Week 9 - Attachment Feature Creation - Challenge 2

Attachment Feature Creation

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

General rules for screw bosses.

• Draft of 0.5 degrees on walls of the boss.
• Thickness is 40% of the nominal wall at the base.
• Height to diameter ratio 3:1
• Fillet radius of max 0.25 mm.

Dog House design:

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

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

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

Close the upper surface face by offsetting the below-extracted surface and then trimming it.

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

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

Give draft to the inside surface of 0.5 degrees.

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

Extrapolate the surface to achieve the desired length.

Switch to the part workbench and split the C and B sections with the thickening part.

Again, provide a draft to the inside surface.

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 filet of 0.5 mm.

Assemble with coin holder main body.

Screw boss design:

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

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

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

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

Give draft of 0.5 degrees with tooling axis.

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

Draft to a rib of 0.5 degrees.

Do union trim with screw boss.

Assemble to coin holder's main body.

Draft analysis:

RESULT:

Created the plastic design for the center console coin holder and screw boss and dog house and added thickness to it and generated the draft analysis on a solid surface for the final component.

ISOMETRIC VIEW

FRONT VIEW

SIDE VIEW

TOP VIEW