Lecture 17 - Top Down Design
Transcript of Lecture 17 - Top Down Design
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EN1740 Computer Aided Visualization and Design
Spring 2012
EN1740, S2012BCB – Mar. 22, 2012
3/22/2012
Brian C. P. Burke
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Tonight:
• Finish Top-Down Design
• Renderings
• Form Project Groups
Last Time:
• Additional Top-Down Design
EN1740, S2012BCB – Mar. 22, 2012
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AutoCAD Next Up?
• We’re going to tackle an introduction to AutoCAD in the next few lectures
• Please go to Autodesk’s educational community site and register
• www.Autodesk.com/edcommunity
• Once registered you’ll be able to download AutoCAD 2012
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• Please do so in anticipation of the lectures to come
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EXERCISE – Top-Down Design Tools
• Extrude a solid feature from the
BASE_PLN to the bottom of the part
• Sketch on the BASE_PLN
• The USE EDGE tool will give
the inside curve
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the inside curve
• OFFSET EDGE (.060) for
outside edge of feature
• Select ‘Extrude to Selected…’
and select the CAP_PLANE
surface
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EXERCISE – Top-Down Design Tools
• Basically repeat steps down
for CAP
• Copy BASE_PLN
• Extrude solid feature
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from it
• This time:
• Cut from the solid
• Offset .065
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EXERCISE – Top-Down Design Tools
• Extrude a partition between
where the coffee will be
ground and where the
electronics will live
• Web thickness is
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• Web thickness is
.100in
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EXERCISE – Top-Down Design Tools
• Back to the assembly,
insert the WHEEL
component
• How much coffee can we
fit in the space allotted for
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fit in the space allotted for
grinding?
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EXERCISE – Top-Down Design ToolsCreate a new model to measure the coffee volume
• File > New > coff_vol.prt
• Copy outer surface from ID
model
• Copy BASE_PLN from
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skeleton
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• Solidify
• Add R.250 round to top
• Trim solid at BASE_PLN
EXERCISE – Top-Down Design ToolsCreate a new model to measure the coffee volume
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• Assemble coffee
volume part into top level
assembly
EXERCISE – Top-Down Design ToolsCreate a new model to measure the coffee volume
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EXERCISE – Top-Down Design ToolsUse Component Operations to determine volume
• Edit > Component
Operations
• Cut Out
• Select volume model > OK
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• Select volume model > OK
• Select cap part > OK
• Done
• Done/Return
• Repeat with Housing and
Wheel
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EXERCISE – Top-Down Design ToolsUse Component Operations to determine volume
• Go back to volume model
• Analysis > Model > Mass
Properties
• Click the goggles
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• Click the goggles
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EXERCISE – Top-Down Design ToolsFast forward…..built the model and customer feedback is in
• As a result of focus group study we have to change the model:
• Ellipse cross section isn’t “ellipsey” enough
• Not enough volume of coffee in grinder
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• Straight curve interface has been done, need a new look
• Back to ID model
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EXERCISE – Top-Down Design Tools
• Edit ellipse on base feature
• Modify Rx to 2.25
• Modify spine feature
• Should extend 2.47
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• Should extend 2.47
from RIGHT
• Regen
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EXERCISE – Top-Down Design Tools
• Replace straight sketch with
circular section
•16.00 dia; center 3.00
down and 1.25 to the left
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EXERCISE – Top-Down Design ToolsID model is updated
• Move on to the parts
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EXERCISE – Top-Down Design ToolsPart update
• Regenerate the Cap
• Failure mode
• Clip suppress
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EXERCISE – Top-Down Design ToolsPart update
• Go into ID model and copy
redefined curve
• Need to update some
references
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• It’s faster to go through
Failure Mode than start
over!!
• Here we are
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EXERCISE – Top-Down Design ToolsPart update
• Same steps with the
Housing
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EXERCISE – Top-Down Design ToolsAssembly update
• May need to redefine
a few things here and
there, but the volume
number comes back
out.
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out.
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EXERCISE – Top-Down Design Tools
Summary – Where did we use Top-Down tools
• Skeletons
• Provide a layout for entire product and position of primary systems
• Shared Geometry
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• Allows for single-source, product-level geometry specification
• Component Operations
• Use product components to garner other information
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RenderingPhoto Quality Images of CAD models
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http://www.ptc.com/product/creo/advanced-rendering- extension
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EXERCISE – RenderingBlank Surface and Curve Layers
• Click Show above
model tree and select
‘Layer Tree’
• Highlight the ‘All
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Curves’ and ‘All
Surfaces’ Layers
• RMB > Hide
• RMB > Save Status
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EXERCISE – RenderingRender Controls
• One-stop shop for all
things related to
rendering
• View > Model Setup >
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Render Control
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EXERCISE – RenderingOrientation
• Save an orientation
so the model can be
put back in the same
place for updates
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• Use Dynamic
Orientation
• Remember to Save
with a name you’ll
remember
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EXERCISE – RenderingSet Colors and Transparency
• View > Color and
Appearance (or from
tool bar)
• From the drop down,
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select Components
• Select Component
• Select Component
and click Apply
• See Advanced tab for
transparency
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EXERCISE – RenderingRoom Editor
• Set the stage – create
a scene for the model
• Using the Position,
Rotate and Display
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tabs orient the model to
the space
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EXERCISE – RenderingRoom Editor
• Uncheck everything but
the Floor and Wall 2
• Apply textures and
render
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