Week 9 - Attachment Feature Creation - Challenge 2

SCREW BOSS AND DOG HOUSE DESIGN ON COIN HOLDER:-

AIM:- Create the screw boss and dog house for the centre console coin holder considering the design rules mentioned in the video.

General Rules for Screw Bosses:-

1. Draft of 5 deg on walls of boss.

2. Thickness is 40% of normal wall at the base.

3. Height to diameter ratio - 3:1.

4. Fillet radius of max 0.25mm.

C is where the doghouse contacts the back side of 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 3-6mm.

DOG HOUSE DESIGN:-

Extract the base of class A surface and offset it with part thickness as 2.5mm.

Draw the sketch of rectangle and should be open from one side for dog house.

Using sweep with tooling direction and draft it at an angle of 1.5 deg for outer surface.

Close the upper surface face by offsetting the below extracted surface and then after trimmed it.

Convert the dog house surface in thickened surface by applying part thickness as 2mm.

Now for the inside faces of dog house we need side core tooling axis created it in Z-direction.

Give draft to the inside surface of 0.5 deg.

Now to create B and C section as shown in design rules, offset the base surface in between 3 to 6mm.

Extrapolate the surface to achieve desired length.

Switch the part workbench and split the C and B section with thicken part.

Again provide draft to the inside surface as shown.

Give fillet to inside as 0.4*T = 0.4*2.5= 1mm and for outer edges give fillet as inside radius + part thickness.

And minimum fillet of 0.5mm.

Assemble with coin holder main body.

Draft analysis :-

Feature Tree:-