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