Week 9 - Attachment Feature Creation - Challenge 2
Create the boss and Dog House for the Centre console coin holder considering the design rules
- Sketches showing screw bosses and doghouse using position sketch,Iso-constrained
- Tree Structure having geometrical set as "INPUT"
- Screenshots of the completed design in various orientations (Isometric, Front, Side, and Top View)
- Report
- A detailed report should be done explaining the draft analysis and the tooling axis creation.
- An explanation should be given on the way of creating the tooling axis particularly the Bisecting method.
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.
The screw boss is an engineering feature which holds another feature to class B Surface and ribs are provided for extra strength and rigidity.
- T :It should be 40% or less compared to main wall stock
- C :The contact backside of B Surface and wall thickness of doghouse at intersection of part wall
- B : Height should be between 3.0 mm to 6.0 mm
- Main Width:12mm
- Minimum draft:1.5 mm
- Width to height ratio:2.1 (prefered) and 3:1 (for steel)
DOGHOUSE is a feature to avoid sink marks and its a primary function too.It is used if we need an engineering feature away from B Surface and to solve the length issue and if the screw boss is perpendicular to the surface.Since the doghouse needs to be drafted we use sweap option while creating the component.Fillets and draft angle is given as per design rules mentioned above.
- SPLIT option used to create the "C" part on the part body for the doghouse
DRAFT ANALYSIS:The coin holder component,outer face of dog house and inner screw boss is cleared with the help of TOOLING AXIS along Z Axis,The outer screw boss and the inner faces of dog house is cleared by creating a separate tooling axis perpendicular to the component that is along Y Axis.
- DRAFT ANGLE is 0.5 deg and to clear the component as the draft is applied,0.49 deg is given during draft analysis.
NOTE:The CATpart file is submitted below in ZIP file format
THANK YOU