Week 9 - Attachment Feature Creation - Challenge 2
OBJECTIVE - To create the attachment features screw boss and dog house on the coin holder using the given design rules.
PROCEDURE -
1)TOOLING AXIS :
The tool axis is the parameter which decides whether the tool enters into mould or not as as it denotes the draft clearance angle
where a moulded part is easily removed from the mould.
2)CREATION OF TOOL AXIS :
Firstly we will be given with a class A surface which is looked as a asthetic and a smooth finish which is created with a Alias
software workbench which is also known as a free imagination surface.
For that class A surface we need to check a boundaries first to check any unattached faces is present in that surface.
So next we need to take a dummy tool axis to get a real tool axis.
Next we take inclined lines to the surfaces we assume that draft is required.
Then we intersect the both the lines and the bisecting line will be the tooling axis.
Below is the image of the tooling axis.
So in this model the main tooling axis is taken in the direction normal to base as there is a shell in that direction and that shell is
cleared with draft in that particular direction.
3)DRAFT ANALYSIS PROCEDURE -
Here in the above image the green shows the draft clear area and the blue area shos the zero draft angle because this surface is
parallel to the tooling axis and the draft can be created on this surface by the class A surface designer.
So now here after the solid model is created we have to design screw boss and dog house on the surface where it is preferred
according to the design rules.
4)DESIGN OF SCREW BOSS AND DOGHOUSE -
SCREW BOSS -
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.
First we have to choose the B-side area to design the screw boss where ever it is needed with the assigned design rules for
screw boss.
DOG HOUSE DESIGN -
Doghouse wall thickness at the intersection of the part wall ( C ) should be 40% or less than the main wall stock ( T ).
Height of ( B ) should be between 3.0 – 6.0 mm
So to create a dog house we need to perform multiple operations like extrude, offset, trim operations and thickening method to
create the dog house.
So after creating the dog house we need to translate the screw boss to the top of the dog house and attach to the dog house.
Tree Structure:
Final result:
