|This task shows you how to prepare a design part for manufacturing by automatically creating all recognizable prismatic machinable features.|
|The SampleMPA.CATPart document should be open.|
|1.||Select the Global Feature Recognition icon . The Global Feature Recognition dialog box appears.|
|2.||Set Selection Type to Body then select the part in the 3D view. The feature recognition takes the associated Body object into account.|
|3.||Select all the Feature checkboxes so that the
part will be analyzed for all machinable feature types.
|4.||Click OK to start the feature
recognition process. This process can be interrupted by means of the
Cancel button on the progress bar that is displayed. See
Interrupt Behaviour for more information.
All recognized machinable features are added to the Manufacturing View.
Selection Type can be set to Face. In this case, all
recognized features that open onto selected faces will created.
However, suppose a pocket has a child pocket and the top face of upper pocket is selected.
The child pocket will not be created as it does not open directly onto the selected face.
Graphic and Text Feedback about Machinable Features
Machining direction of a recognized
through feature can be reversed by right clicking that feature in
Manufacturing View and selecting the Reverse Machining Direction
contextual command. This command is not available for the blind features,
as they can be machined in only one direction.
The identifier of the Machinable Axial Feature is shown as follows:
MyFeature.1 (Simple Hole Diameter=12mm Depth=20mm)
Both the graphical representation and the feature in the Manufacturing View are associative and always up-to-date, positioned and filled according to design changes. When geometry can no longer be retrieved from a feature (referenced RSURs are no longer in Design Part, for example) no user representation is displayed.
The Advanced tab page of the Global Feature Recognition dialog box contains a number of parameters for specific processing.
You can specify a machining direction by selecting a face, a line or an edge. Created features will then have a machining axis parallel to the selected direction.
By specifying a machining direction, you can choose to create features that open in that direction only. For example, this may correspond to the machining direction of a particular machine setup.
If no machining direction is selected, the Create features only in this direction checkbox cannot be selected.
Depending on the value assigned for the maximum hole diameter, you can choose to create:
Using this capability:
Make sure you have selected the appropriate Feature type in the Basic tab page (for example, if you want to recognize a hole as a pocket, select the Hole and Complex Pocket checkboxes or just the Complex Pocket checkbox).
The behavior can be illustrated by means of the following example.
Consider a selected face with 4 holes with 10mm diameter and 4 holes with 20mm diameter.
Basic tab: Hole to be recognized
Ignore Tapered Hole Component
You can choose to ignore the fact that the hole type is tapered during feature recognition. In this way, you can force chamfered holes to be recognized as simple holes.
Selection of Bodies
One or more Bodies can be selected.
For feature recognition, the In-Work object must be either a Body or the last component of a Body. For example, in the figures below:
|The identifier of the In-Work object is underlined in the tree.|
Three types of message appear on progress bar depending on the step in which the recognition process is running:
The behaviour when you click the Cancel button to interrupt the process depends on the step in progress:
Pre-processing: If you cancel the process during pre-processing
before the actual feature recognition, there will not be any recognized
Creating Features: A message indicates that the Creation step was
Pattern Creation behavior:
In the Part Design workbench, the Create Technological Results contextual command on a part body creates a Technological Results node containing technological information in the specification tree.
This technological information (thread, minimum and maximum tolerances) can be retrieved when creating axial features and machining patterns.
When Technological Results exist on the body selected for feature
recognition, technological information (thread, minimum and maximum
tolerances) are retrieved in both Local and Global Feature recognition.
Information can be retrieved only when Multi-Model Link (MML) documents are loaded. This allows creating machining features using propagated Technological Results attached to multi-model geometry without needing to load the original documents.
This capability also allows creating axial machining features on propagated Technological Results attached to transformed (translated, rotated, mirrored, patterned, and so on) Part Design Hole and Thread features.
If no Technological Results exist, technological information (thread, tolerances) is retrieved from the design hole.
Automatic pattern creation groups axial machinable features using technological criteria (thread, tolerance). Technological information set on the machining axial feature is used to create the pattern.
Technological Results capability does not take into account semantic
tolerances (H7, for example). Any semantic tolerances are retrieved from
design holes even if Technological Results have been generated.