best practice part history & modeling

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IMST410-6 I-DEASt Course Guide The Best Practices: Part History and Modeling Strategies Course IMS410–6 061198–Rev.1 kjkjb Tasks Covered IĆDEAS Master Modelert

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Page 1: Best Practice Part History & Modeling

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I-DEAS�

Course Guide

The

Best Practices:

Part History

and Modeling Strategies

Course

IMS410–6061198–Rev.1

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Page 2: Best Practice Part History & Modeling

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This Manual is licensed to the user for the period set forth in the applicable license agreement, subject to termination of the license by Structural Dynamics ResearchCorporation (SDRC) at any time and the Manual at all times remains the property of SDRC or third parties from whom SDRC has obtained a licensing right. Theinformation contained in this Manual including, but not limited to, the ideas, concepts and know-how, is proprietary, confidential and trade secret to SDRC or such thirdparties and the information contained therein shall be maintained as proprietary, confidential and trade secret to SDRC or to such third parties. The informationcontained in this Manual shall not be copied or reproduced in any form whatsoever, nor is any information in this Manual to be disclosed to anyone other than anauthorized representative of the user’s employer who is contractually obligated not to disclose same, without express prior written consent of SDRC. The user of thisManual and the computer program(s) referred to herein retains full control over and is solely responsible for the mechanical design of the user’s equipment, machinery,systems, and products. SDRC makes no warranties of any kind, including the warranty of merchantability or fitness for a particular purpose in respect to the equipment,machinery, systems, and products derived or resulting hereunder, and the user assumes all risks and liability for results obtained by the manufacturing, use orimplementation of the computer program(s) described herein, whether used singly or in combination with other designs or products. SDRC shall not be liable for anyspecial or consequential damages. SDRC makes no warranty that the equipment, machinery, systems, and products derived or resulting hereunder will not infringe theclaims of domestic or foreign patents and further does not warrant against infringement by reason of the user, thereof in combination with other designs, products, ormaterials or in the operation of any process. User shall protect, indemnify and hold harmless SDRC of and from any loss, cost, damage or expense arising from any claimthat is in any way associated with the computer program(s) described in this Manual. Data presented in examples do not necessarily reflect actual test results and shouldnot be used as design criteria.

By acceptance of this Manual, the user agrees to the above conditions and further agrees that this Manual will not be exported (or re-exported from a country ofinstallation), directly or indirectly, separately or as part of a system, without user or user’s employer, at its own cost, first obtaining all licenses from the United StatesDepartment of Commerce and any other appropriate agency of the United States Government as may be required by law.

E Structural Dynamics Research Corporation 1979, 1980, 1983, 1984, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998

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Federal Acquisitions: Commercial Computer SoftwareUse governed by terms of SDRC’s Software License and Service Agreement.

This software is a Licensed Product of and distributed by SDRC and may only be used according to the terms of that license on the system identified in the LicenseAgreement.

SDRC is a registered trademark of Structural Dynamics Research Corporation:The following are trademarks of Structural Dynamics Research Corporation:Concurrent Associativity, DMCS, Desktop PDM, Dynamic Navigator, SDRC working ideas, I-DEAS 3D IGES Data Translator, I-DEAS, I-DEAS AcousticIntensity Measurement, I-DEAS Advanced FEM, I-DEAS Advanced Post-Processing, I-DEAS Beam Modeling, I-DEAS Cost Modeler, I-DEASCorrelation,I-DEAS Data Reader:MSC/NASTRAN, I-DEAS Design Analysis, I-DEAS Design Optimization, I-DEAS Data Translator, I-DEAS Data Translator]ABAQUS to/from I-DEAS, I-DEAS Data Translator] ANSYS to/from I-DEAS, I-DEAS Data Translator] CADAM to/from I-DEAS, I-DEAS Data Translator]CATIA to/from I-DEAS, I-DEAS Data Translator] COSMIC NASTRAN to/from I-DEAS, I-DEAS Data Translator] MSC/NASTRAN to/from I-DEAS, I-DEASDrafting, I-DEAS Drafting IGES Data Translator, I-DEAS Drafting Symbols Catalog, I-DEAS DXF Data Translator, I-DEAS 2D Drafting IGES Data Translator,I-DEAS Electronic System Cooling, I-DEAS Experimental Dynamics, I-DEAS Fatigue, I-DEAS FEM and Analysis, I-DEAS Extended Finite Element Modeling,I-DEAS Finite Element Modeling, I-DEAS FEM, I-DEAS Generative Machining, I-DEAS GNC, I-DEAS GNC Multi–Axis, I-DEAS GNC G–Post, I-DEASHarmonic Post-Processing, I-DEAS Harness Design, I-DEAS Item Manager, I-DEAS JAMA-IS Data Translator, I-DEAS Laminate Composites, I-DEAS MasterAssembly, I-DEAS Master Modeler, I-DEAS Master Series, I-DEAS Master Surfacing, I-DEAS Material Data Catalog – Infodex, I-DEAS Material Data Catalog– Infodex MIL5, I-DEAS Material Data Catalog – Infodex Metals, I-DEAS Material Data Catalog – Plastics, I-DEAS Material Data Catalog – MDLA, I-DEASMaterial Data System, I-DEAS Mechanism Design, I-DEAS Mold Analysis, I-DEAS Mold Base Catalog, I-DEAS Mold Base Data Base, I-DEAS Mold Cooling,I-DEAS Mold Filling, I-DEAS Modal, I-DEAS Modal Analysis Automation, I-DEAS Model Response, I-DEAS Model Solution, I-DEAS Model Solution Linear,I-DEAS Model Solution Nonlinear, I-DEAS Multi–Axis Migration, I-DEAS NC Migration, I-DEAS Open Core, I-DEAS Open Data, I-DEAS Open FEA,I-DEAS Open Geometry, I-DEAS Open Language, I-DEAS Open Interface, I-DEAS Open Link, I-DEAS Optimization, I-DEAS Order Tracking, I-DEAS PCBData Translator, I-DEAS Pearl, I-DEAS Plastics Designer, I-DEAS Plastics Processing, I-DEAS Post Writer, I-DEAS Part Designer, I-DEAS Product Designer,I-DEAS Publishing Package, I-DEAS Rapid Prototyping Data Translator, I-DEAS SET Data Translator, I-DEAS Sheet Metal Design, I-DEAS Signal Analysis,I-DEAS Signal Process, I-DEAS Signal Processing Base, I-DEAS Simulation Advisor, I-DEAS Smart View, I-DEAS Solid Link, I-DEAS Sound QualityEngineering, I-DEAS Standard Parts Catalog, I-DEAS Standard Measurements, I-DEAS Standard Post-Processing, I-DEAS Structural Modification, I-DEASSTEP Data Translator, I-DEAS System Dynamics Analysis, I-DEAS Team Data Manager, I-DEAS Team Design, I-DEAS Team Engineering, I-DEAS Team NC,I-DEAS Test, I-DEAS Test Analysis Interconnect Kit, I-DEAS Test and Measurement, I-DEAS Test Correlation, I-DEAS Test Data Analysis, I-DEAS Test DataDisplay, I-DEAS Thermoset Molding, I-DEAS TMG, I-DEAS TMG Complete, I-DEAS Tolerance Analysis, I-DEAS Transient Measurement, I-DEAS TransientPost-Processing, I-DEAS Variant Engineering, I-DEAS Vibro-Acoustics, I-DEAS VDA-FS Data Translator, I-DEAS View and Markup, I-DEAS Warp andShrink, I-DEAS Wire EDM, SDRC Modal-Plus

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Structural Dynamics Research Corporation2000 Eastman DriveMilford, Ohio 45150(513)576–2400

Page 3: Best Practice Part History & Modeling

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Page 9: Best Practice Part History & Modeling

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Page 10: Best Practice Part History & Modeling

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Page 11: Best Practice Part History & Modeling

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Page 12: Best Practice Part History & Modeling

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Page 13: Best Practice Part History & Modeling

������� �� History trees

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This area contains basic part and featureinformation plus functions for displaying thehistory differently. You can also use the Featurefield to rename a feature.

This area displays the history tree. You can picknodes or dynamically pan the graphic usingMB1.

Use these controls to select nodes in astep-wise fashion. Once you’ve selected thefeature or operation you want, you can rollback to that point to make additions ormodifications.

Use these four buttons on the left to modify,delete, suppress, or unsuppress selectedfeatures directly from this form.

Use these three buttons on the right to controlthe history tree graphical display. You can zoomin, zoom out, or center the display on a selectednode.

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Page 14: Best Practice Part History & Modeling

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Page 15: Best Practice Part History & Modeling

������� �� History trees

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SD–Show Dimensions

F–Feature Parameters

DI–Dimension Values

QW–Quick Wireframe

MD–Multiple Draft

SU–Suppress Feature

R–Replace Feature

AD–Add Relations

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Page 17: Best Practice Part History & Modeling

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Page 18: Best Practice Part History & Modeling

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Page 19: Best Practice Part History & Modeling

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Page 20: Best Practice Part History & Modeling

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Page 21: Best Practice Part History & Modeling

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Page 22: Best Practice Part History & Modeling

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Page 23: Best Practice Part History & Modeling

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Page 24: Best Practice Part History & Modeling

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Page 25: Best Practice Part History & Modeling

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Page 26: Best Practice Part History & Modeling

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Page 27: Best Practice Part History & Modeling

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Page 28: Best Practice Part History & Modeling

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Page 29: Best Practice Part History & Modeling

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Sketch and dimension thegeneral shape of the hinge.

Toggle on Stop at intersectionsand pick the section to extrude.

Extrude 50mm.

Page 30: Best Practice Part History & Modeling

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Match the two horizontaldimensions to the verticaldimension.

Extrude the rectangle, cuttingthrough the part.

Sketch in place on theback face to create arectangular cutout.

Page 31: Best Practice Part History & Modeling

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Extrude the two circles,cutting through the part.

Sketch in place two circles with a 10 mmdiameter centered between the sides ofthe bottom plate. Use a construction lineto keep the holes centered.

Page 32: Best Practice Part History & Modeling

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Pick History Access... pick the part. Dismiss theform. Hold down the right mouse button and pickHistory Access... These are the two ways youcan access a part’s history.

Pick Extrude6 (the holes) from theHistory Access form. Pick SuppressFeature. Update the part.

You can no longer see the circular cutouts on yourpart. Notice on the History Access form that Extrude6,(the circular cutout) is represented by a dashed line,indicating that this feature is suppressed.

Page 33: Best Practice Part History & Modeling

������� ��� History trees

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Pick Extrude6 from the History Access form. Enter a new name in the Feature field.

Notice on the History Access form that thenew name has replaced Extrude6.

Page 34: Best Practice Part History & Modeling

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Page 35: Best Practice Part History & Modeling

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Create a block and shell it inward2mm. Delete the top face whilewithin the Shell command.

From the menus, pick Modify, Special Techs,Reorder Feature. Respond to the prompt Pickfeature to reorder by picking the cutout. Then,respond to the prompt Pick feature to insert afterby holding down your right mouse button andpicking History Access. Pick the part. PickExtrude3 from the History Access form. Thecutout becomes a boss.

Sketch in place on thebottom outside face tocreate a cutout 50 mmdeep.

Page 36: Best Practice Part History & Modeling

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Pick History Access. Pick thepart. Pick Extrude3 from theform. Pick Rollback.

Sketch in place on the bottom face tocreate another 50mm cutout. Updateand rebuild the part. The new cutoutappears as a boss as well.

The second boss appearsas Extrude8 on the HistoryAccess form.

Page 37: Best Practice Part History & Modeling

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Page 40: Best Practice Part History & Modeling

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Page 41: Best Practice Part History & Modeling

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2D variational geometry constraintshave to be on the same plane.

I-DEAS won’t recognize this line asparallel to the triangle on the oppositeface, because they’re on differentplanes.

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Page 42: Best Practice Part History & Modeling

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Page 43: Best Practice Part History & Modeling

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Page 44: Best Practice Part History & Modeling

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Page 45: Best Practice Part History & Modeling

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Page 46: Best Practice Part History & Modeling

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Page 47: Best Practice Part History & Modeling

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Page 48: Best Practice Part History & Modeling

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Page 49: Best Practice Part History & Modeling

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Page 50: Best Practice Part History & Modeling

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Page 51: Best Practice Part History & Modeling

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Extrude

Notice that once the rectangle has beenextruded, one of the lines gets absorbed,while the other is left behind as workbenchwireframe.

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Page 52: Best Practice Part History & Modeling

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Page 53: Best Practice Part History & Modeling

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Page 54: Best Practice Part History & Modeling

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Page 55: Best Practice Part History & Modeling

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Page 56: Best Practice Part History & Modeling

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Sketch in place on the side face as shown.Pick the section to extrude, omitting theinner circle. Make sure you toggle on Stopat intersections. Pick Intersect, Thru All.

Create this basic shape.

The wireframe of the inner circle is attached tothe part’s sketchpad, NOT the feature’ssketchpad. Therefore, if you modify thefeature, you won’t see the inner circle that youomitted from the section.

60

60

Page 57: Best Practice Part History & Modeling

����������� Sketchpads and sketchplanes

In order to move the wireframe of the circleto the feature’s sketchpad, pick Update.Draw a line on the global workplane. Attachthe circle you want to the line.

Pick Modify. Pick the feature. PickWireframe. Notice that the circle youomitted from the section isn’t included.

Update. Pick Modify. Pick the feature. PickWireframe. Now that you can see the circle,you can attach it to the feature’s sketchpad.

Note: An alternative method entails no extrageometry. You could select Attach, pick thewireframe, then when prompted to pick apart to attach to, use MB3, Label and type in“Workbench_wireframe.”

Page 58: Best Practice Part History & Modeling

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Modify the section and add theinner circle.

Pick Attach. Pick the inner circle. Pick theouter circle. Now merge the sketchplanes bycreating a coincident constraint between thetwo centers of the circles.

Update.

5

Page 59: Best Practice Part History & Modeling

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Page 76: Best Practice Part History & Modeling

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Sketch in place a circle on the face that’sco-planar with the workplane.

Get the Hinge you created in thefirst project.

Protrude the circle 20 mm. Pick DisplayFilters, Parts and toggle on Edges.Notice that the edge of the boss againstthe face of the hinge is labeled E52.Toggle off the edge labels.

E1E2

E3 E4

E5

E6

E7PE8

E8PE10

E9

E10 E11

E12

E13

E14

E15

E16

E17

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Page 77: Best Practice Part History & Modeling

�������� ��� Associativity within parts

Pick Modify, pick the feature, pick Wireframe. PickReflect. Pick the section. Respond to the prompt Pickplane to reflect about by holding down the right mousebutton and picking On Curve. Pick the back edge of thepart. Hold down the right mouse button and pick Key In.Enter 50, pick Reflect Only. Update the part.

Pick Fillet. You’ll be prompted to choose an edge –use MB3 to pick Label. You’ll be prompted to enter thename of an item that owns edges, vertices, orsurfaces to fillet. Pick Edge52.

You’ll notice that the fillet doesn’tappear on the boss since youmoved it. Pick History Access andyou’ll see that the noderepresenting the fillet on thehistory tree is yellow.

E1

E2

E3

E4

E5

E6

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E8PE10

E9

E10

E11

E12

E13

E14

E15

E16

E17

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E25

E26

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E30

E31

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E34

E35

E36

E37

E38

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Page 78: Best Practice Part History & Modeling

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In order to add the fillet back in, pick HistoryAccess, FilletRoundInfo, Modify. PickAdd/Change from the pop-up menu andpick the inside edge (E52) of the boss.Enter the fillet radius 3.5mm. Update.

Modify the overall width of the part to60mm. Update. The fillet remains, but partof the feature has been swallowed up. Thisis because you used Reflect, so thefeature isn’t attached to any sketchplane ,it’s only attached to the feature’ssketchpad .

To attach the feature to a sketchplane, modifythe feature wireframe, Move the crosssection 10mm in the Z direction, sketch inplace on the side of the part, and add adimension between the center point of thecircle to one of the sketch edges. Update.

Page 79: Best Practice Part History & Modeling

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Page 83: Best Practice Part History & Modeling

����������� Sketch-in-place relations

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Page 84: Best Practice Part History & Modeling

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Get the hinge that you createdfrom a previous project.

Fillet the sides of the bottom face 20mm.

Delete the holes feature. Update.

Page 85: Best Practice Part History & Modeling

����������� Sketch-in-place relations

Sketch in place on the inside bottom face tocreate a rectangle, as shown. Create a linefrom the center of the back edge of the hingeto the center of the rectangle’s edge. Createa perpendicular constraint between the lineand the back edge of the hinge.

Create two Tan to three circles andmodify the dimensions, as shown.

Extrude as a Cutout Thru All the slot. Cutdown to the outside bottom surface. Makesure you toggle on Stop at intersections. Ifyou shade the part, you’ll see that the filletoverlaps the top of the slot.

Page 86: Best Practice Part History & Modeling

�� ���������

Notice the out-of-date sketch edges. Drag thedimension for the line you created from theyellow out-of-date sketch edge to the bluesection line. Or, you could delete the dimensionand replace it, or delete the yellow edge itself,which would also delete the dimension.

Remove all of the constraints related toout-of-date sketch edges and replace them inrelation to the new edges. Replace the line fromthe edge of the rectangle to the back edge of thehinge and add a perpendicular constraint. PickUpdate, Modify Wireframe.All of the out-of-date sketch edges are

gone and, if you look at the history tree,Extrude14* is no longer yellow.

Pick History Access. You’ll see thatExtrude14* is a yellow node, signifyinga problem (out-of-date sketch edges).Pick Extrude14* from the history tree.Pick Wireframe.

To make the fillet incorporate the slot, make suremenus are turned on and pick Modify, SpecialTechniques, Reorder Feature. Respond to theprompt Pick feature to reorder by picking thefillet. Respond to the prompt Pick feature to insertafter by picking the slot. Update and look at theshaded view of the part.

Page 87: Best Practice Part History & Modeling

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Page 88: Best Practice Part History & Modeling

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CutJoin

Intersect

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Page 89: Best Practice Part History & Modeling

������� �� Construction relations

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Page 90: Best Practice Part History & Modeling

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Page 91: Best Practice Part History & Modeling

���� ��� Construction relations

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Join7

Block3Cylinder6

Left Node� second part picked� provides name to constructed part� stationary node

Right Node� first part picked� adopts name of left node� movable node

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Page 92: Best Practice Part History & Modeling

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Turn Relations On

kjkjb

cutter part

Relationship defined:cutter part positioned with bottomsurface coplanar and center line endpoint coincident with part to be cut

part to be cut

resulting part

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Page 93: Best Practice Part History & Modeling

���������� Construction relations

��������� ���� ���� � ����� �� ����

kjkjb

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Page 94: Best Practice Part History & Modeling

�� ����������

kjkjb

Extrude a 30mm blockin space and name it.

Create a circle with 15 mm diameter and center locatedat (50, 0) on the local origin (to see this origin, turn onLocal Origin under Display Filters). Extrude the circle15mm. Create a circular pattern of 8 with a 50mm radius.Align the X axis with the X axis of the local origin (makesure the local origin is visible in display filters). Name thepattern Circular Feature.

Pick Cut. Make sure relations are turned on. Pick the circularpattern. Pick the front face of the block. Pick CoincidentPoints, MB3, Between. Pick the top left corner and the bottomright corner of the block. Enter 50%. Pick the center point ofthe pattern. Pick Parallel Edges. Pick the center line of thepattern and the edge of the block. Pick Done.

(50, 0)

Page 95: Best Practice Part History & Modeling

������������ Construction relations

kjkjb

Sketch on the workplane, creating a 15mmsquare in approximately the same positionas the original circle. Extrude the square15mm. Create a circular pattern of 8 with a50mm radius. Align the X axis with the Xaxis of the local origin.

Replace the circle pattern with the square pattern.

Pick History Access, then pick the pattern feature (not theCircularPatInfo node) from the history tree. Pick Modify,Replace feature. Under MB3, pick Use feature orientation.Pick the new pattern.

Update. Look at the shaded view of the part. PickModify. Pick the block. Pick Show dimensions.

Note: If you constructed this replacement pattern withoutlocating it at 50, 0 on the local origin, DO NOT pick the Usefeature orientation option. Also, note that when a feature isreplaced, all existing construction relations are removed,which means that the replacement pattern will not move tothe block. You’ll have to add relations, as shown on thefollowing page.

Page 96: Best Practice Part History & Modeling

�� ���������

kjkjb

Change the extrude distance for the blockto 40mm. The pattern gets swallowed intothe block because relations are missing.

Update. Now that the relations have beenestablished, if you change the extrusiondistance, the pattern will be preserved.

Pick History Access, then pick the pattern feature againfrom the history tree. Pick Modify, then Add relations.Pick the circular pattern. Pick the front face of the block.Pick Coincident Points, MB3, Between. Pick the top leftcorner and the bottom right corner of the block. Enter50%. Pick the center point of the pattern. Pick ParallelEdges. Pick the center line of the pattern and the edge ofthe block. Pick Done.

Page 97: Best Practice Part History & Modeling

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kjkjb

RF1

RF3

RF2

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Extrude3 Extrude6

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Page 98: Best Practice Part History & Modeling

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Page 99: Best Practice Part History & Modeling

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Page 100: Best Practice Part History & Modeling

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new coordinate system

base coordinate system

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Page 101: Best Practice Part History & Modeling

���������� Reference geometry

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y-translation

z-translation

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rotation-z rotation-x

rotation-y

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Page 102: Best Practice Part History & Modeling

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Page 103: Best Practice Part History & Modeling

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Page 104: Best Practice Part History & Modeling

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kjkjb

I-DEAS displays your reference point andits dimensions as you create them. Onceyou update your part, these dimensionsare no longer displayed.

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Page 105: Best Practice Part History & Modeling

����������� Reference geometry

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with respect to this vertex

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Page 106: Best Practice Part History & Modeling

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Controls the offset distance and the surface towhich the series will be oriented

Controls the series range, starting and endinglocations, and starting direction

Controls the general pattern, the total numberof reference points, and the actual placement ofeach individual reference point in the series

Controls characteristics such as snapdistances, the name of the series, and theindividual reference points themselves

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Create Points on Trimmed Surface Only

Off (default)

(using 10 points in series)

On

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�( #� '���'�#�� (�' �( $%) $#(

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Page 117: Best Practice Part History & Modeling

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Reference Geometry Options

Method of Placement (under MB3)

Reference Points

BetweenTranslated (using translation x, y, z values)

Translated (using Along vector)On Curve

On SurfaceEdge Relations

Offset from Coordinate SystemOffset from Point

Modifiable Parameters

% between two pointsX, Y, Z offset values from translated point

Distance along vector% along curve

% s and t values on surfaceAll dimensional constraint values

All dimensional constraint values

Change original curve as well as featureparameters (see next page); also can modifythe dimensional values for Edge, Offset,Start/End distances or % distance along theseries curve for individual points (all via thedimensional values)

Key-in X,Y, Z Key-in values

All dimensional constraint values

Series

Reference LinesBetween

Translated

% between two vectors

Translation offset value

Edge Relations

% s and t values on surface

% along curve

All dimensional constraint values

Normal to Surface

Reference Planes

Curve Normal

Surface Tangent

Angled Surface

Offset Surface Offset dimensional constraint value

% along curve

Angle dimensional constraint value

% s and t values on surface

X, Y, Z offset values from original coordinatesystem

Coordinate SystemsTranslate

(based on another coordinate system)

Rotate Rotations about X, Y, Z axes

Curve Tangent

Page 119: Best Practice Part History & Modeling

������������� Reference geometry

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Page 120: Best Practice Part History & Modeling

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Make sure your units are set to inches. Thencreate a coordinate system which references theworkplane, and name it Parabolic Receiving Dishor PRD.

Place three reference points usingMB3, Offset from Coord Sys. Enterthese coordinates: (0,2,0), (10,6,0),(20,15,0).

Note that the coordinates are arbitrary, sinceyou’ll control their position with equationslater.

Page 121: Best Practice Part History & Modeling

������������ Reference geometry

Now you’ll create a mathematicalrelationship between the points. Pick PartEquations and enter the information shownon the Equations form.

Pick Apply and OK, and update your partwith the current equation values.

Set the Y coordinate dimension for eachreference point to From Equation.

Page 122: Best Practice Part History & Modeling

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Sketch in place on the XY plane of the coordinatesystem to create a conic by three points. Pick theConic command, then use MB3, Options to set theconic ratio to .5.

Pick the focus points just created and constrainthe conic wireframe to those points. (Hint: Adda coincident point constraint between the conicand the middle reference point.)

Before you continue, it’s important to fullyconstrain the conic to the points. You shouldalso add a horizontal line from the firstreference point and make the conic tangent toit.

Focus on the reference points youcreated by picking, MB3, Focus, for eachpoint.

Page 123: Best Practice Part History & Modeling

������������ Reference geometry

Sketch and convertto reference curves.

Offset the conic with the associativityswitch 0.125 inches in the negativedirection.

Create reference curves from the originaland offset conics.

Sketch in place on the XY plane and connectthe ends of the reference curves using lines.Create more reference curves from theselines.

Sketch and convertto reference curves.

Page 124: Best Practice Part History & Modeling

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Revolve a section created from the referencecurves around the Y axis of the coordinatesystem.

Next you’ll make the dish elliptical. If you wantto fully constrain the ellipse in the dish, thesteps are given on the following pages. In theinterest of time, you may want to continuewith the workshop on page 151. Theconstraints can always be added later.

To constrain the ellipse, sketch on the XZplane of the base node coordinate system.

Axis of revolution

Page 125: Best Practice Part History & Modeling

������������� Reference geometry

Sketch a rectangle by two points (makesure you don’t constrain it to the existinggeometry) and sketch lines from theorigin of the ellipse to the midpoints of theedges of the rectangle.

While sketching on the XZ plane, focus to theorigin. Sketch an ellipse and make the centercoincident with this focus point.

Sketch lines from the origin to the midpoint onthe ellipse at the major and minor axes.

Page 126: Best Practice Part History & Modeling

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Constrain the line labeled A to beperpendicular to the line labeled B.

Add a vertical ground toconstrain the line B as shown.

A

B

Constrain the line labeled C to beperpendicular to the line labeled D.

C

D

B

Page 127: Best Practice Part History & Modeling

������������ Reference geometry

You can sketch a circle centered from theorigin and focus on the existing dish edge.Then constrain the rectangle to the circle withcoincident constraints. Now modify thedimension as shown to 11.719 in.

Create tangent constraints to the edges ofthe rectangle and the ellipse. Make sure thatthe top edge of the rectangle is parallel to lineB.

Page 128: Best Practice Part History & Modeling

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If you’ve skipped the preceding pages whichdetail how to fully constrain the ellipse, sketchon the XZ plane and sketch as shown. (Theexact dimensions don’t matter.)

Pick the ellipse and extrude it as anIntersection, Thru All to create aparabolic receiving dish.

If you wish, change the dimensions (forexample, the focus variable on the Equationsform) for either version (fully constrained orunconstrained) and observe how the dishchanges when updated. To understanddesign intent, observe the connectionbetween the equations and the constraints.

Page 129: Best Practice Part History & Modeling

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Page 130: Best Practice Part History & Modeling

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Page 132: Best Practice Part History & Modeling

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Page 133: Best Practice Part History & Modeling

���������� �Constraint networks

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Page 134: Best Practice Part History & Modeling

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Cut7

Extrude6*Cut5

Extrude3 Extrude4*

part networkpart sketchpad

featuresketchpad feature

network

featuresketchpad feature

network

featuresketchpad feature

network

part sketchpad network

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Page 135: Best Practice Part History & Modeling

��������� ���Constraint networks

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The constraint system results in a singularity at thecurrent configuration. Use Check Constraints underUpdate Options... to verify whether the constraintset is truly redundant.

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Page 136: Best Practice Part History & Modeling

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Page 137: Best Practice Part History & Modeling

��������� ���Constraint networks

l

ww ll

w

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Create this geometry and add/modifydimensions as shown. Make sure yourelabel the dimensions.

Fill in the Equations form to control the area of this crosssection. Make sure you match the dimensions as shown.

ww

ll

l

w

Page 138: Best Practice Part History & Modeling

��� ��������

Extrude the section 100mm.

Sketch in place on thefront face of the solid andadd the dimensions shown.

Fill in the Equations form to control the gapsize on each side of the wireframe.

Be sure to pick the reference dimensionwhen prompted to Pick entity. This givesaccess to the part sketchpad network.

Page 139: Best Practice Part History & Modeling

��������� ���Constraint networks

kjkjb

Sketch in place on the top face ofthe solid.

Extrude the wireframe fromthe first sketchplane.

Notice on the Equations form that the dimensionsfrom both sketchplanes are visible in the part’ssketchpad constraint network (again, pick the samedimension).

Page 140: Best Practice Part History & Modeling

��� ��������

kjkjb

Look at the Equations form (this time pickinganywhere on the remaining wireframe). Theequations you entered for the extrusion youjust created have been absorbed into thefeature and are no longer accessible in thepart’s sketchpad constraint network.

Modify the width of the geometry you created onthe top face of the solid by matching it to the widthof the extrusion on the front face of the solid. Thismatching equation belongs to the part’s constraintnetwork.

Pick Show Dimensions. Thedimensions you see are controlledby the part’s constraint network.

Page 141: Best Practice Part History & Modeling

�������� ���Constraint networks

kjkjb

Look at the Equations form. The widths of bothsections match.

Look at the Equations form (this timepicking one of the dimensions from theopen feature’s wireframe). Notice theonly dimensions visible on this form arethose that are part of this feature’sconstraint network.

To access the constraint networkof the feature you created on thefront face of the solid, modify itswireframe.

Page 142: Best Practice Part History & Modeling

��� ��������

kjkjb

Access the wireframe of theoriginal extrusion.

Look at the Equations form to see theoriginal feature’s constraint network andthe equation we used to control the areaof the cross section. You must go to thewireframe to modify this equation. Thesevariables are only available in the featureconstraint network, because they’re usedin equations by that network.

Page 143: Best Practice Part History & Modeling

������ � ���Constraint networks

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Set your units to inches. Create a baseorphan reference node (using a referencecoordinate system), align it with the globalcoordinates, and name the part keyway.

Modify the coordinates to cylindrical.

Sketch in place on the R,Θ plane of thecoordinate system. Focus on the origin andsketch a circle that is 0.5 in. diameter.

Extrude the circle 4 inches.

Place a reference point offset from thecoordinate system at (0.25, 270, 0). Modifythe R value of the reference point so that it’smatched to equal half the diameter of theshaft (R=dia/2).

Note: It may be easier to differentiate theshaft diameter from the other dimensions ifyou change the label name to “dia.”

Page 144: Best Practice Part History & Modeling

��� ���������

s

W

Place a reference plane (MB3,SurfaceTangent) on the cylindrical surface. Use PointProject and pick the reference point youcreated. Then create a reference plane fromthe last reference plane created (MB3, OffsetSurface), and place it within the shaft anarbitrary distance away. You’ll control thisdistance later using equations.

Sketch in place on the offset reference plane.Draw a rectangle by center, and constrainand dimension it as shown. Make sure it’sfully constrained.

RF1_Z

dia

RF1_R

SurfaceOffset

s, surface offset

W, width

Cut the shape upward Thru All. Change thelabel on the width dimension to be “W” byModify and pick the dimension. Also changethe label of the Offset distance for thereference plane to “s”. Both dimensions willbe controlled by equations later.

Page 145: Best Practice Part History & Modeling

��������� ���Constraint networks

dia – W2

The last two equations are from thehandbook. “Y” is the chordal height and “s” isthe depth of the shaft keyseat, which is theoffset surface distance.

Pick equations and pick the part. TheEquations form shown is based on tables forkeyways in The Machinery’s Handbook*. The“if” statements set up the conditions for theranges of diameter. The width “W” is given bythe handbook for certain ranges of shaftdiameter; the height of the keyway is alsogiven by the handbook for square andrectangular keyways.

The “srs” value (square rectangular switch)represents a switch you can use to changethe value in the initial conditions form tospecify rectangular or square. This “srs”value is related to the range of diameters.

This workshop represents just two rangesfrom the handbook.

(Note that the equation form is presented infull on the next page.)

Observe the changes that occur whenmodifying the diameter. The point of theconditions is that you only have to modify thediameter and the “srs” to get the right keyway.

Y

Y=dia–

2

s= dia–Y–H / 2

*The Machinery’s Handbook, New YorkIndustrial Press.

H=height of keyway

2

2H

s

Page 146: Best Practice Part History & Modeling

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Page 147: Best Practice Part History & Modeling

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Page 148: Best Practice Part History & Modeling

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reference geometry

symbol for minor operation

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Page 149: Best Practice Part History & Modeling

������� ���� Using minor operations

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Page 150: Best Practice Part History & Modeling

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Page 151: Best Practice Part History & Modeling

������� ��� Using minor operations

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Page 152: Best Practice Part History & Modeling

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Page 153: Best Practice Part History & Modeling

�������� ��� Using minor operations

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Page 154: Best Practice Part History & Modeling

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Page 155: Best Practice Part History & Modeling

�������� ���� Using minor operations

Get the hinge from a previous project. Delete theboss on the side surface if it’s still there. PickReference Plane. Pick the bottom face.

Pick Reference Plane. Pick the top centerpoint of the slot and any two of the fourcenter points of the top two holes for thepoint.

Pick Reference Plane, MB3, OffsetSurface. Pick the back plane of thehinge and specify a distance of 40.

Page 156: Best Practice Part History & Modeling

�����������

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Pick History Access. Toggle onShow Steps. Pick Extrude3.

Note that Reference planes 1 and3 have been attached to theExtrude3 node on the history tree.

Pick FilletRound12 from the top ofthe history tree. 1

3

Page 157: Best Practice Part History & Modeling

�������� ���� Using minor operations

kjkjb

Notice that Reference plane 2belongs to the FilletRound node onthe history tree.

Pick Cut5 from the history tree. PickRollback so that you can attach newreference geometry at this point in thehistory tree.

2

3

1

Page 158: Best Practice Part History & Modeling

�����������

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Notice the new reference plane.It’s been added to the history ofthe part.

Update.

Pick Reference Plane, MB3, OffsetSurface. Pick the front face andspecify a distance of 15.

Page 159: Best Practice Part History & Modeling

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Page 160: Best Practice Part History & Modeling

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Reduce the size from 6” to 5”.

Correct any resulting problems. Once you’ve correctly modifiedthe index table base, you should move the arm from the left sideto the right side.

Retrieve the index tablebase from the library.

Page 161: Best Practice Part History & Modeling

������������ Final workshop

kjkjb

Your completed index tablebase should look like this.

After moving the arm, make sure the holeextends into the base’s center.

Page 162: Best Practice Part History & Modeling

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Page 163: Best Practice Part History & Modeling

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Page 164: Best Practice Part History & Modeling

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