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Fix those Assembly Constraints!

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One of the more difficult challenges in large assembly modeling is keeping track of which constraints are doing what.  This typically results in failed or conflicting constraints.  Inventor 2011 has a new constraint failure analysis tool that can help you figure out the correct solution.  Just follow the steps below or watch a video of the tool in action HERE.

1. Notice the failed mate constraint in the model browser.

2. Right click the failed constraint and pick “Diagnose”.

3. Use the tool to break constraints and check the results.

Constraint Limits – New in Inventor 2011

One of the neatest new features in Inventor 2011 that is extremely easy to start using is Constraint Limits.  This is actually an addition to the existing assembly constraint functionality that can really add a lot of intelligence to mechanistic designs.  Want to control the range of motion in an assembly?  Store a default “home” position for your assembly?  Click and drag parts without changing settings to do so?  If so you were not alone.  By simply adding a couple of extra numbers into a constraint, you can now define the range that a constraint is allowed to travel.

Check out a video example HERE

Constraint Limits in 2011 assembly constraints

Inventor UCS, Use Constraint Sets


This feature was new to Inventor 2010 and with the next release on the way, I wanted to get this one in our blog. User Coordinate Systems in Inventor. I have found many interesting ways to implement this for customers over the year. In a single part you can use this to locate a new 0X,0Y,0Z, or just locate a specific connection point. Then in the assembly this works great for constraining parts together based on that known point instead of using three or more assembly constraints. This can be done easily using the Constraint Set constraint in the assembly environment. It allows you to quickly put components together based on mating UCS axis, and planes in a few clicks.

Added By Rodney, another one of those CAD Geeks.

Parametric Design in AutoCAD Part 2: Dimensional Constraints


After the shape of your design is controled by geometric constraints then it’s size will be defined. dimensional constraints are very similar to the normal AutoCAD dimensions that you are familiar with.

The big difference is dimensional constraints control the geometry but the geometry controls the normal AutoCAD dimensions.
Always remember to define the shape and then the size!


Check back for Part 3: Dynamic, Reference, & Annotation Dimensions

Blogged by Josh Hunt, Yet another CAD Geek

Parametric Design in AutoCAD Part 1: Geometric Constraints


It’s not a new idea but it sure is new to AutoCAD. The same 2D sketch constraints that have been available in Autodesk Inventor are now in AutoCAD. I’ll show you how to get your feet wet with parametric design.
Geometric constraints create relationships between lines, splines, and arcs that maintain the shape of your design. Instead of me trying to explain this, just take a look.
Check back for Part 2: Dimensional Constraints
Blogged by Josh Hunt, Yet another CAD Geek
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