SolidWorks Assembly Files. Assemblies Mobility. The Mating Game Mating features. Mechanical Mates Relative rotation about axes
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1 Assemblies Mobility SolidWorks Assembly Files An assembly file is a collection of parts The first part brought into an assembly file is fixed Other parts are constrained relative to that part (or other parts) using mating relations CAD suspension model by Patrick Powers CAD/Fab Assemblies & Mobility 2 The Mating Game Mating features Esp. useful for Points (incl. vertices, sketch points) parts with Lines (incl. edges, axes, sketch lines) curved surfaces Planes (incl. front, top, right, reference planes) Cylindrical features (cylinders, holes) Spheres Surfaces remain tangent Mechanical Mates Relative rotation about axes Cam Mate Gear Mate CAD/Fab Assemblies & Mobility 4 1
2 Editing Parts in Assemblies In an open part document file Directly in assembly view Inserting Component Directly in Assembly Feature manager tree turns blue Rest of assembly becomes transparent CAD/Fab Assemblies & Mobility 5 1. Open sketch 2. Convert entitity 3. Extrude thin feature Part is fixed in place (until mate suppressed) CAD/Fab Assemblies & Mobility 6 Exploded Views Exploded views show how components relate to each other Useful in assembly drawings Exercise Choose the correct front view None (a) (b) (c) (d) (e) CAD/Fab Assemblies & Mobility 7 8 2
3 Try each alternative Question Edges don t appear in front view How many degrees of freedom does a rigid body floating in space have? A. Zero (a) (b) All edges consistent & appear in each view B. One C. Two D. Three E. Six y x (c) (d) z 9 CAD/Fab Assemblies & Mobility 10 Degrees of Freedom Number of variables needed to uniquely define the position of a rigid body in space, relative to a fixed frame of reference Consider a rigid body in space: Unconstrained y 3 position coordinates: x, y, z θ y 3 angles: θ x, θ y, θ z θ z θ x x This body has 6 degrees of freedom 6 d.o.f. z 0 d.o.f. = structure or assembly 1 d.o.f. = moveable linkage or mechanism CAD/Fab Assemblies & Mobility 11 CAD/Fab Assemblies & Mobility 12 3
4 One Plane Constrained Second Plane Constrained Coincident mate 1 d.o.f. 3 d.o.f. Coincident mates CAD/Fab Assemblies & Mobility 13 CAD/Fab Assemblies & Mobility 14 Third Plane Constrained Kinematic Pairs (Joints) 0 d.o.f. (fixed) Coincident mates CAD/Fab Assemblies & Mobility 15 CAD/Fab Assemblies & Mobility 16 4
5 Kinematic Pairs (Joints) Name Symbol D.O.F. Notation Comment Revolute R 1 p 1 e.g. Hinge Prismatic P 1 p 1 Linear slider w/o rotation Cylindrical C 2 p 2 Slide & rotate Spherical S 3 p 3 3 independent rotations Question How many degrees of freedom does this linkage have? A. Zero B. One C. Two D. Three E. Six CAD/Fab Assemblies & Mobility 17 CAD/Fab Assemblies & Mobility 18 Question Question How many degrees of freedom does this linkage have? A. Zero B. One C. Two D. Three E. Six How many degrees of freedom does this linkage have? A. Zero B. One C. Two D. Three E. Six CAD/Fab Assemblies & Mobility 19 CAD/Fab Assemblies & Mobility 20 5
6 Linkage Mobility Linkage = set of rigid links connected by joints Kutzbach-Grübler criterion for planar (2D mechanisms) ( n 1) 2p1 2 f = 3 p n = 3 p 1 = 3 p 2 = 0 Examples ( n 1) 2p1 2 ( 3 1) 2(3) 0 0 f = 3 p f = 3 = Truss (fixed structure) Where: n = number of links p 1 = number of joints w/ 1 d.o.f. p 2 = number of joints w/ 2 d.o.f. n = 4 p 1 = 4 p 2 = 0 f ( 4 1) 2(4) 0 1 = 3 = Four bar mechanism (moveable linkage) CAD/Fab Assemblies & Mobility 21 CAD/Fab Assemblies & Mobility 22 Truss Structures Four Bar Mechanism Internal combustion engine Roof Structure Bridge Crane CAD/Fab Assemblies & Mobility Slider-crank linkage n = 4 (count the engine block) p 1 = 4 p 2 = 0 f = 1 CAD/Fab Assemblies & Mobility 24 6
7 4 Cylinder Boxer Engine Automobile Suspension CAD/Fab Assemblies & Mobility 25 CAD model by Patrick Powers CAD/Fab Assemblies & Mobility 26 James Watt Watt Linkage Invented by James Watt in 1784 to guide the piston of his steam engine in a straight line Using SolidWorks Drawings to Design Linkages CAD/Fab Assemblies & Mobility 27 CAD/Fab Assemblies & Mobility 28 7
8 Watt Linkage Still used in automobile suspensions Complete the views See for an animated demonstration CAD/Fab Assemblies & Mobility 29 CAD/Fab 3 - Intro to Solid Modeling 30 Solution GDi Project CU participated in the Global Design Initiative in Three university teams around the world designed a complete Formula SAE race car in just five 24-hour days. Each team worked on the car for eight hours, then shipped the SolidWorks CAD files to the next team. CAD/Fab 3 - Intro to Solid Modeling 31 CAD model courtesy of James Longino CAD/Fab Assemblies & Mobility 32 8
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