Week 9 - Attachment Feature Creation - Challenge 2

In this project we will create the boss and Dog House for the Centre console coin holder considering the design rules mentioned in the video. 

General Guidelines for Bosses:

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

"C" is where the doghouse contacts the backside of the surface

•  Doghouse wall thickness at the intersection of the part wall ( C ) should be 40% or less than the main wall stock ( T ). 

• Height of  ( B ) should be between 3.0 – 6.0 mm 

Fristly we will create screw boss so extract the back surface of the component then create a point on the surface. here we using the axis system for positioning sketch, with the help of sketch create a line which is called Tooling Axis.

With the help of sketch apply Extrude feature on the sketch and thicken. They are used to aid in the assembly of molded parts by providing a channel for a screw. after creating a boss applied draft angle on the wall of boss which is not more then 3 degree. but we consider 0.5 degree. and also applied edge fillete value 0.25mm.

whatever features we have applied till now check the geometry with the help of tritangent circle which is also play a important role for accuracy of dimension. 

For provide the supporter outside of the screw boss using same sketch but make sure it should be as construction geometry. applied thicken extrude, chamfer upto 3mm and fillet feature 0.25mm. used boolean operation as union trim with boss.

Now Creating the Doghouse on the bottom side of coin holder. Dog house is an engineering feature used in plastic trim design. Dog houses are used as supporting feature. Sometimes other engineering features like snaps; locators etc. are mounded on them to increase their strength. 

Create a point on extracted surface then use positioned sketch which is Iso-Constrained. then aplied sweep command with draft angle 0.5. use new part body for thicken surface. inside applied extracted command for surface and extrapolated then trim with extracted base surface. 

In the end translate the screw boss from starting point to above the doghouse with the help of coordinates points as shown in the figgers and check the analysis of draft angle.