Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1
Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1
Aim:To create B side feature Ribs and Screw Boss for given Drill Handle Class A Surface by considering Design Rules.
DESIGN RULE FOR RIB
DESIGN RULE FOR SCREW BOSS
General Guidelines for Bosses:
- Draft - 0.5 degrees on the walls of boss
- Thickness - Typically 40%* of the nominal wall at the base.
- Height to Diameter Ratio - 3:1
- Radii - 0.25mm maximum radii.
CLASS A SURFACE
Checking Gaps In given A Surface
TOOLING AXIS CREATION
For creating tooling axis we have to choose correct direction where the given surface can be ejected and also considering the draft angle.
Extract
POINT
LINE THROUGH POINT
LINE 1
INTERSECTION
Create Axis System on Point
create intersection as shown in fig
Create lines
LINE 02
By using Bisecting create line 2
TOOLING AXIS
Bisecting LINE 01 AND LINE 02 tooling Axis is created
DRAFT ANALYSIS
CLASS B SURFACE
OFFSET
BROKEN SURFACE
EXTRACT---> FILL
JOIN (CLASS B SURFACE)
CLASS C SURFACE
JOIN
Join all Sweeps
CLOSED SURFACE
TRIM
Trim is done to Class C to Class B Surface
after triming join to Class A
JOIN
CLOSED SURFACE PART
CREATING B SIDE FEATURES
RIBS
SKETCHES
EXTRUDE
SPLIT
Extruded surface is Slipt With Respect to Class A Surface as shown in below surface fig
RIB Thickness as 1mm
By Considering Design Rule
i.e. 0.4 * t
wher t = Part Thickness=2.5
0.4*2.5=1mm
i given thickness on both sides 0.5mm.
By using Boolean Operation i.e assemble the ribs are added to main part body
DRAFT
Draft is given as 0.5deg
FINAL RIB
SCREW BOSS
SKETCHES
For creating screw boss design rules are followed
here wall hole dia is taken as 3mm and wall thickness taken as dia 6mm
because the nominal wall thickness is given as 1.5mm
i.e w=0.6*t
=0.6*2.5
w=1.5 since it is circle we have to double the value finally we get 3+3=6mm for outer dia
PAD
here also Height to Diameter ration is taken in to consideration
i.e H/B<3
`H/B=3`
Where B is dia of Hole
H is height of screw boss
`H=B*3`
H=3*3
H=9mm
Measuring Distance
Draft
draft=.5 deg
Ribs to Screw Boss for Sriffness
Fillet Radius
FINAL PART
DRAFT ANALYSIS
PUBLICATIONS
VIEWS
ISO VIEW
BOTTOM VIEW
FRONT VIEW
TOP VIEW
TREE STRUCTURE
DETAILED TREE STRUCTURE
CONCLUSION
B side features are created for given Class A Surface