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EN1740 Computer Aided Visualization and Design
Spring 2012
EN1740, S2012BCB – Feb. 16, 2012
2/16/2012
Brian C. P. Burke
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Tonight:
• Standards and practices governing engineering drawings
Last Time:
• Measuring within Pro/E
• 2D representation
• Orthographic projection
• 3rd Angle vs. 1st Angle
• Creating engineering drawings
EN1740, S2012BCB – Feb. 16, 2012
• Creating engineering drawings
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Applicable drafting standards
• ASME Y14.5-2009 governs 2D representation of mechanical components
• Standard provides a method of communicating designs efficiently
minimizing confusion
• Standard governs dimensions applied to 2D only
• ASME Y14.41 defines dimensioning in 3D CAD files
EN1740, S2012BCB – Feb. 16, 2012
• ASME Y14.41 defines dimensioning in 3D CAD files
• NO STANDARD CAN BE COMPLETELY DEFINE EVERY TYPE OF
COMPONENT OR SCENARIO
• Understanding standard provides a structure for creating clear, concise
and effective drawings
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Purpose
• 2D drawings provide location and size for the features contained in a
component
• Originally, this was the only tool available to do this
• Components needed to have every feature highlighted
EN1740, S2012BCB – Feb. 16, 2012
• Currently, 2D representations set the stage to highlight critical
dimensions and tolerances
• Drawings accomplish their mission through the use of dimensions,
dimensioning schemes, tolerances, notes, symbols, etc.
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Drawing and Dimensioning Checklist
• Location and Size of all (critical) features
• Extension (Witness), Dimension and Leader lines within standard
• Proper Arrowheads and Character size
• Unidirectional Dimensions
• Scale noted on drawing
EN1740, S2012BCB – Feb. 16, 2012
• Scale noted on drawing
• Conventions for applied units
• Dimensioning scheme expresses Design Intent
• Dimension placement within standard
• Necessary notes have been applied
• Use of language is minimized
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Location and Size
• Most basic function of engineering drawing
• Features must be located and sized in all three dimensions
EN1740, S2012BCB – Feb. 16, 2012
Fig. 3-1, B. A. Wilson, GD&T App. And Intr., 2010
• Some locations are implied (e.g. through holes)
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Pro/E will create dimensions in two ways
Driving vs. Driven dimensionsDriven dimensions are created from Insert menu
EN1740, S2012BCB – Feb. 16, 2012
Driving dimensions are created in part files and shown using the Show/Erase dialog
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Pro/E will create dimensions in two ways
Driving vs. Driven dimensions
Driving Dimensions
• Used to create 3D solid model
• Can be modified in the drawing file to change part geometry
• Can be shown though feature is no longer there! (Be careful)
EN1740, S2012BCB – Feb. 16, 2012
Driven Dimensions
• Essentially “dumb” => only knows drawing references
• It is possible to grab incorrect references and represent incorrect dimensions!
(Be careful)
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Line types
Object, Dimension, Extension and Leader Lines
• Object lines
• Define part geometry
• Medium line weight
• Dimension lines define size
• Extension lines point to feature
EN1740, S2012BCB – Feb. 16, 2012
Fig. 3-2, B. A. Wilson, GD&T App. And Intr., 2010
• Leaders draw focus of notes
• These three are of thin line weight
• Both APPEARANCE and APPLICATION of
these lines can be controlled by Pro/E
• APPEARANCE can be automated
• APPLICATION…not so much. This is up
to the engineer.
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
• Open b-block.prt or
download from
Supporting Materials
EN1740, S2012BCB – Feb. 16, 2012
section of webpage
• Create a new drawing
for this part (File > New >
Drawing, etc.)
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
• Create FRONT, RIGHT
and TOP views
• Show All dimensions for
all views
EN1740, S2012BCB – Feb. 16, 2012
all views
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
EN1740, S2012BCB – Feb. 16, 2012
What’s wrong with this picture?
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
What we need to adjust:
Extension lines
• Separation from part?
• Extension past dimension line?
Dimension lines
Text
• Is the height correct?
Leading/Trailing zeros
• Correct for units?
EN1740, S2012BCB – Feb. 16, 2012
• Spacing?
• Placement?
• Design Intent?
Arrowhead
• Filled?
Let’s pause exercise and review
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Proper extension spacing
• Space from object
• .03in minimum
• .06in recommended
• Space past dimension lines
EN1740, S2012BCB – Feb. 16, 2012
Fig. 3-2, B. A. Wilson, GD&T App. And Intr., 2010
• Space past dimension lines
• Approx. .125in
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Proper dimension spacing
• Space from object
• .4in minimum
• .5in recommended
• Space between
EN1740, S2012BCB – Feb. 16, 2012
• Space between
dimensions
• .24in minimum
• .38in recommended
Fig. 3-3, B. A. Wilson, GD&T App. And Intr., 2010
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Arrowheads
• Should be filled
Text
• All text should now be .125in
Leaders
EN1740, S2012BCB – Feb. 16, 2012
Leaders
• Avoid awkward placements
Units
• For inches no leading zero
• Number of decimals should correspond to
“title-block tolerances” Fig. 3-5, B. A. Wilson, GD&T App. And Intr., 2010
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EXERCISE – Format Extension, Dimension, Leaders and ArrowheadsGeneral Dimension Guidelines (Wilson, 2010;
ASME Y14.5-2009)
• Dimension where feature contour is shown
• Dimension between views
• Dimension off the views (outside object).
Good idea, but beyond the course
• Consider the fabrication processes
and capabilities
EN1740, S2012BCB – Feb. 16, 2012
• Dimension with consideration to Design
Intent
• Create logical arrangement of dimensions
• Stagger dimension values.
• Avoid dimensioning to hidden lines.
Pro/Engineer’s display of dimension
violated all of these
• Consider the inspection processes
and capabilities
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Don’t double dimension.
• Wilson provided an example of
an exception to this rule.
EN1740, S2012BCB – Feb. 16, 2012
an exception to this rule.
• Just say NO!
Fig. 3-31, B. A. Wilson, GD&T App. And Intr., 2010
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Back to work – Start by moving dimensions where they should go.
• Off object
• Between views
EN1740, S2012BCB – Feb. 16, 2012
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EXERCISE – Format Extension, Dimension, Leaders and ArrowheadsA number of dimensions are not referencing feature contour – Not Good
Move these to FRONTVIEW
RMB > Move Item to View >Select Item > Select View
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EXERCISE – Format Extension, Dimension, Leaders and ArrowheadsFRONT view is a very crowded house at this point
• Delete RIGHT view > No benefit
• Create BACK view projected from TOP
EN1740, S2012BCB – Feb. 16, 2012
• Move some dimension from FRONT to BACK view
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EXERCISE – Format Extension, Dimension, Leaders and ArrowheadsTOP view would actually be useful as an X-SEC (review from last time)
• Go to part file
• Create Datum Plane Offset 1.500
offset from TOP datum plane
EN1740, S2012BCB – Feb. 16, 2012
offset from TOP datum plane
• From View Manager Xsec > New >
Name section A > Select New Datum
Plane
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Back to Drawing
• Edit Properties of TOP view
• From Sections Tab > Select A X-Sec
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Show Axes to give
Extension lines something
to grab to
• View > Show and Erase >
EN1740, S2012BCB – Feb. 16, 2012
• View > Show and Erase >
Select Axes Icon > Show All
> Select to Keep > OK
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EXERCISE – Format Extension, Dimension, Leaders and Arrowheads
Clip Witness Lines to
create necessary
clearances
EN1740, S2012BCB – Feb. 16, 2012