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Becoming an Autodesk Inventor Professor in 90
MinutesJ.D. Mather Pennsylvania College of Technology
MA105-1L Looking for that one tip that will justify trip to AU. If youre an intermediate Inventor user,then youll find it here . This session offers a fast-paced delivery of productivity tips and problem-solvingstrategies gained from teaching hundreds of students how to use Inventor. If your co- workers dont call youthe Inventor Professor after this class you should consider another major!
About the Speaker:Dr. Mather is an assistant professor of CAD and Product Design at Pennsylvania College of Technologyaffiliate of Penn State University. He has taught AutoCAD courses for 13 years and has been anAutodesk Inventor Certified Expert since release 7. His advanced 3D Modeling tutorials are studied byusers around the world.http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm Previously he worked in industry for 15 years, including positions as Journeyman Machinist, Research &Development Technician and Industrial Engineering Technician.
http://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdf http://home.pct.edu/~jmather/AU2007/MA105-1L%20Dataset.zip
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htmhttp://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htmhttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdfhttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdfhttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Dataset.ziphttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Dataset.ziphttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Dataset.ziphttp://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdfhttp://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm8/7/2019 MA105 1L Mather
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Becoming an Autodesk Inventor Professor in 90 Minutes
Setting up the Environment
Before we get into the class proper, we need to do some housekeeping so that we are all usingthe same keyboard (user interface).
Sketching is the foundation of Inventor. I am pretty particular about how I set up the sketchenvironment.
o 1. I turn off the Grid Lines .I like the clean screen graphics window. In Inventor we use a sketching techniquerather than the direct distance entry technique of AutoCAD. The rough equivalentworkflow in Inventor is achieved if you
o 2. Checkmark the Edit dimension when created box.o 3. Uncheck the Autoproject edges for sketch creation and edit . (Ill explain why later.
A new option in Inventor 11 is the Autoproject part origin on sketch create. I like tothink Autodesk included this feature just for me after several years of persistentrequests. (Thanks go to Neil Munro for the precursor add-in.)
o 4. Checkmark the Autoproject part origin on sketch create.
1
2
3
4
Assistants we will jump ahead to#7 and have the students Importthese settings. (New in r2008)
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Becoming an Autodesk Inventor Professor in 90 Minutes
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5. On the Assembly tab uncheck Constraint Audio Notification or change the ProgramFiles\Autodesk\Inventor 2008\Bin\Connect.wav file to something really cool.
o 6. For projection in a training classroom the Sky Color Scheme seems to give the bestcontrast.
5
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 7. If you are projecting in a classroom or if your eyesight is poor you might want toincrease the Annotation scale on the General tab. This will make sketch dimensions
easier to see from a distance.
You can export the settings for reference.
Click on Import
In this class we will Import thesettings I want the class to use.
Assistants be sure you practice importing applicationoptions. Look in the MA13105-1L\MA105-1L Dataset folderfor filename MA105-1L Application Options.xml file. Whenwe get in the lab the first thing we will have to do isdetermine where they put our class files. We will also helpthe students set the MA105-1L.ipj project file as active*.
*See Addendum 1
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Becoming an Autodesk Inventor Professor in 90 Minutes
Sketching is the Foundation
In this class I will use the using the Base Orphan Reference Node ( BORN ) Technique.
o 8. Expand the Origin folderand RMB turn on thevisibility of the CenterPoint .
Use the origin geometry to youradvantage. It has no parents andcannot be deleted. It will always
be there for you. Use it to anchoryour work. Use it for symmetry.Use it for consistency. You donthave to have it visible to use it.Just Use it!
o 9. Create your first line, circle, rectangle orpolygon and dimension it immediately. Thiswill give you a sense of scale for the rest ofyou sketch. This step is particularly importantfor AutoCAD users new to Inventor who areused to using direct distance entry. As westart adding constraints your sketch could getvery difficult to control if it isnt to a relativescale. We can avoid perhaps the biggestfrustration for AutoCAD users right here.
o 10. If your origin is projected you should get a green coincident hardsnap to the origin centerpoint. If it is not projected it mightappear to snap, but this is really a soft snap that does not resultin a constraint.
Assistants we will skip ahead to #25, but make sure youunderstand #8-24. I will only make quick reference to theseas basic techniques that everyone should know.
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o 11. After adding a dimension the sketchline changes color indicating a fullyconstrained sketch (the actual colorchange depends on your background color scheme for printing this document Iused the white presentation background, but I would normally use the skybackground in a classroom). An implied coincident constraint was added when wesnapped to the projected origin center point and an implied horizontal constraint wasadded when we clicked the endpoint for the line tracking in a horizontal direction.
o 12. If you need to select the sketch or part of the sketch you can use a crossing windowor window selection.
o 13. I often use a vertical or horizontal line ofsymmetry. I create the line close to the originand then add a coincident constraint betweenthe midpoint of the line and the projected origin.
o 14. A rectangular shape is a common startingpoint for a model. One option is to simply startone corner of the rectangle at the projectedorigin. (From here on I will simply refer to theorigin it is assumed that you will ALWAYSproject it.)
o 15. Coming from an AutoCAD background I used to always use this method as Ifrequently create Rapid Prototype models from stl files. In AutoCAD if your modelisnt in the positive xyz octant you get errors trying to export the stl file. In Inventor this is not a problem. Inventor will place the geometry in the positive octant whensaving as a stl file. Tip: Inventor 2008 now allows you to save an assembly file to stl format. In previous releases you would have had to derive the assembly into a single part.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 16. Putting the corner of a rectangle at the origindoes not, however, make the best use of theorigin geometry for symmetry . Somemodelers apply horizontal and verticalconstraints between the midpoints and theorigin.
o 17. You could use bisecting constructionlines as a visual indication that cant bemissed later on if the sketch needs editing.(Remember back on the drawing boardwhen you were instructed to not eraseconstruction lines?)
o 18. Notice that I prefer to dimension from sideto side rather than single lines as thatmethod picks the endpoints which could beeasily lost in editing.
o 19. The problem with using midpoint coincidentconstraints is that they can shift.
o 20. Tip: Did you notice when I createdthe fillet I selected the corner insteadof two edges. Either way works forfillets and chamfers when there areonly two edges at the intersection.
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o 21. My favorite method of starting a basically rectangularshape is to use a diagonal construction lineconstrained at the midpoint.
o 22. Anytime you are not sure how a sketch will react,click and drag corners. Very Important Tip:This is the easiest way to figure out theremaining constraints or dimensions that are
needed to fully constrain a sketch. If you aretraining others make sure demonstrate this.
o 23. Many books and trainers emphasizeusing the Auto Dimension commandfor help in figuring out the remainingconstraints or dimensions that areneeded to fully constrain a sketch.However, I dont think this helps inunderstanding geometry. In r2008the information is also available atthe lower right hand corner of thescreen.
o 24. Sometimes implied constraints can be anuisance. What if I dont want this lineconstrained parallel, horizontal orperpendicular. You can override automaticplacement of constraints by holding the Ctrl key.
o 25. Here is an interesting tip.I cant create a line tothe midpoint of an arceven if I RMB andchoose the Midpointoption, but I can add acoincident constraint tothe midpoint.
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o 26. Tip: You can set up keys for shortcuts to commonly used sketch constraints. I like touse Num . (numerical keypad period) for Coincident, Num for Horizontal, Num + forPerpendicular, Num * for Tangent and Num / for Vertical. These work well as amnemonic (memory aide) because . is a point for coincident, - is horizontal, + istwo perpendicular lines, * reminds me of a circle and / is an almost vertical line.
Notice that we can Export and Import these preferences. Unfortunately these preferences areslow to load.
There are many pre-defined shortcuts, for example X for Trim and once in the trim command ifyou hold Shift you can Extend .
Assistants we will set up these 2D sketch constraints.Tools>Customize>Keyboard tabMake sure you know how to change the Categories toSketch and practice changing the shortcuts.
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o 27. If I had left on the horizontal and vertical grid axisnotice that the Horizontal grid axis is thicker.
o 28. You can use the shortcut L to create a Line and an arc from a line endpoint by clickdragging from the endpoint while in the line command.
o 29. Use the shortcut D to start the Dimension command. If you dimension to a centerlinetype you will get a diameter dimension.
o 30. You can make one dimensiondependant on another dimension bysimply clicking on the sourcedimension while editing thedependant dimension.
Assistants I will comment only no student action onthese.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 31. Use List Parameters and set dimensions topredefined variables.
You can use units (in, mm) PI and functions informulas. Your formula is not lost afteraccepting.
o 32. If you leave Autoproject for sketch creationturned on you can get unnecessarily complexsketches.
o 33 . Dont forget the 3-pointrectangle tool . It can come invery handy. The lines arecreated with perpendicularconstraints. If there are otherautoconstraints that you dontwant, simply hold the Ctrl keywhile sketching .
o 34. When offsetting an ellipse you will getdifferent results depending on whetherone of the axis is highlighted or not.
Assistants I will comment only no student action onthese.
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o 35. RMB to get additional options when Offset.
o 36. If you have Loop Select turned off you will haveto RMB Continue to offset a circle or ellipse.Watch out for this one.
o 37. Autoproject edges can cause difficultyin selecting text sketches, but you canuse the Select Other tool to get the
text.
o 38. Often you will want to create text sketchon an offset workplane. A workplanehas a front side and a back side. Thebackside is a darker color. Notice thatthe text is placed right-reading on thefront side.
Assistants I will comment only no student action onthese.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 39. You can Flip Normal (thevector perpendicular to thefront side of the workplane)by RMB on the plane.
o 40. Whenever you place sketch text youshould immediately dimension the textbox. (The actual dimension values dontmatter).
o 41. You can then grab and drag the lowerleft corner to roughly reorient and thenconstrain just like any other sketchgeometry.
o 42. A Projected Loop is created byselecting a face with the ProjectGeometry tool rather than selectingindividual edges. I wouldrecommend not using projectedloops. For example, you cant copy a feature created with a Projected Loop. If youare a trainer this is the kind of thing that will drive you crazy in a class of 25 peoplewhere some have projected the edge and some projected the loop.
Assistants I will comment only no student action onthese.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 43. When patterning cut features you may get unexpected results where an expectedmaterial cut is not made.
o 44. The trick to getting all of the slots inthis model is to expand the PatternFeature dialog box and Adjust tomodel.
o 45. You can create a 2D sketch by ProjectCut Edges where an inclined workplaneintersects a conic feature.
o 46. Or create a similar 3D sketchusing the 3D intersection betweenan inclined workplane and a conicfeature.
Assistants Open file number 45. Thepart might be in a rolled up state*.
See Addendum 2
Assistants after pulling down the EOP it
might be necessary to Zoom All to see thepart. This will probably get a few people.
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o 47. Now I Sweep two circlesalong the 2D and 3Dintersection paths.
o 48. I have changed the 60dimension to 50 andUpdated the part. Noticethat both sweep featuresupdated properly inInventor 2008. Inprevious releases thefeature created with theProjected Cut Edgeswould not have updatedproperly.
o 49. You can change featureparameters simply bydouble clicking on thefeature in the browser.The behavior has changedslightly in r2008. (Inprevious releases the
sketch as well as thefeature parameters wouldappear.)
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50. Sometimes when you open a part it isnot oriented at the best viewing angle.Start the Rotate view command and hitthe Spacebar and a common viewglass box appears. Select the arrow forthe view you want.
o 51. While the Common Views glass box isvisible RMB and select Redefine Isometric .
o 52. You can rotate the view of the model 90 at atime by clicking on one of the edges of theglass box. The icon next to the cursorindicates which way it will rotate.
o 53. You can get back to free rotate by hitting theSpacebar again. You can center the Rotateview with a long click. Leave Rotate commandby moving the cursor out of the arcball asshown and clicking in the graphics window orby hitting Esc.
Assistants if we have Spaceballs I will also explainhow to navigate with them.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 54. The Rectangular Pattern tool can be used for more than just rectangular patterns.
o 55. The most common problem experienced by those who know this feature is somehowpossible , but they cant get it to work right is that their pattern is shifted and they
forget that they can choose a new start point.
Assistants open file #56.Drag the EOP above Rectangular Pattern1 if I have italready done. We will recreate the pattern adjustingsettings per steps #55-57.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 56. The second most common problem is thatthey forget how to reorient the pattern ifneeded. (Perhaps because the option situated under the Direction 2 area of the dialog box. Direction 2 is of course for a rectangular pattern.) The RectangularPattern now has a midplane option.
o 57. The second most commonproblem is that they forget how toreorient the pattern if needed.
(Perhaps because the option situated under the Direction 2 area of the dialog box. Direction 2 is of course for a rectangular pattern.) The RectangularPattern now has a midplaneoption.
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 58. The Coil command in Inventor 11 now allowscreation of a surface. The edge of the coilsurface can be used for a pattern curve.
o 59. Many people associate surfacemodeling with complex shapes,but they can also be used in thecreation of fairly simplegeometry. In this case a surfacewas used to create a sheetmetal part that otherwise wouldhave taken quite a bit more workto create.
o 60. Just as you can goback and forthbetween the Modelingand Sheet Metalenvironments and usePart Features tocreate sheet metalparts, you can alsouse Sheet MetalFeatures to createstandard parts.
Assistants no student action on #58-60.
Assistants I made a changeafter the files were submitted
and now these have thewrong file numbers. #61
Assistants I made a changeafter the files were submittedand now these have thewrong file numbers. #62
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o 61. If you start working with surfaces be sure you understand when you have a surfaceand when you have a solid. (A surface feature will be translucent or a surface created
from a solid by the DeleteFace tool will show at the topof the browser as a surfaceicon. If you use the DeleteFace tool solid options willbe disabled until you stitchyour surfaces back to asolid.)
o 62. A hole in a surfacemodel can be patched withthe Boundary Patch tool.
o 63. Lets put some of what weve learned to use . Create the sketch shown and Extrude2 inches going down.
RGB=XYZ
Assistants I made a changeafter the files were submittedand now these have thewrong file numbers. #63
Assistants no student action on #61-62.
Assistants the majority ofthe hands on class time willbe creating this Muffin Panfrom scratch.
Addendum 3
Assistants make sure you knowhow to Offset the .25 and how to
create the .25 circle sketch.
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o 64. Create the sketched circle dimensioned as shown and Extrude Cut 1.375 with aTaper of -10.
o 65. Add a .125 fillet at the top edge and a .0625 fillet at the bottom edge of the ExtrudeCut.
Assistants some are likely to have trouble with thetaper. Set on the More tab of the dialog box.
Assistants I left out the creation of the .25 circle sketch and a Sweep of the
circle. This will likely cause problems for some people as I demonstrate.
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o 66. Create a Rectangular Pattern of the Extrude and Fillet features..
o 67. Next weuse DerivedComponentsto createCore and Cavity tooling.
Assistants 4ul x 2.375in and3ul x 2.375in. It is notnecessary to enter the ul, butsome might make mistakeshere like putting it in caps ULor units.
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o 68. Perhaps one of the most underutilized feature options is the Intersect optionavailable with many part feature tools. ( Polygons must have a vertical or horizontal constraint to be fully constrained. Creating the tangent circle is an excellent use of the RMB Autoproject option. )
o 69. Check out theThicken/Offset with theCut option too.
o 70. Change the Thicken option to Intersection and we have our mating part.
Assistants no student action on this page.
Assistants part # 71 & 72
Assistants part # 70
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Becoming an Autodesk Inventor Professor in 90 Minutes
o 71. And be sure to check out the new Face Fillet option.
o 72. Combine the RectanglePattern, Thicken withintersection options andsome of the other tricks wehave learned and you cancreate some fairly complexgeometry. We might have todelve into Loft, SculptTrim/Extend Surface andsome of the other advancedtools, but that is anotherclass.
Assistants no student action on this page.
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2D is Gravy
Traditional detailed 2D orthographic projections are almost an afterthought when created from3D models.
o 73. If the base view comes inat an orientation thatdoesnt fit well aestheticallyit is easy to Rotate the
initial Base View.
o 74. Here is a trick that will save you a lot of time in removing unnecessary hidden lines.
o 75. Use a window to select theunwanted hidden lines and RMBturn off the Visibility.
Assistants open part #75.iptto use to create idw views.
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o 76. Simplify a section view by setting the Section Depth.
o 77. To speed up the view creation bitmaps are used by default for shaded views. Formaximum image resolution on-screen go to Tools>Document Settings>Drawing tab and set Offline Only for shaded images.
If you have any questions be sure to catch me during breakfast, lunch or supper at AU or sendme a email when you get back home.
Enjoy AU!
Assistants create shaded isometric view and zoom in.
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Addendum 1
If you are not familiar with changing projectwe will go to File>Projects
And click Browse
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and find the ipj file
and then make it the active Project.
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Addendum 2
The part might open in a rolled up state with some or all features below the End of Part (EOP)marker. In any case I want the students to move the EOP to just below the RectangularPattern. Also note the location of the Part Feature Panel Bar.
I will ask everyone to set up their screen to look like mine. Some mightaccidently close the Panel Bar or Browser. You should do this yourself
to practice getting it back. Under View>Toolbar menu or RMB (rightmouse button) on any button along top of the screen.
We will then do #44 toadjust pattern to model.
The rest of the part isalready done for theaudience I will do someexplanation and then havethem Double Click on the50 dimension and changeto 60 then Update.
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Addendum 3
Start a new Inch part file and create thesketch.
Make sure they do not use constructionlinetype for the fillets.
Offset to theinside andadd the .25dimension.
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Start a new sketchon the XZ Plane.
Project Geometry the line as a point on the sketch.
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Create the circle shown.
Extrude 2 selecting both the inner and outer loops of Sketch1. Notice the extrude direction.
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Extrude Cut
with Taper.
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Fillet the cup edges.
The students might not know how to Click to add to add multiple fillet sizes to one feature orhow to click on the edit pencil after changing the fillet radius to get back to the edge selectiontool.
All kinds ofthings couldgo wrong here
Ill goslowly.
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Watch the Shell thickness.
Redefine Isometric.
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Start a new Inch part file and exit sketch mode. Click Derived Component and select the MuffinPan. Change to Body as Work Surface. A warning box will pop up accept the warning.
Offset XY Plane 2 some might not realize that you have to click the edge of a workplane toselect the plane.
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Save the file as Core.
Then File Save Copy As with the name Cavity.
Turn off the visibility of the Derived Work Body. Color as desired.
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Double clickon the offsetWorkplane1 inthe browserand changethe offsetdistance tonegative 2.Click Updateand Acceptthe error.
RMB on the Extrusion in the browser and selectRecover.
Next, Next, Finish in the Design Doctor and select theTerminator selection tool in the Extrude dialog box andreselect the work surfaces.
Explain why this part isnt the same as the
Muffin Pan before we Shelled.
Then turn off the visibility of the derivedwork surfaces.
