Blueprint Reading for Machine Tool OperatorsDRF 124
Prerequisite: DRF 120. Instructs machinists, lathe operators, mill operators, and grinder operators in more in-depth treatment of working drawings, supplementary views and information, materials and processes commonly found in machining drawings. (30-0)
Outcomes and Objectives
Interpret dimensional tolerances.
- Explains the purpose of tolerance dimension
- Describes the techniques of displaying tolerance dimension
- Recognizes standard tolerance blocks
Interpret common surface finish notations.
- Interprets the following surface finish conditions: waviness, roughness height, lay, and roughness width cutoff
Recognize standard blueprint machining terms.
- Correctly interprets the following terms: fillet, runout, reaming, counterbore, countersink, spotface, chanfer
Interpret gear drawings.
- Explains the basic gear theory
- Explains the meaning of the common gear terms used on industrial prints
- Describes how to calculate additional gear data from handbook tables
Interpret the properties of ferrous, non-ferrous and plastics.
- Names the basic types of materials used in industry
- Describes the difference between iron and steels
- Lists the different types of steels
- Explains the importance of carbon content in steels
- Explains the steel classification numbering system
- Lists the common types of non-ferrous metals
- Lists the common types of plastics
Correctly interpret the symbols of geometric dimensioning.
- Explains why geometric dimensioning is needed
- Defines the common geometric dimensioning terms
- Lists the basic rules of geometric dimensioning
- Describes how feature control frames (symbols) are displayed on industrial prints
Interpret the basics of numerical control and interpret NC blueprints.
- Describes the ordinate and tabular dimensioning systems
- Discusses the difference between fixed zero and floating zero numerical control systems
- Describes the relationship between numerical control (NC) and computer numerical control (CNC)
Demonstrate competency in the basics of computer-aided drafting.
- Explains the advantages of using CAD in the drafting field
- Discusses the functions of CAD hardware
- Distinguishes the difference between a hand-drawn print and a CAD-developed print
The student will interpret metric dimensioned, and dual-dimensioned blueprints.
- Evaluates the linear measuring system
- Discusses reasons for using the metric measuring system
- Describes the dual dimensioning system used on industrial prints
- Explains product liability notations that may appear on prints