Challenge

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

AAswin Asok12 Jun 2022

DESIGN

AIM

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

Create the Screw boss for the Drill Handle considering the design rules.

THEORY

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.

PROCEDURE

CREATING TOOLING AXIS

Extracting base surface of class A surface using extract tool.

Creating a point on the center of extracted surface using point tool.

Tooling axis is created perpenticular to the surface line tool.

DRAFT ANALYSIS ON CLASS A SURFACE

To perform draft analysis on the model:- Go to menu bar > select insert > Analysis > Feature Draft Analysis. To give the draft direction, use the compass and align Z-axis of it with the tooling axis. Once it properly aligned, lock the draft direction. A red point shown in the screen, select Base Bracket and it will show us the current of the model. Then go to display tab on draft analysis and select show Colour scale option and it will show the draft value. Set the Draft value to 3 deg under the colour scale variant and press ok.

CLASS A SURFACE

CLASS B SURFACE CREATION

Class B surface is created by extracting the Class A surface, untrim the extracted surface then expolated the untrim surface after that the surface are offset to the distance 2.5 mm . After the this the trimmed with respect to class A surface and applying fillet to B surface.

CLASS C SURFACE CREATION

Multiple extract the edges of class A surface.

Extracted edges are sweeped using sweep tool with reference surface at an angle of 90 degree. The Class C surface is created

Trim the Class A,Class B and class C surface together to get final surface. Using close surface tool the final body is created.

RIB DESIGN

first we need to extract the base surface . Then create a point on the center of the base surface using point tool. A plane is created in that point parallel to ZX plane, A sketch is drawn as representing rib extrude the sketch to the required height and thicken it. Applydraft to the thicken face. Last split it with extracted surface then assembling it to the part body and edge fillets are applied.