FEA-Validated PETG CNC Soft Jaw Fixture (Ø40 mm)
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FEA-validated PETG soft jaw fixture for standard 6-inch CNC vises. Holds Ø40 mm round stock under 2kN clamping load
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# FEA-Validated PETG CNC Soft Jaw Fixture (Ø40 mm Stock)
An open-source, structurally validated 3D-printed PETG soft jaw fixture designed for standard 6-inch CNC machine vise assemblies. Engineered to hold Ø40 mm round stock securely during light milling, drilling, deburring, and inspection operations.
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## Technical Performance & FEA Summary (Rev 2.0 Update)
- Clamping Load Capacity: Evaluated at 2,000 N (2.0 kN) horizontal clamping force across the conformal R20 mm contact arc.
- Peak von Mises Stress: 8.15 MPa (verified in ANSYS Mechanical).
- **Factor of Safety (FOS):** 6.13 relative to PETG tensile yield strength (50 MPa), ensuring robust protection against anisotropic 3D-printing layer separation under vise loading.
- Analysis Status: Mesh-refined static structural simulation complete with verified stress and safety factor contours.
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## Recommended Print Settings (Creality K2 Pro / CoreXY)
- Filament Material: PETG (Generic / Structural)
- Layer Height: 0.20 mm (0.24 mm first layer)
- Wall Loops (Perimeters): 6 loops (2.52 mm solid perimeter boundary)
- Top / Bottom Shells: 5 solid layers
- Infill: 50% Gyroid (isotropic 3D compressive support)
- Nozzle Temperature: 250°C
- Bed Temperature: 80°C (Textured PEI Plate)
- Part Cooling Fan: Capped at 20%–30% max to preserve inter-layer thermal bond strength
- Print Time / Weight: 2 hr 59 min | 92.21 g (30.19 m)
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## Assembly & Fastener Guidance
- Mounting Screws: Dual M10 socket head cap screws (ISO 4762).
- Washers: Always use ISO 7089 flat washers under each M10 head to limit compressive bearing stress.
- Tightening Torque: Limit installation torque to ~5 N·m.
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## Repository Contents & Open Source Licensing
This project is fully documented under open-source hardware standards:
- Hardware Design (.SLDPRT, .STEP, .STL, .3mf): CERN Open Hardware Licence v2 – Strongly Reciprocal (CERN-OHL-S-2.0)
- Documentation (.pdf): Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA-4.0)
OSHWA Certified Open Source Hardware (UID: IN000104)
Official Certification Registry: https://certification.oshwa.org/in000104.html