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Pro/Engineer   June 2004   Tip-of-the-Month

Interference Checks, an Under-Used Power Tool

Interference Analysis
Figure 1.  Interference Check Graphic Result
One under-used analysis TYPE available at Analysis > Model Analysis (dialog box) is Pairs Clearance.  The title is perhaps a bit misleading as it does more than that.

Typically this is used to determine the clearance (shortest distance) between two components in an assembly.  It can also show interference (including the volume of interference) if the components happen to occupy the same space.  It can also tell clearance between entities, or more practically, the clearance between one component and an entity or surface of another.

For example, if a Pairs Clearance analysis is done for two parts that do not touch, the Results show the shortest distance between them.  If the two selected components interfere, the Results will show something like Figure 2, and the display will show (in red) the volume of interference as in Figure 1.

Interference Check
Figure 2.  Interference Check Data Result
Note:  Volume and Distance values are given in the assembly units, even if the components are constructed with something different.

A cool thing is you can rotate and/or zoom the model to the area of interference to visualize where the interference occurs.  The interference remains highlighted while the dialog box is open.

For more detailed analysis, each Definition (labeled From and To) has a pull down select that allows more detail.  Figure 3 shows the pull-down list (options) for Assembly Mode.  By using these options, you can measure distance between a component (Whole Part) and portions of another -- like a Surface or an edge (Single Entity).

Analysis Options
Figure 3.
Another cool thing is the ability to select a sub-assembly (Whole Subasm) so you do not have to select multiple components for evaluation.

There are many other options to choose using the Model Analysis dialog box.  Try them and see what you get.  This can be a very educational, and a great way to get information you might need.

For quick access to this functionality, create a mapkey or two that get right to the analysis by choosing the appropriate TYPE, From and To menu options.

Note:  If this tip seems a bit elementary, congratulations, we are glad you already know.  The tip comes from questions and observations of beginning users.


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