Copyright Goodheart-Willcox Co., Inc. xvi Print Reading for Industry Unit 18 Gears, Splines, and Serrations . 359 Spur Gears . . . . . . . . . . . . . . . . . . . . . . . 360 Bevel Gears. . . . . . . . . . . . . . . . . . . . . . . 363 Worm Gears . . . . . . . . . . . . . . . . . . . . . . 364 Splines and Serrations. . . . . . . . . . . . . . . 364 Unit 19 Cam Diagrams and Prints . . . . . 375 Cam Terminology. . . . . . . . . . . . . . . . . . . 376 Cam Displacement Diagrams . . . . . . . . . 379 Follower Motion . . . . . . . . . . . . . . . . . . . . 379 Reading Cam Prints. . . . . . . . . . . . . . . . . 380 Unit 20 Plastic Parts . . . . . . . . . . . . . . . . . 387 Materials in the Plastics Industry. . . . . . . 388 Processes in the Plastics Industry. . . . . . 389 Fastening and Joining Plastics . . . . . . . . 391 Plastics Terminology . . . . . . . . . . . . . . . . 391 Reading Prints from the Plastics Industry 392 Unit 21 Precision Sheet Metal Parts . . . 403 Bending Terms. . . . . . . . . . . . . . . . . . . . . 404 Sheet Metal Drawing Terminology. . . . . . 406 Calculations and Layouts. . . . . . . . . . . . . 407 Setback Charts . . . . . . . . . . . . . . . . . . . . 408 Bend Allowance. . . . . . . . . . . . . . . . . . . . 409 Layout and Fold Procedure . . . . . . . . . . . . 411 Reading Precision Sheet Metal Prints . . . . 411 Unit 22 Welding Prints . . . . . . . . . . . . . . 421 Welding Defined . . . . . . . . . . . . . . . . . . . 422 Welding Drawings . . . . . . . . . . . . . . . . . . 422 Supplementary Symbols . . . . . . . . . . . . . 425 Other Applications . . . . . . . . . . . . . . . . . . 426 Unit 23 Instrumentation and Control Drawings . . . . . . . . . . . . . . . . . 435 Diagram Types. . . . . . . . . . . . . . . . . . . . . 436 Instrumentation and Control Diagram Terminology . . . . . . . . . . . . . . . . . . . 437 Supplementary Information . . . . . . . . . . . 439 Reading a Graphic Diagram . . . . . . . . . . 439 Appendixes Appendix A Applied Mathematics . . . . . . . . 455 Appendix B Measurement Tools . . . . . . . . . . 471 Appendix C Basic Technical Sketching and Lettering . . . . . . . . . . . . . . . . . 491 Appendix D Sketching Pictorial Drawings . 509 Appendix E Abbreviations and Tables . . . . . 525 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . 548 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 564