Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1

Attachment Feature Creation (Ribs & Screw Boss)

Objective:

Create the rib for the Drill Handle considering the design rules mentioned.

Given Data:

General Guidelines for Bosses:

•   Draft  - 0.5 degrees on the walls of boss
•   Thickness -  Typically 40%* of the nominal wall at the base.
•   Height to Diameter Ratio -  3:1
•   Radii - 0.25mm maximum radii. 

Creation of Tooling Axis:

Making an intersection on the x-y plane.

Make 2 lines.

Create a bisecting line to get the Tooling Axis.

Checking the tooling axis by draft analysis.

Part Design:

The B surface is created by an offset value of 2.5 mm:

The C surface:

Rib:

Height 3:1, h = Wall thickness * 3 = 2.5*3 = 7.5 mm

Rib Wall Thickness, w = 0.4*t = 0.4*2.5 = 1 mm

Draft Angle = 0.5°

Fillet Radii = 0.625mm

Rib root thickness analysis:

Hence, the Rib satisfies the design requirements.

Screw Boss:

Height 3:1, h = Wall thickness * 3 = 2.5*3 = 7.5 mm

Screw Boss Wall Thickness, w = 0.6*t = 0.6*2.5 = 1.5 mm

Draft Angle = 0.5°

Fillet Radii = 0.625mm

Final:

Draft analysis:

The draft analysis is done to determine if the designed part is tool able or not. Here the tooling axis is 3°.

By using the compass option, drag and place it on the tooling axis. Click ok then check the result.

Conclusion:

The part has been designed as per the design requirements.