Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)

WEEK 10 - CHALLENGE 1

AIM - Create the Screw boss for the Drill Handle considering the design rules.

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.
  

REPORT

• Class A surface is given as CATpart and .stp file along with the question.Draft analysis of Class A surface has been done.
• Created a dummy tooling axis with point and line creation commands. With the help of Intersection and plane command the exact tooling axis is created in respect to bisecting method.
• Class B surface has progressed with Extract, Boundary, Extrapolation, and Surface Untrim commands. Final trim and offset are used to create the partbody of 3mm thickness.
• Sufficient fillets are provided with subtracting 2.5 - 3 mm from the Class A surface for proper alignment during final trim.
• Class C surface creation with Boundary, Sweep and trim commands followed with Class A and C join as to trim it with Class B surface for the final product generation.
• After the creation of Class A, B, C surfaces, had started the designing of ribs and screw boss as per given in question.
• Ribs are designed with,
  • Draft - 0.5 deg
  • Thickness - 40% of Wall thickness = 0.4 x 3 = 1.2 mm
  • Height < 5*wall thickness = 5 x 3 = 15mm
  • Minimum thickness at Top = 0.75 mm
  • Fillet = 0.25 mm
• Rib root thickness is measured with tritangent circle creation and is of 3.2 mm with 3 mm of wall thickness. Along with that, Minimum height at top is of 0.968 mm.
• And for Screw boss,
  • W > 0.5T; W need to be greater than 1.5 mm and given of 1.65mm.
  • Height = 3T = 9mm
  • Draft - 0.5 deg
  • Fillet = 0.25 mm
  • Spacing of 3: 1 ratio
• All the designing procedure are properly followed and published all according to time of completion.

IMAGES / SCREENSHOTS

• CLASS A SURFACE

• CLASS B SURFACE

• CLASS C SURFACE

• FINAL PRODUCT

• COMPONENT WITH RIBS AND SCREW BOSSES AS PARTBODY

• FINAL COMPLETE PARTBODY

• DRAFT ANALYSIS

• TREE STRUCTURE

NOTE:

• Positioned sketches are used and are Iso-Constrained
• Proper Tree Structure is maintained
• Geometrical sets are properly named based on the sketches present inside.
• All the sketches are created under the Geometrical set.