Week 9 - Attachment Feature Creation - Challenge 2

AIM:

to create screw boss and dog house and perform draft analysis on it

procedure to create 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 dog house

• using sweep with tooling 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 trim it

• convert the dog house surface in the thickened surface by applying part thickness as 2mm
• now for the inside faces of dog house, we need a core tooling axis created in z-direction

• give the draft to the inside surface of 0.5 degree
• now offset the base surface in between 3mm to 6mm lets take 4 mm
• extrapolate the surface to achieve the desired length
• now switch to the part workbench and split the part
• again do draft to the inside surface

"C" is where the doghouse contacts the backside of the surface

• give radius /fillet to inside as 0.4*T=0.4*2.5= 1mm and for outer edge give fillet as inside radius = part thickness
• minimum fillet of 0.5 mm
• assemble with coin holder main body

DRAFT ANALYSIS

• PLACE THE COMPASS ON THE TOOLING AXIS ON THE Z DIRECTION
• LOCK THE COMPASS AND CLICK ON THE SURFACE OF THE DOG HOUSE

PROCEDURE:

• SCREW BOSS can be on B surface or on the dog house in this we will mount it on the doghouse
• draw a sketch with two concentric circles with dia 5mm inside and 8mm outer dia (5+0.6*2.5)

• extrude it and apply thickness to it

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

• apply necessary fillets
• create a plane that is parallel to xy plane
• assemble it to coin holder main body
• create an intersection of the body with the plane

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