Week 9 - Attachment Feature Creation - Challenge 2

SCREW BOSS DESIGN

Screw boss for M8 screw

Iso-constrained Sketch

Tree structure of sketches, features and operations

Dimensions for Screw Boss

For M8 screw, Internal diameter is taken as 7 mm.

Outer diamter = I.D. + [2 x (0.6 x T)]

=> 7 + [2 x (0.6 x 2.5)]

=> 7 + [2 x 1.5] => 7 + 3 =10 mm

So, Outer diameter = 10 mm

For Height, 3:1 ratio of height to diameter was taken = 30 mm

Draft angle = 0.5 degrees on outer and inner walls.

Fillet radius = 0.25 mm

Dimensions for Ribs

T= thickness = 0.4 x t (t= thickness of component)

=> 0.4 x 2.5 mm = 1 mm

Fillet radius = 0.25 mm

Draft angle = 0.5 degrees

Rib height = 5 x 2.5 = 12.5 mm

Rib width at top = 0.786 mm

Root thickness width/diameter = 2.686 mm (not more than 30% deviation in thickness)

Draft analysis

Most faces have draft angle of 0.5 degrees, thats why Screw boss faces are red.

DOG HOUSE

Dog house in various orientations

Tree structure of Dog house

Iso-constrained sketches

Dimensions of Dog House

Draft per side = 1.5 degrees

Thickness = 2.5 mm

Width at the top = 23.8 mm (After draft of 1.5 degree per side)

Height = 12.49 mm (After draft of 1.5 degree per side)

(2:1 of Width to height ratio was opted)

C = 0.783 mm & B = 3.991 mm

Draft analysis done 2.9 degree draft angle along main tooling axis

Draft analysis done 0.45 degree draft angle along side core tooling axis and all faces having 0.5 degrees are clear through the side core tooling axis of the Dog house.