Introduction to CAD Grade: 9 - 12
Date Created: June 24, 1999
Resources Needed: Tape measure, 1/4" grid sketch paper,bench model scroll saw,bench model drill press,floor model bandsaw
Classroom Arrangement: One computer station per student
Versa Cad loaded on each computer
Lesson Plan Duration: 3-4 class periods
Special Directions: Students will have completed a Versa Cad Tutorial and will have adequate CAD skills to complete the required drawings.
ANTICIPATORY SET: A company manufactures a product that needs to be shipped in large quantities to various warehouses across the nation.
They need this product placed in individual boxes so that the maximum number of boxes can be placed on a 47" x 47" pallet and stacked no higher than 48" on the pallet.
OBJECTIVE/PURPOSE: The students (groups of 2 or 3) will design the box that will contain the entire product. Students will utilize (1) Design processes, (2) Space relationships, (3) Measurement skills,
(4) Math skills and (5) CAD drawing skills. The THINKING SKILL that will be utilized is PROBLEM SOLVING.
STEPS IN THE PROCESS:
Identify the goal you are trying to accomplish.
Identify the constraints or limiting conditions.
Determine exactly how these constraints or limiting conditions are preventing you from reaching your goal.
Identify different ways of overcoming the constraints or meeting the limiting conditions.
Select and try out the alternative that appears to be best. Evaluate the effectiveness of the alternative you have tried.
INPUT: The students will divide into groups. The individual groups will select a product from a prearranged set of choices. The students will examine the finished product and note sizes shapes. In addition, with teacher approval, they will note where the finished product can be divided into one or more sub- assemblies so that the unit can be made more compact for packaging. However, all components must be included within one overall container. The boxes must alternate directions for each course placed on the pallet so that an interlocking affect is produced.
MODELING: An example of a product that utilizes maximum palletizing is the 12 pack of pop. The cardboard container measures 5 x 7 3/4 x 10 1/2. If stacked on a 3l 1/2 x 31 1/2 pallet, it could be stacked 9 courses high for a total of 108 12 packs. Three pallets setting side by side can be placed across the width of a standard 8 foot truck.
CHECK FOR UNDERSTANDING: Students will be given the opportunity to ask questions and state their concerns. Students will give examples of products that they have seen on pallets that allow for maximum shipping efficiency.
GUIDED PRACTICE: Students will make freehand sketches showing the layout,the dimensions and the isometric view of how the box contains the components. A freehand sketch showing how multiple boxes will fit on the pallet will also be required.
INDEPENDENT PRACTICE: The students will use CAD drawing to show:
1. Layout view of the box with dimensions
2. The assembled view of the box with dimensions
3. The pallet showing stacked boxes and dimensions
CLOSURE: The finished project will be evaluated on :
1. How compact is the finished box
` 2. How well is the pallet maximized
3. The neatness, accuracy and completeness of CAD drawings
4. Preliminary sketches and calculations