Over the past couple of months, we published a series of articles related to Modelling Methodology in CATIA V5.
The presented articles discuss the entire process for parts that are mainly prismatic in shape, with single body.
Multi-body and surface based modelling will be covered in future articles.
To recap, the topics and articles links are below:
In this article, we will discuss additional rules to be considered when defining part files. This article closes the main set of modelling methodology for prismatic geometry driven parts, with single body.
This is the sixth article of a series concerning how to implement and use modelling methodology in CATIA V5.
The modelling stage
This is the fifth article of a series concerning how to implement and use modelling methodology in CATIA V5.
In this article, we will discuss the modelling stage in detail.
This is the second stage of the creation process; we already have all the elements defined in the Skeleton group, so now is the time to start modelling the solid geometry.
This is the fourth article of a series concerning how to implement and use modelling methodology in CATIA V5.
In this article, we will discuss methodology and rules for sketch definition.
|Figure 1 - The skeleton geometrical set|
We will continue using the same Angle bracket example part, introduced in previous articles.
In previous articles, we have discussed the skeleton and its internal structure and organization. The subsets are numbered so that the order of the subsets coincides with the order of element insertion, thus we can work sequentially inside the skeleton.
By this point, to start our article, we will consider that we have imported all necessary external data into our part and created all the necessary reference geometry.
All these elements are to be inserted in geometrical sets:
1. Input data and 2. Reference geometry.
As visible in figure-1, sketches are to be inserted inside geometrical sets:
3. Main sketches and 4. Auxiliary sketches, both inside the Skeleton.
The Design Phase
In this article, we will discuss the design stage in detail.
This is the first stage of the creation process; we will create a geometrical set called Skeleton and we will insert additional geometrical sets inside it. The component’s design intent is captured in the Skeleton geometrical set. Skeleton methodology has been around for quite some time now and the idea is to have to model’s main geometrical elements editable from one single location in the part’s specification tree. This also means that we will have many elements inserted inside this geometrical set, so for this reason we will rename them and organize them according to a specific logic.
Figure 1 - The Angle Bracket part
Specification Tree Organization
In this article, we will discuss how to organize the specification tree in a part file during the creation process.
1. Avoid cryptic specification trees
In figure 1, you can compare the difference between; a part with an organized specification tree (left side) versus a part with mixed modelling specification tree (right side). Both files present the same end geometry, considering the initial parameters specified for the design.
Figure 1 - Organised specification tree vs mixed modelling versions of Angle Bracket part
Part creation process
This is the first article of a series concerning how to implement and use modelling methodology in CATIA V5.
In this article, we will cover the creation process for a part file. We will break it down in two stages; design stage and modelling stage.
Let us imagine you need to edit a part, changing some parameters in existing features, and that the geometry update process fails after modification. Models that fail after editing are brittle and they work fine if you do not edit them!