Challenge

Week 9 - Attachment Feature Creation - Challenge 2

VVaibhavkumar Chonde31 Mar 2021

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 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

DOG HOUSE DESIGN:

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

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.

Give thickness in outer direction as 2.5mm or part thickness.

Now for the inside faces of dog house we need side core tooling axis, create 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 6mm.

Extrapolate the surface to achive 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 = 1 mm 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 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.