Date post: | 15-Jan-2017 |
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Chapter 2 Sketching 1
Chapter 2Sketching2.1 Step-by-Step: W16x50 Beam
2.2 Step-by-Step: Triangular Plate
2.3 More Details
2.4 More Exercise: M20x2.5 Threaded Bolt
2.5 More Exercise: Spur Gears
2.6 More Exercise: Microgripper
2.7 Review
Chapter 2 Sketching Section 2.1 W16x50 Beam 2
Section 2.1W16x50 Beam
16.2
5"
.628 "
.380"
7.07 "
R.375"
W16x50
[1] Wide-flange I-shape section.
[2] Nominal depth 16 in.
[3] Weight 50 lb/ft.
Problem Description
Chapter 2 Sketching Section 2.1 W16x50 Beam 3
• Start up <DesignModeler>
• Sketching/Modeling modes
• Draw>Rectangle
• Draw>Polyline
• Dimensions>General
• Dimension>Horizontal
• Dimensions>Display
• Dimensions>Move
• Modify>Copy/Paste
• Modify>Trim
• Modify>Fillet
• Constraints>Symmetry
• Auto Constraints
• Constraint Status
• Extrude
Techniques/Concepts
Chapter 2 Sketching Section 2.1 W16x50 Beam 4
[1] Click: single selection
[2] Control-click: add/remove selection
[3] Click-sweep: continuous selection.
[4] Right-click: open context menu.
[5] Right-click-drag: box zoom.
[6] Scroll-wheel: zoom in/out.
[7] Middle-click-drag: rotation.
Basic Mouse Operations
Chapter 2 Sketching Section 2.2 Triangular Plate 5
Section 2.2Triangular Plate
40
mm
30 mm
300 mm
[1] The plate has three planes of
symmetry.
[2] Radii of the fillets
are 10 mm.
Problem Description
Chapter 2 Sketching Section 2.2 Triangular Plate 6
Techniques/Concepts
• Draw>Arc by Center
• Dimensions> Radius
• Modify>Replicate
• Modify>Offset
• Constraints>Equal Length
• Weak/Strong Dimensions
• Weak/Strong Constraints
• Selection Filter
• Single/Box Selection
Chapter 2 Sketching Section 2.2 Triangular Plate 7
2D Graphics Controls
[8] <Undo>.
[9] <Redo>.
[2] <Zoom to Fit>.
[4] <Box Zoom>.[5] <Zoom>.
[1] <Look At Face/Plane/Sketch>.
[6] <Previous View>.
[7] <Next View>. [3] <Pan>.
Chapter 2 Sketching Section 2.3 More Details 8
• Pull-down Menus
and Toolbars
• Mode Tabs
• Tree Outline
• Sketching
Toolboxes
• Graphics area
• Details View
• Status Bar
• Separators
Section 2.3 More Details
Chapter 2 Sketching Section 2.3 More Details 9
[1] Currently active plane.
[2] To create a new plane, click <New
Plane>.
[3] There are many ways of creating new planes.
Sketching Planes
• A sketch must be created on a
sketching plane; each plane may
contain multiple sketches.
• In the very beginning of a
<DesignModeler> session, three
planes are automatically created:
<XYPlane>, <YZPlane>, and
<ZXPlane>.
Chapter 2 Sketching Section 2.3 More Details 10
Sketches
• A sketch consists of points and edges; edges may be straight lines or curves.
• Multiple sketches may be created on a plane.
[1] To create a new sketch on the active sketching plane,
click <New Sketch>.
[2] Currently active sketch.
Chapter 2 Sketching Section 2.3 More Details 11
Auto Constraints
• C - The cursor is coincident with a line.
• P - The cursor is coincident with another point.
• T - The cursor is a tangent point.
• ⊥ - The cursor is a perpendicular foot.
• H - The line is horizontal.
• V - The line is vertical.
• // - The line is parallel to another line.
• R - The radius is equal to another radius.
[1] You can turn on/off <Auto Constraints>.
Chapter 2 Sketching Section 2.3 More Details 12
Sketching Toolboxes
Chapter 2 Sketching Section 2.4 M20x2.5 Threaded Bolt 13
Section 2.4M20x2.5 Threaded Bolt
Problem Description
M20x2.5
[1] Metric system.
[2] Nominal diameter
d = 20 mm.
[3] Pitchp = 2.5 mm.
Chapter 2 Sketching Section 2.4 M20x2.5 Threaded Bolt 14
32
11×
p=
27.5
d
1
d
Externalthreads(bolt)
Internalthreads(nut)
H
H4
H8
p
Minor diameter of internal thread d
1
Nominal diameter d
H = ( 3 2)p = 2.165 mm
d1= d − (5 8)H × 2 =17.294 mm
p
Chapter 2 Sketching Section 2.4 M20x2.5 Threaded Bolt 15
• Dimensions>Angle
• Modify>Replicate
• Revolve
Techniques/Concepts
Chapter 2 Sketching Section 2.5 Spur Gears 16
Section 2.5Spur Gears
Problem Description
• To satisfy the fundamental law
of gearing, the gear profiles
are cut to an involute curve.
Chapter 2 Sketching Section 2.5 Spur Gears 17
[7] Common tangent of the pitch circles.
[6] Contact point (pitch
point).
[8] Line of action (common normal of contacting gears). The pressure angle is 20o.
[3] Pitch circlerp = 2.5 in.
[9] Addendumra = 2.75 in.
[10] Dedendumrd = 2.2 in.
[1] The driving gear rotates clockwise.
[2] The driven gear rotates
counter-clockwise.
[4] Pitch circle of the driving gear.
[5] Line of centers.
[12] The fillet has a radius of
0.1 in.
[11] The shaft has a radius of 1.25 in.
Chapter 2 Sketching Section 2.5 Spur Gears 18
Techniques/Concepts
• Draw>Construction Point
• Draw>Spline
• Modify>Replicate
• Constraints>Perpendicular
Chapter 2 Sketching Section 2.6 Microgripper 19
Section 2.6Microgripper
Problem Description
[2] Actuation direction.
[1] Gripping direction.
[3] SMA actuator.
[4] Glass bead.
Chapter 2 Sketching Section 2.6 Microgripper 20
480
144
176
280
400
140
212
77
47
87
20
R25 R45
32
92
D30
Unit: µm
Thickness: 300 µm
Chapter 2 Sketching Section 2.6 Microgripper 21
Techniques/Concepts
• Constraints>Equal Radius
• Copy bodies (Mirror)
• Create new sketch
• Constraints>Tangent
• Multiple parts