# Defeature holes / chamfers / fillets of objects

## Introduction

The operation of Defeature holes / chamfers / fillets of an object allow to:

• Add matter in cylindrical holes whose diameters are smaller than a maximum diameter entered by the user
• Defeature Chamfer whose distances are smaller than a maximum distance entered by the user
• Defeature fillets whose radius are smaller than a maximum radius entered by the user

## Structure of defeature objects

The operation Defeature holes / chamfers / fillets of an object is described by:

• The name of the operation geometric (by default DEFEATURE_1)
• The object to defeature
• To defeature fillets:
• The desired maximum radius below which detected fillets are defeatured
• The maximum angle between supports of fillets (by default: 175°)
• To defeature chamfers:
• The desired maximum length below which detected chamfers are defeatured
• The maximum angle between supports of chamfer (by default: 105°)
• To defeature holes (only cylindrical) :
• The desired maximum diameter below which detected holes are defeatured
• An option of detection of spheres
• (Optional) List of faces to keep during the defeaturing

Each type (fillet, chamfer, hole) has a button which allows unfolding parameters to define an to apply during the defeaturing

## Examples

Here are some examples illustrated to show how the user values are taken into account.

Dialog box Before defeaturing After defeaturing

## Result

The application of a defeaturing of objects has as result:

• A geometric operation DEFEATURE_1. This geometric operation is a specific entity of the modeler that permits to ensure the cycle of life of the construction (creation - modification - deletion).
• A defeatured object
• The operation DEFEATURE_1 has been added in the list of geometric operations linked with the defeatured object.

## Possibilities for the user

The user have the following choice:

• The defeaturing of holes / chamfers / fillets of an object may be done in only one geometric operation
• or independently by achieving a defeaturing operation for each type to defeature

## Access

The different accesses of the geometric operation Defeature hole / fillet / chamfer of an object are:

• By menu: Correction&Simplification > Defeature hole / fillet / chamfer > New
• Par icon:

## Creation of defeature an object

The process of creation of a Defeature an object is presented in the table below.

Stage Description
1 Opening the dialog box Defeature hole/chamfer/fillet
2 Choice of name of the resulting geometric operation (by default: DEFEATURE_1)
3 Choice of object to defeature
4

Choice of parameters of defeaturing of fillets:

• Click on button Defeature fillets to unfold the options
• Click on the check-box Defeature fillets to active the options
• Choice of maximum radius beyond which the fillets will not be defeatured
• Choice of the maximum angle between supports (by default: 175°)
5

Choice of parameters of defeaturing of chamfers:

• Click on button Defeature chamfers to unfold the options
• Click on the check-box Defeature chamfers to activate the options
• Choice of maximum length beyond which the chamfer will not be defeatured
• Choice of the maximum angle between supports (by default:105°)
6

Choice of parameters of defeaturing of holes:

• Click on button Defeature holes to unfold the options
• Click on the check-box Defeature holes to activate the options
• Choice of maximum diameter beyond which the chamfer will not be defeatured
• Choice of taking into account the detection of spheres (yes or no, no by default)
7

Choice of faces to keep:

• Click on button List of faces to keep during the defeaturing to unfold the options
• Choice the list of faces to exclude
8 Validation by clicking on OK

## Limitations

Somes limitations :

• No preview available at the creation and at the modification
• Applicable only on one object: repeat the operation on each object to defeature
• No cylindrical holes are not detectable, so no defeaturing possible (section square, rectangular, oval…)