This publication, the third in a series on drafting, is intended to strengthen students' competence in the specialized field of mechanical drafting. The text consists of instructional materials for both teacher and students, written in terms of student performance using measurable objectives. The course includes 11 units. Each instructional unit contains some or all of the basic components of a unit of instruction: performance objectives, suggested activities for teachers and students, information sheets, assignment sheets, job sheets, transparency masters, tests, and answers to the tests. Units are liberally illustrated and are planned for more than one lesson or class period of instruction. Information for the teacher includes an instructional/task analysis of mechanical drafting, a list of tools, material, and equipment needed, and a reference list. Topics covered in the 11 units are the following: orientation; tools and equipment; reference materials; layouts and working drawings; dimensioning and tolerancing; fasteners and hardware; presentation drawings; materials and specifications; manufacturing processes; sheet metal developments; and power transmission. (KC)