Week 9 - Attachment Feature Creation - Challenge 2

DESIGN OF SCREW BOSSES AND DOG HOUSE USING THE DESIGN RULES AND PERFORMING DRAFT ANALYSIS ON THE COMPONENT

1. DESIGN OF SCREW BOSSS

DESIGN RULES FOR SCREW BOSS

• the thickness of the boss 40% of the component thickness that is 40%2.5= 1mm
• then height to diameter ration is 3:1
• the draft for this is 0.5deg
• there are also ribs in the sides for the bosses to provid support and strength to the bosses
• the fillet nominal value is 0.25mm

APPLICATION OF DESIGN RULES FOR SCREW BOSS

• the wall thickness is first made 1mm i.e. 9.8-6.8 = 2 and 1mm on both sides

• the height for the boss can be maximum of height : dia = 3 and h = 3*dia(6.8) and h= max(20.4)

• further ribs are also created to provide the additional strength to the boss

• then the ribs are union trimmed to the screw boss which is then assembled to the coin holder
• the draft of 0.5 deg is given to the screw bosses and the support ribs

2. DESIGN OF DOG HOUSE

DESIGN RULES FOR DOG HOUSE

• the main design regarding the dog house is the c section as shown above and other features are desired
• the main purpose of the dog house is to create easeness of the attachment features according to the needs and direction
• the thickness of the c section should be max 40% of the component thickness
• the height of the c section should also be between 3 - 6 mm
• the c section purpose is to avoid the sink marks in the plastic components during molding

DESIGN RULE APPLICATION FOR DOG HOUSE

• first the dog house is creatred using the design rules and the inersection is made to ensure the design

• the c section is mesured

• finally a screw bose is also crearted above the dog house

DRAFT ANALYSIS OF THE SCREW BOSE AND DOG HOUSE

DOG HOUSE AND SCREW BOSS

MAIN TOOLING AXIS

DOG HOUSE SIDE TOOLING AXIS