Geometric Dimensioning and Tolerancing Chapter 2, Symbols and Abbreviations.
Chapter 8/9 Dimensioning/Tolerancing. Agenda Chapter 8: Dimensioning – Terminology and Conventions...
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Transcript of Chapter 8/9 Dimensioning/Tolerancing. Agenda Chapter 8: Dimensioning – Terminology and Conventions...
![Page 1: Chapter 8/9 Dimensioning/Tolerancing. Agenda Chapter 8: Dimensioning – Terminology and Conventions – Linear Dimensions – Dimension Styles, Scale, Units.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfb61a28abf838c9e0ba/html5/thumbnails/1.jpg)
Chapter 8/9Dimensioning/Tolerancing
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Agenda
• Chapter 8: Dimensioning– Terminology and Conventions– Linear Dimensions– Dimension Styles, Scale, Units– Aligned– Radius and Diameter– Angular– Ordinate, Continue, Quick Leader– Holes– Applications to Sectional and Orthographic views
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Linear Dimensioning Methods
1. Select linear dimension, start, end, move, click
2. For vertical same, except may need type V3. Select linear dimension, R-click, select object
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Change Text
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Change Text in Dimension (fig 8-7)
• Start Dimension, after selecting 2nd extension line, type t, then 5 x 1.5 (7.50) <enter>
• You may also type m for Mtext and use dialogue
• To edit an existing dimension, use dimension text edit tool – change style or justification
• To edit dimension text, choose the A dimension symbol
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Dimension Styles
• We’ve used this to change center marks to lines
• Also can change the scale of measurements for drawings not-to-scale– Primary units tab– Dimensions must always reflect true size– Does the preview reflect change in scale?
• Also can change text size & placement– Text tab, modify height, alignment, placement
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Different Format Requirements for Millimeter and Inches drawings
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Units
• All dimension values are given default tolerances formanufacturing, for example:
• Therefore a dimension of 5.50 means less tolerance than 5.5000– Again, go to Dimension Styles>Primary Units– Experiment with leading zero suppression
(needed for inches drawings)– Experiment with precision, and format
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Aligned Dimensions• Can be by selecting extension lines
• and by selecting object– Hit return after starting, select line, and location– You may type M, T for text options, A for angle of text
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Radius and Diameters
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Radius and Diameters• Rule: arcs use radius, circles use diameter
– Any arc > 180 degrees use diameter
• Radius: select arc, position dimension – leader line is neither horizontal nor vertical– Modify text by typing M, type “– 4 Places”– Can remove center pt mark: syms&arrows/none
• Circles: need diameter value + center pt info– Change center pt to center line– Tweak the scale factor so line crosses edge – Add horizontal and vertical dimensions to circle– Then add diameter dimension…angle leader line
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Do NOT over-dimension
Angle Dimension
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Angle Dimension • Rule: arcs use radius, circles use diameter
– Any arc > 180 degrees use diameter
• Radius: select arc, position dimension – leader line is neither horizontal nor vertical– Modify text by typing M, type “– 4 Places”– Can remove center pt mark: syms&arrows/none
• Circles: need diameter value + center pt info– Change center pt to center line– Tweak the scale factor so line crosses edge – Add horizontal and vertical dimensions to circle– Then add diameter dimension…angle leader line
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ORDINATE DIMENSIONS
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ORDINATE DIMENSIONS
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Ordinate Dimensions
• Based on X-Y coordinate system.• No extensions, arrows, etc• Useful when there are lots of circles
– to place center points
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Ordinate Dimensions
• First, relocate the origin– Tools>New UCS>Origin
• Click on lower left corner
• Turn on ORTHO button• Select Ordinate Dimension Tool
– Select lower endpoint of circle centerline– Select point on X-axis directly below centerline– Right-click to repeat on other features– Extend centerlines as needed – Add diameter dimension for holes
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BASELINE DIMENSIONS
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Baseline Dimensions
• Used to show a series of dimensions originating from a baseline – Eliminate tolerance buildup associated with chain
type dimensions– Only use after an initial dimension drawn
• Linear Dimension first (nearest object)• Select baseline tool
– Continue to select extension lines for remaining objects
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CONTINUE DIMENSIONS
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Continue Dimension
• Chain dimensions based on initial linear/angular/ordinate dimension
• Place first linear dimension• Choose Continue dimension• Continue placing new dimensions along edge
of object
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QUICK DIMENSION TOOL
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Quick Dimension
• Inserts many dimensions at once• Lets you select a number of extension lines,
– Then c for continue OR o for ordinate
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QUICK LEADER TOOL
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Quick Leader
• Leader—slanted lines that extend from notes or dimensions to a specific feature on the drawing
• Usually end with an arrowhead or dot• Same as Radius and Diameter but used when no
circle present• Click Leader tool
– start point (arrowhead), end point (of slant)– End point (of horizontal line) <enter-2x> then text– Curved line possible if type s after clicking on tool
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HOW TO DIMENSION HOLES
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HOLES IN SECTION VIEWS
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HOLE PATTERNS
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FILLETS AND ROUNDSAre usually the same size…can use a note:
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PLACEMENT OF DIMENSIONS
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PLACEMENT OF DIMENSIONS
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PLACEMENT OF DIMENSIONS
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PLACEMENT OF DIMENSIONS
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SECTIONAL VIEWSmay need to adjust section angle
for dimension line visibility
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ORTHOGRAPHIC VIEWSDo not double-dimension
30
This would doubly define the 30 !!
Holes dimension in circle view
GOAL—Minimum Dimensions needed to completely define all features
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Agenda
• Chapter 9—Tolerancing– Direct tolerance– Tolerances in Inches and Millimeters– Plus and minus tolerances– Limit tolerances– Angular Tolerances– Chain vs Baseline Dimensioning : effect on tolerance
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MILLIMETER STYLE
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INCHES STYLE
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ACCEPTABLE OBJECTS,Millimeters
+/- Tolerances
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ACCEPTABLE OBJECTS,INCHES STYLE
+/- Tolerances
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AutoCAD Plus/Minus Tolerances1. Text option
– Linear dim, t, type text “5.00%%p.02” for +/-
2. Mtext option– Linear dim, m, click to right of value, %%p, etc.– dimension style/primary units to set precision
3. Using Dtext– Type dtext, place start, define ht/angle, type dim
• 5.00%%p.02, then enter
4. Dimension Styles – sets for all future dim’s– Modify/tolerances/ method/symm, value
– (or deviation, 2 values)
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LIMIT TolerancesSame meaning, easier to read
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LIMIT Tolerances with dimension style toolbar
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LIMIT Tolerances with dimension style toolbar
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LIMIT Tolerances with dimension edit toolbar(When only a few need limit dimensions)
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ANGULAR Tolerances with dimension style toolbar
Same as for linear, use Mtext or text option
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CAUTION!!! Double Dimensions
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CHAIN vs BASELINE and tolerances
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