Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)

AIM : To Create the rib and the Screw boss for the Drill Handle for the Drill Handle considering the design rules 

 Tooling Axis creation :

TOOLING AXIS is created by bisecting the lines created on intersection curve  between Class A surface and any suitable Plane or Axis System using " Bisecting " Method . Tooling Axis can also be Created by checking Direction Visuallly .

 The best tooling direction for the class-A surface is along Y-axis direction.

Extract the Flat surface on the centre part of the Class A surface for creating the Tooling axis in Y-direction 

Then created a point on the Extract created 

Now Create the Line using " Point-direction "  along Y-axis which is the required Tooling Axis Direction .

Draft Analysis Report :

• Go to INSERT-------> ANALYSIS----->FEATURE DRAFT ANALYSIS .
• Place the compass on the Tooling Axis and then click on the component .

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 Design of ribs for Drill Handle following the design rules

First Create the Sketch for two Ribs with a certain distance between them according to the design rules 

 

Now Extrude them to a length of 12.5mm up and 1mm down to make sure that rib is attached to the Final component of Door Handle

Height  <=5t (thickness of part)

 

use "Split " Command to obtain proper surface for the ribs

 

Now thicken the surface using thicken surface by thickness = 0.4t (thickness of part) =1 mm

 

•  Draft the all sides on the Ribs to 0.5degree with neutral element as Base (extract) and the pulling direction as Tooling Axis

 

•  Make sure that the thickness of top edge of the Rib should be atleast 0.75mm thick.
• Provide Fillet Radius of 0.25mm either to edges or Faces of the Ribs .

 

•  Now Add it to Main component using Boolean Opeartion "Assemble ".

 Rib root thickness analysis :

•  Take the Intersection between the Final Main Component and the Plane( create the plane accrdingly which intersects the both ribs )as shown

• Now create a circle using "Tritangent " and select the 2 fillets on either sides of the ribs  by extracting them on either sides of the ribs and the base of the Rib by extracting it .
• Thus the "Hexagonal shaped circle " is obtained . 
• In order to improve the Hexagonal circle into perfect circle , Go to Tools--->Options--->performance--->3D accuracy--->proportion=0.01 . Now it has improved as shown .

 

• Now use "Measure item " Command  . Repeat it for other Rib .

 

Ribs should be spaced as per design rules :

2)Design of Screw Boss for Drill Handle following the design rules  

• 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.  

 

•  create the sketch for two screw boss as shown  

 

•  Draft the screw boss to 0.5 degree to inner and outer walls 

 

•  Provide Fillets radius at the faces of screw boss as shown

 

 Draft analysis on the Final Component