workshop 18 modifying unigraphics parameters and features

WORKSHOP 18 MODIFYING UNIGRAPHICS PARAMETERS AND FEATURES

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Problem Description 

Demonstrate how to suppress/unsuppress features.

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Demonstrate how to change feature parameters.

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Demonstrate the effects of changing feature parameters used in arrays.

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Demonstrate changing the number of instances in an array.

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Suggested Exercise Steps 1. 2. 3. 4. 5. 6. 7. 8. 9.

Create a new database. Import the Unigraphics part file. Remove the small hole in lower left region of model. Remove other holes. Change the hole pattern inside the counter bore. Change the size and radial position of the holes. Change the number of holes. Change the number of notches and holes back to what they were. Quit MSC.PATRAN.

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 1. Create a New Database a

Create a new database. a. File/New. b. Enter test2 for File name. c. Click OK. d. Under New Model Preferences select Default Tolerance. e. Select MSC.Nastran for Analysis Code. f. Select Structural for Analysis Type. g. Click on OK.

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

d

e f b

c

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g

Step 2. Import Unigraphics File

b

a

c

d Import the Unigraphics part file. a. File/Import… b. Set Object to Model. c. Select Unigraphics for Source. d. Find and select gear.prt for File name. e. Click on Apply. f. Click OK on the Unigraphics Import Summary dialogue.

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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e

Step 3. Remove the Small Hole

a Suppress the small hole in the lower left region of the model. a. Geometry : Edit/ Feature/Suppress. b. Select the hole in the lower left corner(as indicated) for the Geometric Entity List. c. Click on Apply.

b

Note, both features associated with this hole will be highlighted under Feature list

b c

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 4. Remove Other Holes

Eliminate some of the other holes of the part. a. Select both the top and bottom hole in the set adjacent to the left notch (as indicated) using shift picking for Geometric Entity List. b. Click on Apply. c. There should only be 8 holes, a single hole corresponding to each notch.

a

c

a b PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 5. Change the Hole Pattern Inside the Counter Bore

Change the hole pattern inside the counter bore from 4 to 5 holes. a. Geometry : Edit/Feature/ Parameters. b. Under the Feature List select CIRCULAR_ARRAY(4). c. In the Feature Parameter Definition form click in the cell corresponding to Number and Definition. d. Enter 5 for Input Parameter Definition, and click Enter. e. Click on OK. f. Click on Apply.

d

a

c

b e

f PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 6. Change the Size and Radial Position of the Holes

a Change the size and radial position of the holes adjacent to the notches. a. Geometry: Edit/Feature/ Parameters. b. In Feature List select SIMPLE_HOLE(8). c. In the Feature Parameter Definition form click in the cell corresponding to Diameter and Definition, input 18 for Input Parameter Definition. and click Enter. d. Click on OK. e. Click on Apply.

c b

d

e PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 6. Change the Size and Radial Position of the Holes

Change the radial position of the holes lined-up with the notches. a. Select INSTANCE[0](8)/ SIMPLE_HOLE (8) for Feature List. b. Click in the cell corresponding to Positioning Dimension Perpendicular Distance and Definition, enter 27 for Input Parameter Definition, and click the Enter key. c. Click on OK. d. Click on Apply.

b

c a

d PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Note that the holes are larger and closer to the center.

Step 7. Change the Number of Holes

Change the number of holes adjacent to the notches. a. Geometry: Edit/Feature/ Parameters. b. Under Feature List select CIRCULAR_ARRAY(11). c. Click in the cell corresponding to Number and Definition. Note that the cell does not contain a number, but the word FixPosNr. d. Select CIRCULAR_ARRAY(7) for Feature List. e. In the cell for Number and Name notice that the same word appears here. This means that the number of notches equals the number of holes. f. Click in the cell corresponding to Number and Definition, enter 6 for Input Parameter Definition, and click the Enter key. g. Click on OK. h. Click on Apply. PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

a c

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b g

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f

Step 8. Change the Number of Notches/Holes

Change the number of notches and holes back to 8. a. Under Feature List select CIRCULAR_ARRAY(7). b. Click in the cell corresponding to Number and Definition. c. Enter 8 for Input Parameter Definition, and click Enter. d. Click on OK. e. Click on Apply. f. There might be a warning message about not being able to perform the desired action.

c

d

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PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

b

a

If there is a warning it suggests something about the feature suppression state. When attempting to do this in UG an error message is issued that states “error updating feature”.

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Step 8. Change the Number of Notches/Holes

If there is a problem it is with the holes adjacent to the holes centered on the notches; top and bottom holes in the figure. Unsuppress all the adjacent holes. Unsuppress the adjacent holes so can change back to 8 notches and 8 centered holes.. a. Geometry: Edit/Feature/ Unsuppress b. Feature List: select all entries except the two with the number “16” in the name. c. Apply d. Geometry: Edit/Feature/ Parameters e. Feature List: select CIRCULAR_ARRAY(7) f. Click in the cell corresponding to Number and Definition. g. Input Parameter Definition: enter 8, and click Enter h. OK i. Apply PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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Step 9. Quit MSC.Patran a

Quit MSC.PATRAN. a. File / Close.

This ends this exercise.

PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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PAT302, Workshop 18, December 2004 Copyright2004 MSC.Software Corporation

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