## Shop Essentials (Applied Mathematics) Training

Class Information
 Tooling U-SME classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
 Class Name: Interpreting Blueprints 230 Description: This class provides an overview of common features found in prints and describes how to properly inspect them. Includes an Interactive Lab. Difficulty: Intermediate Number of Lessons: 16 Language: English, Spanish, Chinese

Class Outline
• Objectives
• The Importance of Reading Prints
• The Sample Print
• Common Shop Terminology
• Angles, Chamfers, and Tapers
• Sample Print: Angled Features
• Common Hole Features
• Sample Print: Hole Dimensions
• Surface Finish
• Sample Print: Surface Finish
• Summary

Class Objectives
• Describe the relationship between prints and inspection.
• Identify information in a print relating to a section view.
• Identify shop terminology that commonly appears in prints.
• Identify information in a print that specifies angled features.
• Describe proper methods for checking an angled feature on a part.
• Identify common types of hole features.
• Describe proper methods for checking a hole on a part.
• Identify information in a print that specifies a feature with a radius.
• Describe proper methods for checking a corner radius on a part.
• Describe how surface finish is specified in a common print.
• Describe proper methods for checking surface finish on a part.
• Identify common methods for specifying a thread in a print.
• Describe a thread based on its standard specification.
• Describe proper methods for checking an OD thread on a part.

Class Vocabulary

Vocabulary TermDefinition
A curved feature representing a portion of a circle.
A view drawn at a right angle to an angled feature of the part. Auxiliary views show the true size of an angled surface.
A hole that is closed at its bottom.
A document containing all the instructions necessary to manufacture and inspect a part. The key sections of a blueprint are the drawing, dimensions, and notes.
A number of holes with centers that are positioned around the circumference of an imaginary circle.
A hole inspection gage that makes three points of contact within the hole. Bore gages are handheld, variable instruments that provide very accurate readings of hole sizes.
A raised, circular peg or protrusion. A boss often has a hole in the center and is used to improve assembly.
A rough, sharp edge remaining on a part after machining or stamping. Burrs pose an injury risk and interfere with the fitting of parts.
A part formed by pouring molten metal into a mold until it cools and solidifies into its final shape. Castings tend to have rougher surface textures.
For circles and arcs, it is the point that is equally distant from all other points located on the circle's circumference or the arc.
A line used to define the center of a hole, a cylindrical part, or symmetrical part. Center lines consist of alternating long and short dashes.
A small, angled surface added on the end of a shaft, around the opening of a hole, or along an edge. A chamfer removes the sharp edge and helps remove burrs.
A rounded internal corner located where two features meet on either a flat or cylindrical part.
A larger diameter added at a hole opening, with a flat surface between the two diameters. A counterbore provides a space for the head of a bolt or other type of fastener.
An enlarged, angled surface added to a hole opening. A countersink differs from a counterbore because it leaves a tapered opening.
The removal of burrs on a part by processes such as grinding or filing.
A common unit of measurement used to indicate the size of an angle.
The distance from one edge of a circle to the opposite edge that passes through the center. Round or cylindrical features require diameter measurements.
A rounded internal corner. A fillet adds strength to the corner and is often easier to machine.
A gage on or in which a good part should fit easily.
A line used to define a part feature that is not visible in a specific view. Hidden lines consist of a series of short dashes.
A thread located on the interior surface of a cylindrical hole.
A patterned series of grooves or diamond-shaped marks formed into the part surface. A knurl is added to provide a surface for gripping.
The process of removing metal to form or finish a part, either with traditional methods like turning, drilling, milling, and grinding, or with less traditional methods that use electricity, heat, or chemical reaction.
One-millionth (.000001) of the U.S. standard inch. Surface roughness is typically measured in microinches.
A groove or smaller-diameter section between two larger diameters on a cylindrical part. A neck allows a flush or tight fit between the largest diameter and another part.
A gage on or in which a good part should not fit.
The rounded tip on the cutting edge of a single-point tool. The nose radius on a tool leaves a matching corner radius on a part.
A thread located on the exterior surface of a cylindrical part or feature.
An inspection instrument that projects a magnified shadow of a part feature onto a screen for measurement.
A blueprint method of specifying a thread by attempting to represent the actual two-dimensional appearance of the thread.
A hardened, cylindrical gage used to inspect the size of a hole. Pin gages are available in standard diameters.
An enclosed recess, often in a rectangular part. Most pockets are square or rectangular with rounded corners.
An inspection device that uses a stylus to trace along the surface of a part and determine its average roughness.
The distance from the center to the edge of a circle or arc. The size of a radius determines the size of the circle or arc.
A handheld gage with an accurate, rounded corner used to inspect the size of a corner radius on a part. Radius gages are available in a set that offers a range of sizes.
The inherent, fine, closely spaced irregularities remaining on a part surface after manufacturing.
A blueprint method of specifying a thread by showing a series of parallel lines.
A line used to identify the imaginary cut portion of a part in a section view. Section lines appear as a series of diagonal lines drawn close together.
A view illustrating a rotated section resulting from an imaginary cut in the part. Blueprints may contain a variety of different section views.
A blueprint method of specifying a thread by including pairs of solid and dashed lines drawn parallel to the thread. The simplified method is the most common method for specifying a thread.
A shallow, larger diameter added at the top of a hole. A spotface is most often used on castings to provide a flat surface for assembly.
A small, cone-shaped spherical point made of diamond that contacts the part and measures surface roughness.
The degree of smoothness of a part's surface after it has been manufactured. Surface finish is the result of the surface roughness, waviness, and flaws remaining on the part.
For a cylindrical part, it is a gradual decrease in diameter from one end to another. For a flat or rectangular part, it is an angled surface that gradually changes from a larger height to a smaller height at a constant slope or incline.
A raised, helical rib or ridge around the interior or exterior of a cylindrically shaped object. Threads are found on screws, nuts, and bolts and are used to fit parts or provide motion.
A number and letter combination that indicates the degree of fit for a thread.