Challenge

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.

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

Dog house design-

Extract the base of Class A Surface and offset it with part thickness as 2.5 mm.

Draw 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 degree 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 thicknes as 2 mm.

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 degree.

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

Extrapolate the surface to achieve desired length.

Switch to part workbench and split the C and B Section with thicken part.

Again, provide draft to the inside surface as shown.

Give radius/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 0.5 mm.

Assemble with coin holder main body.

Draft analysis of Dog House

Screw boss design

Screw boss can be on B surface or it can be on dog house in this we are mounting it on dog house.

Draw circular sketch inside circle of dia 5mm and for outer circle wall should be 0.6*T on one side so outside dia = 2*(0.6*2.5)+5(inside dia)=8mm.

Pad it with main tooling direction considering height to dia ratio of 3:1

H = B*3 =5*3 = 15mm

Give draft of 0.5 degree with tooling axis.

Now to support the screw boss we need to give ribs for it.

Draft to ribs of 0.5 degree.

Do union trim with screw boss.

Assemble to coin holder main body.

Screw boss draft analysis

Final body analysis.

Design tree structure

Ship work like this
in your own course.