Week 9 - Attachment Feature Creation - Challenge 2

AIM : To create a Screw Boss and Dog House of a Centre console coin holder considering Design Rule :-

Given Centre console coin Holder

SCREW BOSS

• It is used in many part design for attachements and assembly.
• It helps to screw two different components.
• It exerts different types of forces - tension, compression, torsion, shear.
• Avoid the bosses that merge into sidewalls because they can form thick section that leads to sink.

Design rule of Screw Boss

• Draft angle = 0.5 degree
• Thickness = 40% of the nominal wallat the base

W = 0.6*t (t= thickness of material)

• Fillet Radius = 0.25mm
• Height to Diameter ratio = 3:1

Procedure

• create a position sketch
• Taking M6 screw - inner dia = 5.2mm, outer dia = 8.2mm

• Pad the sketch

• Apply the Fillets, having radius=0.25mm
• Draft angle = 0.5degree

• again, make the sketch and Extrude it

• Apply Fillet Radius = 0.25mm, Draft angle = 0.5degree

• Use Union Trim to remove the inside surface for getting Screw Boss design

Screw Boss

Similarly,

• create another Screw Boss by using Translation operation for designing Dog-House.

Dog House:-

Dog-House is the Engineering supporting feature used in Plastic Designing.

• It helps to avoid sink marks.
• It also provide enough strength to joinn different surface having large distance between them.

Designing Rule of Dog-House

• Dog-House wall thickness = 0.4*T (T=thickness of component)
• Height(B) = 3 to 6 mm
• steel Width/Height ratio = 3:1
• 'C' is where Doh-House contacts the backside of the surface.

Procedure

• create a point.
• Extract the base surface

• create a Positional sketch using the point.

• Exit the sketch and use Sweep operation
• Draft angle = 1.5 degree

• Offset the Untrim surface

• Trim the surfaces

• now, Goto Part Design and make the Solid surafce having thickness 2mm.

• for making proper Dog-House, Extract the base surface
• offset 4mm

• offset the ractangular shap surface 1mm inside solid profile to make a proper cut.

• Trim the surfaces

• Unhide the solid profile and split this surface in Part designing
• If getting Error then Extrapolate this surface

• Apply proper Edge Fillet, Draft Angle=0.5 degree along side core axis; on cut surface.

• Translate the Screw Boss design on the Top of Dog-House solid body.

• Rearrrange the Body and Assemble this Dog House on the Centre Console Coin Holder.

Tree Structures

Draft Analysis of Dog House

• create a side core axis
• Draft angle = 1.45degree

Different View

Front view, Back View

Left View, Right View

Top View

Isometric View