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CADD-2 Lesson 2

Advanced Dimensioning & GDT

DIMSCALE Overall dimension scale factor
TEDIT Moves the dimension text of an associative dimension
UPDATE changes to the current dimension variables, text style, precision and units.
OVERRIDE Modifies one or more of the DIMVARS on a one time basis.
DIMVARS Abbreviation for Dimension Variables.
Tolerance Specifies the acceptable variation allowable for a given dimension.
Basic Dimension The target dimension that tolerances are added to to obtain limits
Symmetrical Tolerance Specifies a plus/minus where the upper & lower values are equal
Deviation Tolerance Specifies a plus/minus where the upper & lower values are different values
Limits Tolerancing Only the upper and lower limits of variation are shown, the basic (or target) dimension is not shown
Associative Dimensions Provides for automatic updates of dimensions when modifying an object. (Should always be on)
Dimension Styles A stored set of Dimension Variables
Leader Lines with arrows used to point out particular features in a drawing.
Spline Leader Similar to a regular leader, but may consist of spline curves instead of straight lines.
Alternate Units (Dual Dimensioning) A second set of distances inside of brackets commonly used to show Metric equivalents.
Primary Units Those that appear by default when placing dimensions on a drawing.
GD&T Geometric Dimensioning & Tolerancing
Feature Control Frame Used to display the geometric charecteristic symbols & their corresponding tolerances.
MMC (Maximum Material Condition) specifies that a feature is at it's maximum size or contains the maximum amount of material.
NEWTEXT Allows you to replace the dimension text of an existing dimension, however the dimension will no longer be associative.
Chain Dimensions Dimensions that continue from feature to feature.
Baseline Dimensions Features are measured from a base point or datum.
Unidirectional System of Measurement All dimension text is placed horizontal and read from the bottom of the sheet.
Aligned System of Measurement All text is parallel to the dimension line.
Basic Dimension A dimension to which allowances and tolerances are added to obtain limits. Shown with a rectangle around the text.
Created by: tmurphy