(Tutorial 2 – Mouse)
Surface-modeling
Solid-modeling
Assembly Design
Design with a Master Model
Design in Context
- Build the upper surfaces of the mouse Tutorial 2B
- Do the draft analysis to search any undercut portion on the upper surfaces - Build the lower surfaces of the mouse
- Convert the surfaces into a solid (Master Model) Tutorial 2C
- Build the parting surfaces based on the imported drawing - Create components from the finished model
- Create a new part in the assembly (Design in Context)
- Modify a part design while looking at other parts (Design in Context)
Please be reminded that this series of tutorials is designed to demonstrate a design approach with Siemens NX, rather than the command itself. For the details of commands, please read the online help or attend the software training.
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C:\projects\mouse) and copy the
drawing file (mouse_outline_b.dxf) into the folder
• Enter Siemens NX 6 by double-clicking its icon on the desktop
• Select “Roles Essential with full Menus”, then click ok
• File/New
• Select Model as Type
• Enter “master_model_a.prt” as file name
• Select the path of the project folder • Click ok
coordinates system
• Select “Absolute CSYS” as type • Click ok
To Import the outline drawing:-• File/Import/DXF
• Select the file “mouse_outline_b.dxf” • Select “WORK” as “Import to Part” • Click ok
(the imported curves will be pasted on the XY plane)
• Double-click on the scale line of the drawing • Check if the displayed length is 50mm; if not, we
need to enlarge or shrink the drawing into the correct size
• Delete the scale line ( we don’t need it anymore)
To Reposition the 3 views (offset from absolute datum by
150mm):-• Edit/Move Objects…
• Select all the curves of Top View • Select “Move Handle Only”
• Drag the handle to the midpoint of the arc • Deselect “move handle only”
• Select “Move Original” • Enter x =0. y=0, z=150
• then rotate about z by 90deg (clockwise) • Click “Apply”
Handle (free to move)
• Select “Move Handles Only”
• Draft the handle to the midpoint of the line • Deselect “move handles only”
• Enter x =0, y= -150, z=0
• Then rotate about x by 90deg (as shown ) • Click apply
• Select all curves of Right View
• Select “Move Handles Only”
• Draft the handle to the endpoint of the line
• Deselect “move handles only” • Enter x =150, y= 2.85, z=0
• Then rotate about x by 90deg (as shown ) • Rotate about z by 90deg (as shown )
• Click ok to complete Result
Top
View Right View
Front View
• Select all curves
• Right-click on a curve, select “edit display” • Select “Yellow” as Color
• Click ok
To Move all curves to a layer99:-• Select all curves
• Select “Format/ Move to Layer…” • Enter 99
• Click ok
To make all layers Invisible, except layer 1,
61&99:-• Format/Layer Settings…
• UnTick all layers, except 1, 61, & 99 • Select “visible only” for layer99 • Click close
• Insert Datum/Datum plane • Select xy plane
• Distance 50mm • Click ok
• Insert/Sketch…
• Select the offset plane • Click ok
• Draw a point as shown
• Mirror the point around y axis
• Draw a 3-point arc (start & end at the existing points, middle at the origin)
• Drag the endpoint to make it longer • (the arc should match the reference) • Click icon “Finish Sketch”
Draw a point here
• Select xz plane • Reverse Direction
• Distance 50mm • Click ok
• Insert/Sketch…
• Select the offset plane • Click ok
• Draw a point as shown
• Mirror the point around z axis
• Draw a 3-point arc (start & end at the existing points, middle on the yellow arc)
• Drag on the curve to adjust radius
• Drag an endpoint to make it longer • Click icon “Finish Sketch”
drag drag
To build a 3d curve by combined projection :-• Insert/ Curve from Curves/ Combined
Projection
• Select sketch.0 as curve.1 • Select sketch.1 as curve.2
• (projection direction = normal to curve) • Click ok
• Hide Sketch.0 & Sketch.1 (right-click, select “hide”)
• Hide Plane1 & Plane2
(This combined curve can fit the shapes of both top view and front view)
Sketch.0
• Select yz plane • Switch to Top View
• Drag the plane onto the plane (we can drag the green ball to make the plane bigger) • (offset value = 30.5)
• Click ok
• Insert/Sketch
• Select the offset plane, click ok
• Draw two arcs (tangent to each other) • Click icon “Constraints”
• Select the end point and the absolute y axis • Select “point on curve” (the endpoint is now
on y-axis)
• Adjust the shape & position of the arcs so that they can match the yellow reference
• Click icon “finish sketch”
To Create an extruded surface:-• Insert/Design Feature/Extrude…
• Select the combined curve as Section • Select +Z as the direction
• Enter 20 mm as distance • Click ok
To Create a Draft 5 deg (from parting line):-• Insert/Detail Feature/Draft
• Select “From Edges” as type • Select +Z as Draw Direction • Select the lower edge
• Enter 5 deg as Angle 1 • Click ok
To Create an extruded surface with Draft:-• Insert/Design Feature/Extrude
• Select “Sketch.2” as Section • Select +Z as the direction • Enter 20 mm as distance
• Select “From Start Limit” as Draft • Enter 5 deg as Angle
• Click ok
To Mirror a
surface:-• Insert/Associative Copy/Mirror Body • Select this surface as body
• Select yz plane as mirror plane • Click ok
• Insert/Detailed Feature/Face Blend • Select surface as Chain1
• Select surface as Chain2
• (Both arrows should point inward; if not, reverse it)
• Enter 5mm as Radius
• Select “Trim to all input faces” • Click ok
• Repeat the above steps for the opposite side
• Hide Datum.3
• Insert/Sketch
• Select XZ plane, click ok
• Insert/ Curve from Curves/Offset from curve
• Select the combined curve • 3.5 mm as offset value • Click ok
• (We can create an offset curve from any entity that is out of the sketch.)
• Insert/Sketch
• Select yz plane
• Draw two arcs as shown (tangent to each other)
• Draw a horizontal line starting from the connecting point , then make either one tangent to it; Convert the line to a reference line
• Create an intersection point on the offset curve (Insert/Curve-from-curves/intersection point)
• Make a “Point on curve” constraint
• Adjust the shape & position of the arcs so that they can match the yellow reference (just drag
on curves or points) • Click icon “finish sketch”
Offset curve
Horizontal line(reference)
Coincided with y axis
• Select XZ plane • Select the endpoint • Select “Associative” • Click ok
• Insert/Sketch
• Select the offset plane, click ok • Draw a point as shown
• Mirror the point around Z axis
• Draw a 3-point arc (start & end at the two points, middle at the point )
• Drag on the curve to adjust radius • Drag the endpoint to make it longer • Click icon “Finish Sketch”
guides):-• Insert/Sweep/Swept
• Select “Single Curve” on selection filter • Select Curve as Section
• Select Curve as Guide 1 • Click “Add new set”
• Select Curve as Guide 2 • Click ok
• Insert/Trim/Trim-and-Extend
• Select “Make Corner” as type • Select a surface as Target
• Select the other surface as Tool
• Reverse arrows so that the result is as shown
• Select the surface as Target • Select Plane as Tool
• (arrow should point backward; if not, reverse it)
• Click ok
• Insert/Detail-Feature/Edge Blend
• Select an edge (all tangent edges are selected automatically; selection filter = tangent curves)
• Specify four points as variable radius points • Enter values as shown
• Click ok 7mm
7mm
3mm 3mm
• Draw one horizontal line at point (Insert/Curve/Line , select “associative”) • Draw one vertical line at point
• Insert/ Curve-from-Curves/Bridge • Select horizontal line as start object • Select vertical line as end object • Select G1 (tangent) as start
• Select G1 (tangent) as end • Select “Associative”
• Orient View to Top View
• Drag the arrows to match the yellow reference
• Select the bridge curve as Curve • Select YZ plane as Mirror Plane • Click ok
• Insert/Curve-from-Curves/Mirror
• Select Sketch.3 as curve
• Select YZ plane as mirror plane • Click ok
• Hide Sketch.6
• Insert/Mesh Surface/Through-Curve-Mesh
• Select Primary Curve 1 &2 • Select Cross Curve 1 , 2 & 3 • (Refer to next page)
• Select “G1 tangent” as first primary continuity, select the surface
• Click ok
Primary curve1
Primary curve 2
Selection filter = Tangent curves Select an edge of Primary curve1 Add New Set
Selection filter = Single Curves
Select the two arcs of Primary curve 2 (Arrow direction same as Curve1) Add New set
3 Cross Curves
To Check if the whole skin can meet the required shape… • Orient view to Top View
• Check
• Orient view to Front View • Check
• Orient view to Right View • Check
• File/ Save
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• Insert/Sketch
• Select Plane.1 , click ok
• Draw a vertical line, then mirror it • Draw two arcs (tangent to lines) • Click icon “finish sketch”
• Insert/Trim/Trimmed-Sheet • Select the surface as Target
• Select the last sketch as Boundary Object • “Normal to Curve Plane”
• Select “Two Point Radius” as Type • Select Start guide
• Select End guide • Select Spine curve • Law type = Constant • Value = 5mm
• Click ok
• Insert/Mesh surface/Through Curves
• Select section1 • Select section2
• Select G2 curvature as First section continuity • Select the last surface
• Select G0 curvature as last section continuity • Flow direction = Perpendicular
• Click ok
• Select the biggest surface as Target • Select other surfaces as Tool
• Click ok
• Analysis/Shape/Draft
• Change draft angle to 3 deg
• An error is found (not enough 3 deg) • Double-click the line
• Add 10 deg
• The bridge curve will be updated (if it is associative)
• (If you forgot to make the bridge curve
“associative”, double-click to edit, drag the end point out and snap onto the endpoint of the line again, select G2.)
• Do Draft analysis again to see if the error is corrected.
• Insert/Design Feature/Extrude • Select the curve
• Enter -20mm as End Limit distance • Click ok
• Insert/Design Feature/Draft • Select “From edges” as type • Select +z as Draw Direction • Select the top edge
• Orient View to Right View
• Drag the draft angle to 10 deg (to match the Yellow reference)
• Click ok
• Insert/Flange Surface/Law Extension • Select the sketch as base profile • Select –Z as reference vector
• Length law = constant, 30mm • Select “Linear” as Angle Law type • Start = 10 deg, End = 2 deg
• Click ok
• Insert/Associative Copy/Mirror Body • Select the surface
• Select yz plane as mirror plane • Click ok
start
• Insert/Detail Feature/Face Blend • Select surface as Chain1
• Select surface as Chain2
• (Both arrows should point inward; if not, reverse it)
• Enter 4.5mm as Radius
• Select “Trim to all input faces” • Click ok
• Repeat the above steps for the opposite side
• Select the origin as start point • Select any point on x-axis
• Enter -50mm as start limit • Enter 50 mm as end limit • Click ok
• Insert/Design Feature/Extrude
• Select the line as section • Select y as direction
• Drag the handle to define the length, longer than the model
• Click ok
• Insert/Combine Bodies/Sew
• Select all surfaces, except the last extruded surface
• Insert/Trim/Trim-and-Extend • Select “Make Corner” as type • Select Target surface
• Select Tool surface
• Reverse arrows so that the result is as shown
• Click ok
To check if the solid can be created:-• Right-click “Name”, deselect
“Timestamp order”
failure of surface-to-solid
conversion:-• Insert/Offset-Scale/Sheets-to-Solid-assistant • Enter 0mm as First Offset & Second Offset • Select the surface
• Click Apply
• Select “Show Sheet Boundary” (two gaps are found)
• Click Cancel
• Right-click “Name”, select “Timestamp order” • Double-click to edit the last SEW feature on
tree
• Increase Tolerance from 0.025 to 0.05
• Select the edge
• Enter 1mm as radius • Click ok
• Insert/Offset-Scale/Shell
• Select “Shell all Faces” as type • Select the solid
• (arrow should point inward) • Enter 2.5mm as thickness • Click ok
• Show all sketches/curves/ datums • Move all sketches/curves to Layer 41 • Move all offset datum planes to Layer 61
• File/Save
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We’ve built the overall shape of the mouse. Now, we are going to create parting surfaces, and then split the master model into separate components.
Check Top View Check Front View Check Right View
• Insert/Sweep/ Swept
• Select Section curve • Select Guide curve
• Select “Anywhere along guide” as section location
• Click ok
• Insert/Design Feature/Extrude
• Select the two surface edges • Select +z value as direction
• Enter 3 mm as start limit, -10mm as end limit • Click ok
• Insert/Offset Scale/Offset Face
• Select the extrude surface
• Enter 2.5mm as offset (arrow pointing inward) • Click ok
guide section
• Insert/Trim/Trim-and-Extend • Select “By Distance” as type • Select the surface edges • Enter 10mm as extension • Click ok
Hide the solid body
• Draw a line (from point to point); select associative
• Insert/Mesh Surface/N-sided Surface • Select the line & the edges
• Select the surface edge • Enter 20mm as extension • Click ok
• Insert/Combine Bodies/Sew • Select the two surfaces
• Click ok
• Insert/Trim/Trim-and-Extend • Select “Make Corner” as type • Select Target surface
• Select Tool surface
• Reverse arrows so that the result is as shown
• Click ok
• Select Datum plane1 on tree, • click ok
• Draw a symmetrical arc as shown • Click icon “finish sketch”
• Insert/Design Feature/Extrude • Select the sketch
• Reverse Direction
• Enter 80mm as distance , click ok.
• Create a sketch on Datum plane 1 • Create an extrude surface (80mm
• Format/Layer settings
• Make layer 41 (curves) invisible • Make layer 61 (datums) invisible • Select all remaining curves/sketches • Format/Move to Layer
• Move them to layer 42
• File Save
• File/New/Assembly
• Enter “Mouse_assembly_a.prt” as file name; in the same project folder
• Click ok
• Select “master_model_a.prt” on the list • Select “Absolute Origin” as Positioning
We are going to split the Master Model into separate parts (part files)…
The outlook of the mouse is controlled by the Master Model. If we make any change on it, the linked parts will be updated automatically. Also, because all components are created from one
model, their surfaces & boundaries can always match among themselves when
• Assemblies/Components/Create New Component
• Select “model” as type
• Enter “upper_body_a.prt” as filename • Click ok, click ok
• Double-click Upper_body on tree (Jump into part level from assembly level)
• Insert/Associative Copy/WAVE geometry linker
• Select the solid & three surfaces • Click ok
• Hide master model (untick it on tree)
• Insert/Trim/Trim Body (3 times) to get this shape • Move all surfaces to Layer 11
• Double-click mouse_assembly (Jump into assembly level from part level)
• Hide (unTick on tree) Upper Body • Show (Tick on tree) mastermodel
• Create a new component (refer to previous steps) • Enter ”right_button_a.prt” as filename
• Copy the solid & parting surfaces from master model
• Hide mastermodel
• Create an Offset Surface (one face only) (0.5mm) • Offset face (1mm, forward)
• Offset face (1mm, upward) • Do 3 Trims
• Double-click mouse_assembly • Hide other component
• Show mastermodel
• Create a new component
• Enter “left_button_a.prt” as filename • Copy the solid & parting surfaces from
master model • Hide mastermodel
• Offset Surface (one face only) (0.5mm) • Offset face (1mm)
• Offset face (1mm) • Do 3 Trims
• Double-click mouse_assembly • Hide other component
• Show mastermodel
• Create a new component
• Enter “middle_button_a.prt” as filename
• Copy the solid & parting surfaces from master model
• Hide mastermodel • Do 2 trims
• Double-click mouse_assembly • Hide other component
• Show mastermodel
• Create a new component
• Save it as “middle_button_a.prt”
• Copy the solid & parting surfaces from master model
• Hide mastermodel
• Offset face (0.5mm, downward) • Trim body
• Double-click mouse_assembly
• Show all components, except mastermodel • Create a new component
• Enter “wheel_a.prt” as filename • Double-click wheel_a
• Insert/Sketch
• Select yz plane (zoom in to view), click ok • Draw a circle at origin (dia 20mm )
• Click “finish sketch”
• Insert/Design feature/Extrude
• Select the sketch
• Enter 3mm as start, -3mm as end • Click ok
• Add Edge Blends 2mm • Move sketch to layer 21
• Double-click mouse_assembly • Assemblies/Components/Move
component
• Select Wheel model
• Click “specify orientation” on the command menu
• Drag the wheel to the correct position • Switch to top view, the wheel is nearly in
the middle of the slot
• Switch to right view, the wheel position is roughly as shown
• Double-click middle_button_a
• Insert/Sketch
• Select xy plane
• Draw a profile slightly bigger than the wheel
• Click icon “finish sketch”
• Insert/Design Feature/Extrude
• Select the sketch
• Select “symmetric value” as limits • Enter 100mm
• Select “Subtract”, select the solid • Click ok
• Double-click “mouse_assembly” on tree
• File/Save all
left
• Apply material texture one by one (just drag and drop)
• Upperbody, leftbutton & rightbutton (aluminium)
• Middle button & wheel (plastic black) • Lowerbody (plastic shiny resin red)
• Double-click any material on list, then we can see “Materials in part”
• Edit “Plastic Black”, change roughness to 0.05
• View/Perspective
• View/Visualization/High-Quality-Image
• Click icon “basic scene editor”
• Deselect “Use Image based lighting”
• Start Shade, then save it as tif
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