Drawing Problems - Chapter 6 Copyright Goodheart-Willcox Co., Inc. Chapter 6 Model Extrusions and Revolutions 147 Problems 2–7. These problems require you to use a variety of solid modeling methods to construct the objects. Use EXTRUDE, REVOLVE, solid primitives, new UCSs, Boolean commands, and editing tools such as extrusions and revolutions to assist in construction. If appropriate, apply geometric constraints to the base 2D drawing. Do not create section views. Do not add dimensions to the models. For objects that have dimensions with tolerances, use the base dimension from which the upper and lower limits are calculated to create the model. Save each drawing as P6-(problem number). 2. Mechanical 3. Mechanical Valve Pin Spring Clip