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It covers how drawings present dimensions in fractional inches, decimal inches, and metric units, and explains the information typically shown on a drawing. The chapter distinguishes detail, subassembly, and assembly drawings, clarifies why drawings are numbered, and introduces geometric dimensioning and tolerancing basics. 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Since it would not be possible to manufacture complex products without them, the machinist must  \nknow how to obtain and understand all of the information provided on drawings.  \nWith the increasing use of computer-generated machining programs, drawings may not always be available to the machinist at the workstation. Often times, the machinist only sees a“drawing” on the computer monitor and the computer program makes corrections and adjustments or alerts the machinist to possible problems. However, the machinist may have to refer to the drawings to determine what adjustments and changes are acceptable. For this reason, it is of vital importance that a machinist be able to read and understand drawings.  \nHave students read and study Chapter 3. Review the assignment and discuss the following:  \n• Importance of drawings to ensure that parts, no matter where they are made, will be interchangeable and fit properly in new assemblies and in similar assemblies made at an earlier date.  \n• Reason for standardized symbols, lines, and figures.  \n• The importance of the American National Standards Institute (ANSI) .  \n• The Alphabet of Lines.  \n• Symbols revised by ANSI and the symbols they replace.  \n• Information found on drawings and how it is used.  \n• Types of drawings used in shops.  \n• Methods used to reproduce drawings.  \n• Drawing sizes.  \n• Geometric Tolerancing and Dimensioning and why it is used.  \nEmphasize that a machinist:  \n• Always works to the dimensions, tolerances, and surface finishes specified on a drawing.  \n• Never scales a dimension from a drawing.  \nTechnical Terms  \nReview the terms introduced in the chapter. New terms can be assigned as a quiz, homework, or extra credit. These terms are also listed at the beginning of the chapter.  \nactual size  \nAmerican National Standards Institute (ANSI)  \nbill of materials  \ndual dimensioning  \ngeometric dimensioning and tolerancing revisions  \nscale drawings  \nSI Metric  \nUS Conventional  \nworking drawings  \nReview Questions  \nAssign Test Your Knowledge questions. Copy and distribute Reproducible Master 3-8 or have students use the questions on pages 52–53 in the text and write their answers on a separate sheet of paper.  \nWorkbook Assignment  \nAssign Chapter 3 of the Machining Fundamentals Workbook.  \nResearch and Development  \nDiscuss the following topics in class or allow students to choose topics for individual or group projects.  \n1. Make a tracing and reproduce it using the diazo and electrostatic processes.  \n2. Prepare a display of the microfilming tech-  \nnique of print reproduction. Include prints, samples of film cards and photographs, or magazine advertisements illustrating the equipment used to make them.  \n3. Secure sample prints from industry.  \n4. Secure prints produced by the CAD (Computer-Aided Design) technique.  \n5. Prepare a display panel that shows a simple project from print to","cbCaibDjc1SppHed","https://ap.wps.com/l/cbCaibDjc1SppHed","pdf",761252,14,"English","# Learning Objectives\n## Instructional Materials\n## Guide for Lesson Planning\n## Technical Terms\n## Review Questions\n## Workbook Assignment\n## Research and Development\n## Test Your Knowledge Answers","[{\"question\":\"What skills does the chapter aim to build for reading drawings?\",\"answer\":\"Students learn to read drawings dimensioned in fractional inches, decimal inches, and metric units, and to explain the information found on typical drawings. They also learn the differences among detail, subassembly, and assembly drawings.\"},{\"question\":\"Why do machinists need to understand drawings?\",\"answer\":\"Drawings contain essential information so parts made at different locations will be interchangeable and fit properly in new or earlier assemblies. Machinists may also need drawings when using computer-generated machining programs at the workstation.\"},{\"question\":\"What is emphasized about geometric dimensioning and tolerancing (GD\\u0026T)?\",\"answer\":\"The chapter introduces the basics of geometric dimensioning and tolerancing and explains why they are used. It also highlights that machinists work to specified dimensions, tolerances, and surface finishes and never scale dimensions from drawings.\"}]","Chapter 3 - Understanding Drawings - Learning Objectives | PDF",35]