Chapter 2 Dimensioning and Tolerancing Symbology 23
Copyright Goodheart-Willcox Co., Inc.
Chapter 2
Dimensioning and Dimensioning and
Tolerancing Symbology Tolerancing Symbology
Objectives
Information in this chapter will enable you to:
▼
Identify and draw general dimensioning
symbols and show their general applications.
▼
Identify and draw tolerancing symbols and
show their general applications.
▼
Complete a feature control frame using the
correct order of segments in the frame.
▼
Identify basic dimensions and defi ne means
for indicating a basic dimension on a drawing
or in a design model.
Technical Terms
all around symbol
all over symbol
angularity symbol
arc length symbol
basic dimension
circular runout symbol
circularity symbol
concentricity symbol
continuous feature (CF) symbol
controlled radius symbol
counterbore symbol
countersink symbol
cylindricity symbol
datum feature symbol
datum feature triangle
datum features
datum reference frame
datum target areas
datum target lines
datum target points
datum target symbol
depth symbol
diameter symbol
feature control frame
fl atness symbol
free state symbol
independency symbol
irregular features of size
least material boundary (LMB)
location tolerances
maximum material boundary (MMB)
modifi ers
movable datum target
origin symbol
parallelism symbol
perpendicularity symbol
position tolerance symbol
profi le of a line symbol
profi le of a surface symbol
projected tolerance zone symbol
radius symbol
regardless of material boundary (RMB)
regular features of size
slope symbol
spherical diameter symbol
spherical radius symbol
spotface symbol
square symbol
statistical tolerance symbol
straightness symbol
symmetry symbol
tangent plane symbol
taper symbol
total runout symbol
translation symbol
unequally disposed tolerance symbol
unilateral zone