.
- Advantages of the Half Section View - Lecture
Show students Fig. 5-7. Explain how the half section is created from two cutting planes at right angles to each other along the centerline. The half section is only useful on symmetrical objects because it is assumed that the exposed internal features are the same on both sides. Besides revealing the interior features, the main advantage to the half section is that it also shows the exterior features. That is; one drawing view is able to show both exterior and internal features. If the object is both symmetrical and cylindrical, the half section view is the only view necessary to completely describe the object, as is the case for the step-v pulley. The complete drawing should now be shown to the students. Also show them the solid model to help clarify their understanding of the object’s geometry. They will be creating the solid model last.
- Half Section.pdf [ Download ] Figure 5.7 (text book explanation of half section view)
- ACAD File 2000 Pulley [ Download ] Figure 5.7 (text book explanation of half section view)
- Complete drawing picture [ View Image ] [ Download Original ]
- Half section picture (the goal of this lesson) [ View Image ] [ Download Original ]
- Solid model picture [ View Image ] [ Download Original ]
- Setting up the Layers - Demo / Modeling
The first thing students will need to do is set up their layers as shown in this snapshot. If nothing else students need to be shown how to create and take advantage of the construction line layer. They must be required to first draw the object in construction lines (XLINE) on the construction layer without trimming. Then they need to trace over the construction lines in the object layer using a heavier line weight.
- Steps and commands required to complete the view - Demo / Modeling
When students are ready to begin creating lines they should start with the smallest diameter V groove. Once completed, they can use the COPY command to create the other two V grooves. This should complete the outer contour of the “section” half of the view. Next students should complete the interior geometry. Once all the geometry in the “section” half of the view is finished, this geometry should be reflected about the object’s center line using the MIRROR command. This newly mirrored geometry should be converted into a standard orthographic drawing which includes hidden lines. It is easy to convert the internal object lines to hidden lines by simply selecting them and then clicking on the Hidden Line layer in the Layers toolbar.
The Half Section view is now complete and students should move on to dimensioning. Please see the next lesson.
- Assessment Types:
- Projects, Observations,
Informal assessment is conducted through casual observation during student work sessions. The Formal assessment is made when the student turns in his completed drawing.