Question 1

What are the two major shortcomings of implied datums?

Accepted Answer

Implied datums have two major shortcomings. First, they do not clearly communicate which surfaces should contact the inspection equipment, which means the inspector must make an assumption. Second, implied datums do not communicate the sequence in which each surface of the part should contact the inspection equipment.

Question 2

____________________ is two or more surfaces having all elements on one plane.

Accepted Answer

Coplanarity

Question 3

____________________ is a limit to one or more degrees of freedom.

Accepted Answer

Constraint

Question 4

Discuss the composition of a datum system.

Accepted Answer

The datum system is composed of two majo

Question 5

What are the benefits of the datum system?

Accepted Answer

The datum system provides three importan

Question 6

There are two types of datum feature simulators: ____________________ and physical.

Accepted Answer

The answer of There are two types of datum feature...

Question 7

When dimensioning the location of a feature of size on a part, implied datums should be used.

Accepted Answer

A) True 
 B)False

Question 8

Explain the 3-2-1 Rule.

Accepted Answer

The 3-2-1 Rule defines the minimum numbe

Question 9

The datum feature symbol should be specified to be read from the top of a drawing.

Accepted Answer

A) True 
 B)False

Question 10

What dimensions should be measured in a datum reference frame?

Accepted Answer

Only dimensions that are related to a da

Question 11

An implied datum is an assumed plane, axis, or point from which a dimensional measurement is made.

Accepted Answer

A) True 
 B)False

Question 12

Where a datum feature symbol or a datum reference frame symbol is repeated on a drawing, it is not necessary to designate them as reference.

Accepted Answer

A) True 
 B)False

Question 13

The datum system is a set of symbols and rules on how to constrain a part to establish a relationship between the part and ____________________ tolerance zones.

Accepted Answer

The answer of The datum system is a set of...

Question 14

A datum is the origin for dimensional measurements.

Accepted Answer

A) True 
 B)False

Question 15

Whenever a planar surface is used as a primary datum feature, a(n) ____________________ tolerance should be applied to the surface.

Accepted Answer

The answer of Whenever a planar surface is used as...

Exam 13: The Datum System

What are the two major shortcomings of implied datums?

____________________ is two or more surfaces having all elements on one plane.

____________________ is a limit to one or more degrees of freedom.

Discuss the composition of a datum system.

What are the benefits of the datum system?

There are two types of datum feature simulators: ____________________ and physical.

When dimensioning the location of a feature of size on a part, implied datums should be used.

Explain the 3-2-1 Rule.

The datum feature symbol should be specified to be read from the top of a drawing.

What dimensions should be measured in a datum reference frame?

An implied datum is an assumed plane, axis, or point from which a dimensional measurement is made.

Where a datum feature symbol or a datum reference frame symbol is repeated on a drawing, it is not necessary to designate them as reference.

The datum system is a set of symbols and rules on how to constrain a part to establish a relationship between the part and ____________________ tolerance zones.

A datum is the origin for dimensional measurements.

Whenever a planar surface is used as a primary datum feature, a(n) ____________________ tolerance should be applied to the surface.

Drawing Standards

Dimensions, Tolerances, and Notes Used on Drawings

Coordinate Tolerancing and Geometric Dimensioning and Tolerancing GDT

General Dimensioning Symbols

Key GDT Terms

Symbols and Modifiers

GDT Rules

GDT Concepts

Flatness Tolerance

Straightness Tolerance

Circularity Tolerance

Cylindricity Tolerance

Datum Targets

Size Datum Features Rmb

Size Datum Features Mmb

Perpendicularity Tolerance

Parallelism Tolerance

Angularity Tolerance

Position Tolerance - Introduction

Position Tolerance - RFS and MMC

Position Tolerance - Special Applications

Position Tolerance Calculations

Circular and Total Runout Tolerances

Concentricity and Symmetry Tolerances

Profile Tolerance - Basic Concepts

Profile Tolerance Applications

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