ENME 414 Computer Aided Design
Homework Assignment 3 - Dimensioning and Tolerancing
Due 9:30 am, Tuesday, September 24, 1996

Statement: Engineering drawings provide the manufacturing department with the
information necessary for producing the designed parts. Therefore, it is important that the
dimensions be clear and complete. When dimensioning the part under design, think of the
manufacturing process to produce it. Tolerances must also be placed on the dimensions of
a designed part. It is very difficulty, not impossible, to manufacturing a part exactly to
given dimensions. A small tolerance results in greater ease of interchangeability of parts,
but it also adds additional costs to the product realization process. In this homework
assignment, you are asked to use window-based CAD tools. These CAD systems are
most commonly used because of affordability. These CAD systems are mainly wire frame
systems, run on the PC platform. It is for this reason we begin our exploration of CAD
with a PC based wire frame system; CADKEY. It will be necessary to be familiar with
wire frame systems in the job market.

Assignments: Create the front and sectional views of the two parts shown below using
CADKEY. Dimensions and tolerances are needed based on your judgment. In addition
the rendered isometric image must also be created. Make use of the software's features to
limit the amount of work you need to perform.

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