3D CAD Design for Legacy Mark Medallion

Legacy Mark Medallion - CAD Development Specification
This document provides dimensional specifications, architectural requirements, and reference layouts required for CAD development of the Legacy Mark Medallion for MSLA 3D printing production.

1. Overall Envelope
• Outside Diameter: 44.45 mm (1.750 in)
• Total Assembled Thickness: 5.00 mm
• Rope Border Width (radial): 1.80 mm
• Rope Inner Diameter: 40.85 mm
• Target Weight (with SS disc + NFC): 36–38 g

2. Architecture
Two-piece clamshell architecture:
• Front Shell (Cup Geometry)
• Back Insert Shell
• Internal Stainless Steel Disc (304 SS, 3.0 mm thick)
• 25.4 mm recessed NFC (front-mounted)

3. Internal Stainless Steel Disc
• Diameter: 40.85 mm
• Thickness: 3.00 mm
• Tolerance: ±0.05 mm
• Edge break: 0.2 mm chamfer

4. Shell Wall Thickness
• Nominal Resin Wall Thickness: 1.0–1.2 mm
• Minimum allowed: 0.9 mm
• Z-step bonding seat required for shear strength
• Glue gutters: 0.6 mm wide x 0.3 mm deep

5. Alignment & Anti-Rotation
• Primary Key: Triangular pin @ 0° axis
• Secondary Pins: 2 round pins @ 120° spacing
• Bolt circle radius: 18.5 mm
• Corner fillets: ≥0.3 mm

6. NFC Recess (Front Face)
• Diameter: 25.4 mm (1.00 in)
• Depth: 1.5 mm
• Flat bottom surface
• 0.2 mm chamfer at edge

7. Front Face Text Placement
Text to follow circular arc based on polar axis system:
• 0° = Top center
• 90° = Right
• 180° = Bottom
• 270° = Left

Top Arc (Centered at 0°): Primary Title Text
Bottom Arc (Centered at 180°): Edition Text
Raised rope border defines outer visual frame.

8. Surface Finish Requirements
• All cosmetic faces must be free of support marks
• Front face fully cosmetic
• Back seam concealed under rope geometry
• Designed for MSLA resin shrink (0.5–1%)

Reference Diagrams to be provided