Mechanical Drawing

MECHANICAL DRAWING Course Outline

Learning Outcomes

Course Objectives: The learning outcomes for this course are consistent with the requirements outlined in the National Occupational Skill Standards, the American National Standards Institute (ANSI), and the International Organization for Standardization (ISO).

Sectional Views  Describe the concept of a sectional view  Define what is meant by a cutting plane  Identify seven types of sections (full, half, broken-out, revolved, removed, offset, and aligned)

 Draw the following sections: full, half, broken-out, revolved, removed, offset, aligned, thin wall, and assembly  Demonstrate the proper techniques for the following in sections: ribs, webs, spokes, fasteners, shafts, and keyways  Demonstrate the proper technique for drawing an aligned section  Demonstrate correct hidden-line practices in section views  Recognize and draw the correct section-lining symbols for 10 different materials

Spatial Visualization and Multiview Drawings  Demonstrate proficiency in the use of spatial visualization by constructing an orthographic multiview drawing  Demonstrate proficiency in the five steps of planning a drawing  Demonstrate proficiency in making proper use of technical drawing conventions using ANSI standards  Construct an orthographic multiview drawing using English and metric units

 Prepare a drawing sheet including border, title block, revisions block, and bill of materials

 Select the minimum required views that best show the essential contours or shapes and have the least number of hidden lines  Use conventional dimensioning standards to describe size and shape accurately on an engineering drawing  Dimension a technical drawing using the aligned and unidirectional dimensioning systems

Threads and Fasteners  Define and label the parts of a screw thread  Identify and list the various screw thread forms  Distinguish between single and multiple threads  Explain the difference between right and left handed threads  Draw detailed, schematic, and simplified threads in sections and elevation using ANSI standards

 Define the components of a typical thread specifications  Identify various fasteners and describe their use  Define the components of a typical specification for bolts, washers, and nuts

1  Draw standard bolts, studs, and screws according to manufacturer’s specifications

 Draw hexagon head, flat head, round head, and fillister head screw head types

 Draw square, flat, and woodruff keys according to manufacturer’s specifications

 Draw full-length tapered grooved fasteners according to manufacturer’s specifications

2 MECHANICAL DRAWING Course Outline

Learning Outcomes

Working Drawings  Identify the elements of a detail drawing and create a simple detail drawing complete with annotation

 List the common elements of a title block and record strip  Construct a bill of materials including purchased parts  Create a typical drawing sequence of numbers  Describe the process for revising drawings  List the parts of an assembly drawing  Construct an assembly drawing of a machine unit  Construct an exploded assembly drawing of a machine unit  Construct a set of working drawings of a machine assembly including assembly drawings, detail drawings, bill of materials, revisions block, part specifications, and general notes

Tolerancing  Interpret and create limit dimensions  Describe the nominal size, tolerance, limits, and allowances of two mating parts

 Identify a clearance fit, interference fit, and transition fit  Describe the basic hole and basic shaft systems  Dimension two mating parts using limit dimension, unilateral tolerances, and bilateral tolerances

 Describe the classes of fit and give examples of each  Draw geometric tolerancing symbols  Specify position and geometric tolerances  Apply the American National Standard Limits and Fits between mating parts on a drawing

 Apply the International Organization of Standardization (ISO) tolerances between mating parts on a drawing