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: Basics of Tolerance 120 Description: This class explains the purpose of tolerances in manufacturing and describes how these tolerances are specified. Includes an Interactive Lab. Difficulty: Beginner Number of Lessons: 12 Language: English, Spanish, Chinese

Class Outline
• Objectives
• The Importance of Measurements
• What Is Tolerance?
• Tolerance and Use
• Tolerance and Cost
• Tolerances for Various Operations
• Types of Tolerance
• Tolerances for a Hole
• Surface Tolerance
• Dimensioning and Tolerance
• Summary

Class Objectives
• Identify common tolerances in a manufacturing environment.
• Define tolerance.
• Identify how tolerance is determined.
• Describe the impact of tolerance on cost.
• Compare tolerances possible in machining operations.
• Describe methods of describing tolerance.
• Identify advantages of different tolerance methods.
• Identify elements of tolerance for holes.
• Describe elements of surface tolerance.
• Identify the relationship between dimensions and tolerance.

Class Vocabulary

Vocabulary TermDefinition
A tool consisting of hardened grains that is used to machine, grind, or finish a workpiece.
The exactness of a measurement produced compared to the desired result.
The intentional space left between a hole and the shaft inserted into it.
A tolerance method using an equal plus and minus deviation from the specified dimension.
A document containing all the instructions necessary to manufacture a part. The key sections of a blueprint are the drawing, dimensions, and notes.
The process of pouring a liquid material into a mold until it cools into a solid form.
The difference between the largest permissible shaft and the smallest permissible hole.
The process of determining the desired measurement of a feature on a part.
The process of using a multi-point tool to penetrate the surface of a workpiece and make a round hole.
An unintentional surface irregularity that may be random or repeating, such as cracks or inclusions.
The use of an abrasive to wear away at the surface of a workpiece to achieve highly accurate measurements.
A tight fit designed where the smallest permissible shaft is larger than the largest permissible hole.
An abrasive process that removes the last bit of unwanted material within a very tight tolerance.
The overall direction of the pattern created by the production process.
A tolerancing method using an absolute maximum and minimum allowable dimension.
The process of removing metal by producing chips through the use of cutting tools.
The use of a machine to remove metal from the surface of a workpiece with a rotating multi-point tool.
The ability of a process to repeat the same accurate measurement over time.
The inherent, fine, closely-spaced irregularities created by the production process.
The allowable deviation in surface texture.
The unwanted but acceptable deviation from a desired dimension. The tighter the tolerance, the greater the cost to manufacture the part.
The expected range of measurements produced by a given operation.
The machining process used to make cylindrical parts. Turning is commonly performed with a lathe.
A tolerancing method using a deviation in only one direction, either plus or minus, from the specified dimension.
The repeating irregularities with spacing greater than roughness marks that result from machine deflections and vibration.