1. APPLICATION CONTEXT: Multi-Part Stainless Fixture Assembly
An aerospace fixture (6.3 × 4.7 in envelope) was traditionally manufactured from eight stainless steel plates, each from 0.3 to 0.5 in thick, then welded into a final assembly.
Total part volume: 28.241 in³
The conventional process required:
- CNC machining of 8 bodies
- Precision fixturing
- Stainless welding
- Post-weld cleanup and dimensional inspection
While structurally effective, this workflow introduced high labor cost, long lead times, weld distortion risk, and tolerance stack-up.
For aerospace production environments, this meant slow iteration and expensive tooling updates.
2. TECHNICAL CONSTRAINTS: Engineering and Manufacturing Challenges
The fixture required:
- Structural rigidity
- Tight dimensional alignment across joined plates
- Repeatability
- ESD-safe handling capability
Eight components meant eight opportunities for dimensional variation. The result: high cost, multi-week lead times, and limited agility.
3. MECHNANO’S APPROACH: Monolithic SLS with PK-ESD
The fixture was redesigned as a single monolithic geometry and produced via Selective Laser Sintering (SLS) using PK-ESD powder.
SLS enables:
- Consistent ESD performance across complex geometries
- Stable conductivity independent of part thickness
- Chemical resistance suitable for repeated solvent exposure
By consolidating eight welded components into one printed structure:
- Welding is eliminated
- Tolerance stack-up and assembly variability are removed
- Inspection complexity is reduced
- Supply chain steps are reduced
Eight parts became one digital file. PK-ESD additionally provides intrinsic electrostatic discharge control throughout the material — not dependent on surface treatments or grounding strategy.
4. DEMONSTRATED PERFORMANCE
| Metric | Stainless Machining + Welding | SLS with PK-ESD |
|---|---|---|
| Part Count | 8 components | 1 monolithic build |
| Direct Labor | 23–37 hours | ~1–2 hours |
| Machine Time | 16–24 hrs CNC | 12–18 hrs unattended |
| Welding Required | Yes | No |
| Tolerance Stack-Up | Yes | Eliminated |
| Estimated Cost | $2,400–$5,000 | $500–$900 |
| Production Cycle | 3–6 weeks | 1–2 days |
| ESD Control | Grounding-dependent | Intrinsic material control |
5. OPERATIONAL IMPACT
Transitioning to SLS with PK-ESD enables:
- Estimated cost reduction: 65–85%
- Lead time reduction: 80–95%
- Rapid tooling iteration
- In-house production capability
- Reduced labor dependency
- Simplified quality control
- Digital inventory instead of physical stock
- Faster NPI cycles
Instead of waiting weeks for machining and welding capacity, fixtures can be produced in days.
6. IDEAL USE CASES
This approach is best suited for:
- Aerospace assembly fixtures
- ESD-sensitive production environments
- Low-to-medium volume tooling
- Complex welded assemblies suitable for consolidation
Less suited for:
- Extreme load-bearing components beyond polymer limits
7. STRATEGIC POSITIONING
Mechnano enables additive manufacturing solutions where part consolidation, dimensional precision, and intrinsic ESD control must coexist without compromise.
In aerospace fixture workflows, this means replacing multi-part machining and welding with monolithic SLS builds that preserve structural integrity, eliminate assembly variability, and deliver functional ESD-safe tooling — all with lead times measured in days instead of weeks.
