Attachment Feature Creation - 2

AIM

To create a coin holder with Dog house, ribs and screw bose and to perform draft analysis.

THEORY

Screw bose and dog house design

SCREW BOSE

Scew bose attachment is used for holding the screw with the model or locating the fixing position of the screws.

Design guidelines for screw bosses.

Draft - 0.5 deg on walls of boss

Thickness- typically 40% of the nominalwall at the base.

Height to diameter ratio - 3:1

Radii - 0.25mm

DOG HOUSE

Dog houses are used to prevent the defects like shrinkage and breakages also it act as a guide.

Design guidelines for Dog house

Dog House wall thickness at the intersection of the part wall ( c )should be 40% or less than the main wall stok ( T ).

Height of (B) should be between 3.0 - 6.0 mm

Procedure.

Step 1

Import the coin holder model into the CATIA workbench.

Step 2

Create a tooling axis which represents the direction of the part.

Step 3

Extract base of the coin holder model and create ribs on the extract , give appropriate thickness, fillets and add it to the part body od coin holder

Step 4

Create a screw boss on the same base surface which was created before with proper sketches then give fillets. Make sure to follow the design rules and add it to the main part body.

Step 5

Create a Dog house on the extract surface with proper height with a sweep tool. Add proper thickness , fillets and draft then add it to the main body

DRAFT ANALYSIS ON DOG HOUSE