Chapter 10: Dimensioning & Tolerancing

Range of leader line thickness

.12 -.24 inches (3-6 mm)

Center dashes are generally ____ in thickness.

.12 inches

Dimension text is normally ___ high, centered in the space provided in the dimension line.

.12 inches (3 mm)

According to ASME standards, what is the minimum recommended spacing between the first dimension line and subsequent dimension lines?

.250"

Dimensions should have at least ____ amount of space between them.

.375 inches or 10 mm

According to ASME standards, what is the minimum recommended spacing between an object feature and the first dimension line?

.375"

Drafter usually prefer a distance of ___ and a spacing of___.

.5-1.0 inches, .5-.7 inches

Centerline space is_____.

.6 inches

Extension lines start with a small offset of ____ from the object and extend ____ past the last dimension line.

.6 inches (1.5 mm), .12 inches (3 mm)

Leader lines can be drawn at any angle between_____.

15 and 75 degrees.

Stock Size

A commercial or pre-manufactured size, such as a particular size of square, round, or hex steel bar.

Unidirectional dimension

A dimension in which all numbers are placed horizontally.

Aligned dimension

A dimension in which the numbers line up with the dimension line.

Tolerance

A dimension is the total permissible variation in size or location.

Child

A dimension style override.

Associative dimension

A dimension that updates when the dimensioned object is changed.

Nominal Size

A dimension used for general identification such as stock size and thread diameter.

Location dimension

A dimension used to show the position of a feature on an object.

Dimension

A numerical value(s) or mathematical expression provided in appropriate units of measure and used to define form, size, orientation, or location of a feature or part.

Fair Curve

A smooth curve without sharp changes in any direction over any portion of its length.

Controlled Radius (CR)

A term applied when the limits of the radius tolerance zone must be tangent to the adjacent surfaces.

Basic Dimension

A theoretically exact size, location, profile, or orientation of a feature or point.

How are polygons dimensioned?

Across the flats in the view where the true shape is shown.

_____dimensioning is commonly used in arch and structural drafting.

Aligned

Bilateral Tolerance

Allowed to vary in two directions from the specified dimension.

Chamfers of 45 degrees are dimensioned with a note, while other chamfers require what?

Angle and size or two size dimensions

Coordinate dimensioning

Angles dimensioned by locating the corner of the angle.

Angular dimensioning

Angles dimensioned with one dimension and the value of the angle in degrees.

Actual Local Size

Any cross-sectional measurement at any two adjacent points.

Direct Dimensioning

Applied to control the size or location of one or more specification.

Baseline dimensioning

AutoCAD term for dimensioning to a common surface, centerline, or center plane.

Continued dimensioning

AutoCAD term for placing a line of dimensions from one feature to the next.

Six Stigma

Business management strategy that seeks to improve the quality of process outputs by identifying and removing the causes of defects and minimizing manufacturing variables by using quality management methods.

Knurling

Cold forming process used to form a cylindrical on a surface uniformly with a diamond or straight pattern creating a knurl.

Clearance Fit

Condition when, because of the limits of dimensions, there is always a clearance between mating parts.

Local/Specific Notes

Connected to specific features on the views of the drawing.

Which command allows you to dimension the vertical distance between the endpoints of a slanted line?

DIMLINEAR

To dimension a drawing using rectangular coordinate dimensioning without dimension lines, use the ____ command.

DIMORDINATE

Chain/Point to Point Dimensioning

Dimensioning from one feature to the next.

Tolerance Stacking (Buildup)

Dimensioning tolerance of each dimension builds on the next.

There cannot be an infinite number of actual local size values. True or false?

False

Extreme Form Variation

Form with the feature between the upper limit and lower limit of a size dimension.

_____ are used on arch, structural, and other construction-related drawings.

Fractions

Unilateral Tolerance

Has a variation in only one direction from the specified dimension.

Notes

Identifies the size of a feature(s) with written specifications that are more detailed than a numerical value.

Locational Fits

Intended to determine only the location of the mating part.

Zero suppression settings for a metric dimension

Leading options off and Trailing options on.

REVCLOUD

Mark up a drawing for design changes.

Size Dimensions

Placed directly on a feature to identify a specific size or they may be connected to a feature in the form of a note.

General Notes

Placed separate from the views and relate to the entire drawing.

Location Dimensions

Provide the relationship of feature of an object.

Spherical Radius (SR)

Radius of a sphere.

Tabular Dimensioning

Size and location dimensions from datums or coordinates (X, Y, Z) axes are given in a table identifying features on a drawing.

Flagnote

Specific note placed with general notes and keyed to the drawing with a delta symbol.

Statistical Tolerancing

The assigning of tolerance to related dimensions in an assembly based on the requirements of statistical process control.

Geometric Tolerance

The category of tolerances sued to control size, form, profile, orientation, location, and runout.

Least Material Condition (LMC)

The condition in which a feature contains the least amount of material allowed by the size limits.

Maximum Material Condition

The condition of a part or feature when it contains the most amount of material within the stated limits.

Interference Fit

The condition that exists when, because of the limits of the dimensions, mating parts must be pressed together.

Knurl Pitch/Diametrical Pitch

The distance form the crest of one knurl form to the crest on the next knurl form.

Limit Dimensioning

The extreme values of the tolerance are given in the dimensional and it is an alternative method of showing and calculating tolerance.

Feature

The general term applied to describe a physical portion of a part of object, such as a surface, slot, tab, pin, keyseat, or hole.

Surface Finish/ Texture

The intended condition of the material surface after the machining processes have been completed.

Least Material Condition

The least amount of material possible in the size of a feature within the stated limits.

Specified Dimension

The part of the dimension from which the limits are calculated.

Maximum Material Condition (MMC)

The situation in which an external feature and the smallest limit for an internal feature.

Allowance

Tightest possible fit between two mating points.

What are countersinks used for?

To recess the head of a fasteners below the surface of the part.

The first dimension line is normally spaced farther from the object. True or false?

True

Direct dimensioning

Type of dimensioning applied to control the specific size or location of a feature.

Reference Dimension

Used for information purposes only and is usually without tolerance and are enclosed in ().

Spot Face

Used to provide a flat bearing surface for a washer face or bolt head.

TRUER note

Used to specify the actual radius when an arc lies on an inclined plane and the true representation is not shown.

Chart Drawing

Used when a particular part or assembly has one or more dimensions that change depending on the specific application.

Plus-Minus Dimensioning

Uses a bilateral or unilateral tolerance format depending on the application.

___does not precede a decimal inch that is less than one.

Zero

The term,_____ , refers to any text on a drawing (such as a note or dimension).

annotation

Holes are dimensioned in the view in which they appear as ____.

circles

The theoretically perfect surface, plane, point, or axis from which all measurements are taken in ordinate dimensioning is called a___.

datum

Plus & Minus values of an inch tolerance have the same number of ___.

decimal places

Circles are generally dimensioned by giving the ____.

diameter

For aligned dimensioning, the fraction bars are ___ for dimensions that read from the bottom of the sheet and ____ for dimensions that read from the right.

horizontal, vertical

When dimensioning always place the ___ dimensions closest to the object and progressively larger dimensions outward from the object.

smallest

When dimensioning conical shapes, do so when possible in the view where the cone appears as a ____.

triangle

All dimensional values are displayed horizontally and read from the bottom of the sheet in ____ dimensioning.

unidirectional