DEPARTMENT OF MECHANICAL ENGINEERING
LAB MANUAL
COMPUTER AIDED DRAFTING AND MODELING LAB
(S3 ME)
ST.THOMAS INSTITUTE FOR SCIENCE AND TECHNOLOGY (STIST) THIRUVANANTHAPURAM
08.308 Computer Aided Drafting and Modelling Lab L-T-D: 0-0-2
Credits : 2
(i) Introduction to computer aided drafting and solid modeling: software and hardware. (ii) Understand basic 2D geometric construction techniques. a. Cartesian and polar coordinate systems: locating points, coordinate entry methods, units and limits. b. Object generation: lines, arcs, polylines, and multilines; rectangles, circles, polygons, and ellipses. c. Transformations: move, copy, rotate, scale, mirror, offset and array; trim, extend, fillet, chamfer d. Layers: creation, naming, properties manager. e. Blocks: create, edit, import and explode. f. Text: creating and editing, editing, formatting, text styles. g. Dimensions: creating and editing, dimension styles. (iii) Exercise on basic drafting principles to create technical drawings. a. Create orthographic views of machine parts from pictorial views. b. Create isometric views of machine parts from orthographic views c. Create hatched sectional views of machine parts. (iv) Understanding basic solid modeling techniques a. Creation of solid primitives b. Boolean operations c. Extrude, Revolve operations d. 3D Views (v) Exercise on basic modeling to create machine parts Create solid models from pictorial views
University Examination: Examination: Question paper may contain two parts. Part A shall contain 2D drafting which carries 40% marks, Part B shall contain 3D drafting which carries 40% marks and 20% marks is for viva voce conducted during the exam.
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PART MODELING Exercise No: 1
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Exercise No: 4
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Exercise No: 7
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Exercise No: 10
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Exercise No: 13
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Exercise No: 15
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Exercise No: 17
Exercise No: 18
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Exercise No: 19
Exercise No: 20
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STUDY ON SOLID EDGE Introduction Solid Edge is a 3D CAD parametric feature solid modeling software. It runs on Microsoft Windows and provides solid modeling, assembly modelling and drafting functionality for mechanical engineers, designers and drafters. Through third party applications it has links to many other Product Lifecycle Management (PLM) technologies.
History Solid Edge V1 was first released in 1995. In October 1997 the Sheet Metal environment was introduced with V3.5. UGS Corp switched from the ACIS modeling kernel to Parasolid kernel in 1998 with V5. Solid Edge with Synchronous Technology was launched in 2008. Solid Edge with Synchronous Technology 2 was launched in 2009. Solid Edge ST3 was released on October 13, 2010, and ST4 followed in July 2012 with either modelling mode (Synchronous or Ordered) being available from any part. The last version is Solid Edge ST5 with ST6 due in 2013.
Modeling Ordered
The ordered modeling process begins with a base feature controlled by a 2D sketch, which is either a linear, revolved, lofted, or swept extrusion. Each subsequent feature is built on the previous feature. When editing, the model is "rolled back" to the point where the feature was created so that the user cannot try to apply constraints to geometry that does not yet exist. The drawback is that the user does not see how the edit will interact with the subsequent features. This is typically called "history" or "regeneration based" modeling. In both ordered and synchronous mode Solid Edge offers very powerful, easy yet stable modeling in hybrid surface/solid mode, where "Rapid Blue" technology helps the user to create complex shapes in an intuitive and easy way. Direct
The
Direct
modeling
features
allows
the
user
to
change
model
geometry/topology without being hindered hindered by a native model's existing - or an
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imported model's lack of - parametric and/or history data. This is particularly useful for working with imported models or complex native models. Direct modeling features are available in both Ordered and Synchronous mode. If used in the Ordered mode, the direct modeling edits are appended to the history tree at the point of current rollback just like any other ordered feature. Synchronous
The software combines direct modeling with dimension driven design (features and synchronously solving parametrics) under the name "Synchronous Technology". Parametric relationships can be applied directly to the solid features without having to depend on 2D sketch geometry, and common parametric relationships are applied automatically. Unlike other direct modeling systems, it is not driven by the typical history-based modeling system, instead providing parametric dimension-driven modeling by synchronizing geometry, parameters and rules using a decision-making engine, allowing users to apply unpredicted changes. This object-driven editing model is known as the Object Action Interface, which emphasizes a User Interface that provides Direct Manipulation of objects (DMUI). ST2 added support for sheet metal designing, and also recognizing bends, folds and other features of imported sheet metal parts. Assembly
An assembly is built from individual part documents connected by mating constraints, as well as assembly features and directed parts like frames which only exist in the Assembly context. Solid Edge supports large assemblies (over 100,000 parts).
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DIFFERENT VIEWS OF GIVEN SOLIDS
Exercise No. 1
Exercise No. 2
Exercise No. 3
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Exercise No. 7
Exercise No. 8
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Exercise No. 10
Exercise No. 11
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Exercise No. 13
Exercise No. 14
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Exercise No. 16
Exercise No. 17
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Exercise No. 19
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Figure No: 1
Figure No: 2
Figure No: 5
Figure No: 3
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Figure No: 6
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Exercise No. 1 Date: 3D MODELING OF A SOLID USING SOLID EDGE Aim:
To model the given 3D part (figure 1) using Solid Edge ST5. Commands and Tools used:
Extrude, Line, Rectangle, Circle, Arc, Trim, Smart Dimension, Zoom, Sketch View. Procedure:
1. Start Solid Edge ST5 software. 2. In the opening window, click ‘ISO Part’ for creating a new part file. 3. Save the file in .par format with a suitable file name. While the modeling proceeds, save the work at regular intervals. intervals. 4. Start modeling by selecting the line command, choose an appropriate plane for creating the 2D sketch and lock it (F3). 5. Select ‘Sketch View’ to orient the active view normal normal to the sketch plane. 6. Start drawing the 2D sketch given in figure 2, in the locked plane using different sketch tools. The sketch shown in figure 2 can be drawn using Line and Arc commands. Use Trim command if required. 7. Define the sketch using suitable dimensions. d imensions. Use Smart Dimension tool. 8. After finishing the sketch shown in figure 2, extrude the sketched region to required distance, 56. 9. For extruding the next section of the solid, open a new sketch by selecting the suitable surface in the extruded model and lock the sketch plane. Click ‘Sketch view’. 10.Draw 10. Draw the 2D sketch shown in figure 3 using Line command and dimension it to define the sketch. 11.Extrude 11. Extrude the sketched region to required distance, 100. 12.The 12. The procedure continues for extruding the next section of the given solid. Use Circle command to draw the sketch shown in figure 4. 4 . Dimension it and locate the circle with reference to the extruded e xtruded model. 13.After 13. After defining the sketch, extrude it. The hole in this section is created by drawing another circle (figure 5) on this extruded surface. 14.While 14. While extruding, select Remove material option to create a hole. 15.The 15. The last section of the solid, the rib, is drawn d rawn by creating a new reference plane using the command ‘Coincide Plane’.
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16.The 16. The new plane is created at the middle of the extruded cylinder (parallel to the proposed rib). The sketch shown in figure 6 is drawn in this newly created reference plane. 17.After 17. After defining the sketch, extrusion is done symmetrically about the plane, 9. 18.The 18. The final model should look like figure 1. 19.Select 19. Select a standard view of the model using View Orientation tool and take a screenshot. 20.Save 20. Save the model and close the window. Result:
The given 3D solid is modeled using Solid Edge.
