Precision Aluminium Rotor–Coil Housing (High-Speed Experimental Assembly) – CAD + Manufacturing Drawings - 21/02/2026 05:09 EST
Budget: ₹37,500 – ₹75,000 INR
I am developing a compact aluminium cylindrical research assembly that houses a precision central rotor, concentric removable coil formers, permanent magnets, and a small electronics bay.
This is a mechanical design + manufacturing documentation project only. No electrical design or physics modeling is required.
The assembly must be compact, symmetric, serviceable, and suitable for high-speed rotor operation while allowing future coil configuration changes.
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1️⃣ Overall Configuration
Horizontal cylindrical aluminium housing
Central precision rotor on dual angular-contact bearings
Concentric removable coil formers around rotor
Magnet pockets sized for standard 12 × 3 mm NdFeB disc magnets
Internal cable routing channels
Removable electronics mounting plate
Sensor mounting provisions (RPM, vibration, temperature)
Target envelope (baseline — can refine during design):
Outer diameter: 300–340 mm
Overall length: 700–800 mm
Aluminium body material: 6061-T6 / 6082-T6
High-stress parts (if required): 7075-T6
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2️⃣ Design Requirements
Rotor & Bearing System
Dual angular-contact bearing arrangement
Proper bearing seat fits (H7/g6 or equivalent ISO fit system)
Shaft runout ≤ 5 microns at bearing journals
Balanced-friendly design (provision for dynamic balancing)
Air-Gap & Clearance
Defined and consistent rotor-to-coil air-gap (to be finalized during design)
Minimum 5 mm clearance around coils for thermal probes and wiring
No interference at full tolerance stack-up
Magnet Integration
Pockets sized for 12 × 3 mm neodymium discs
Mechanical retention required (lip, cover ring, fastener retention)
Adhesive-only retention is not acceptable
Serviceability
Coil formers must be removable without machining
Electronics plate removable
Access panels must not compromise symmetry
Cable Routing
Clean internal channels
No free-hanging wiring paths
Provision for future vacuum feedthrough if required
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3️⃣ Deliverables Required
A. 3D CAD Model (Full Assembly)
SolidWorks preferred (Fusion 360 acceptable)
Fully parametric
All components modeled (housing, rotor, shaft, bearings, coil formers, fasteners, magnet pockets, electronics plate)
B. 2D Manufacturing Drawings
For all machinable components:
GD&T where required
Bearing fits clearly specified
Surface finish notes
Thread specifications (metric preferred)
Assembly notes
Critical inspection dimensions highlighted
C. Exploded View + BOM
Standard fasteners (ISO metric)
Bearings (select common catalog parts)
Seals / spacers
Simple, locally sourceable components
D. Neutral CAD Exports
STEP
IGES
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4️⃣ Validation Criteria (Acceptance Conditions)
The design will be validated by checking:
Rotor clears stator region with defined air-gap
Magnet cavities match 12 × 3 mm discs precisely
Bearing seats and shaft fits follow correct ISO tolerance classes
≥ 5 mm clearance around coils
Balanced-friendly geometry
Assembly is mechanically symmetric
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5️⃣ Experience Required
Please apply only if you have:
Experience designing rotating machinery or motor housings
Experience designing around strong neodymium magnets
Strong understanding of bearing fits and high-speed tolerances
Ability to produce clean production-ready drawings
When applying, include:
Portfolio examples of similar mechanical assemblies
Software used
Estimated timeline for first draft and final delivery
---
6️⃣ Important Notes
This is a confidential research prototype.
Final operating parameters (speed, electrical excitation) will be disclosed after project award if required for mechanical validation.
The scope is strictly mechanical design and documentation.
---
If you are confident designing compact aluminium assemblies around precision rotors and magnets, I would be glad to discuss further.
Note:- NDA compulsory before any information sharing.
---
This is a mechanical design + manufacturing documentation project only. No electrical design or physics modeling is required.
The assembly must be compact, symmetric, serviceable, and suitable for high-speed rotor operation while allowing future coil configuration changes.
---
1️⃣ Overall Configuration
Horizontal cylindrical aluminium housing
Central precision rotor on dual angular-contact bearings
Concentric removable coil formers around rotor
Magnet pockets sized for standard 12 × 3 mm NdFeB disc magnets
Internal cable routing channels
Removable electronics mounting plate
Sensor mounting provisions (RPM, vibration, temperature)
Target envelope (baseline — can refine during design):
Outer diameter: 300–340 mm
Overall length: 700–800 mm
Aluminium body material: 6061-T6 / 6082-T6
High-stress parts (if required): 7075-T6
---
2️⃣ Design Requirements
Rotor & Bearing System
Dual angular-contact bearing arrangement
Proper bearing seat fits (H7/g6 or equivalent ISO fit system)
Shaft runout ≤ 5 microns at bearing journals
Balanced-friendly design (provision for dynamic balancing)
Air-Gap & Clearance
Defined and consistent rotor-to-coil air-gap (to be finalized during design)
Minimum 5 mm clearance around coils for thermal probes and wiring
No interference at full tolerance stack-up
Magnet Integration
Pockets sized for 12 × 3 mm neodymium discs
Mechanical retention required (lip, cover ring, fastener retention)
Adhesive-only retention is not acceptable
Serviceability
Coil formers must be removable without machining
Electronics plate removable
Access panels must not compromise symmetry
Cable Routing
Clean internal channels
No free-hanging wiring paths
Provision for future vacuum feedthrough if required
---
3️⃣ Deliverables Required
A. 3D CAD Model (Full Assembly)
SolidWorks preferred (Fusion 360 acceptable)
Fully parametric
All components modeled (housing, rotor, shaft, bearings, coil formers, fasteners, magnet pockets, electronics plate)
B. 2D Manufacturing Drawings
For all machinable components:
GD&T where required
Bearing fits clearly specified
Surface finish notes
Thread specifications (metric preferred)
Assembly notes
Critical inspection dimensions highlighted
C. Exploded View + BOM
Standard fasteners (ISO metric)
Bearings (select common catalog parts)
Seals / spacers
Simple, locally sourceable components
D. Neutral CAD Exports
STEP
IGES
---
4️⃣ Validation Criteria (Acceptance Conditions)
The design will be validated by checking:
Rotor clears stator region with defined air-gap
Magnet cavities match 12 × 3 mm discs precisely
Bearing seats and shaft fits follow correct ISO tolerance classes
≥ 5 mm clearance around coils
Balanced-friendly geometry
Assembly is mechanically symmetric
---
5️⃣ Experience Required
Please apply only if you have:
Experience designing rotating machinery or motor housings
Experience designing around strong neodymium magnets
Strong understanding of bearing fits and high-speed tolerances
Ability to produce clean production-ready drawings
When applying, include:
Portfolio examples of similar mechanical assemblies
Software used
Estimated timeline for first draft and final delivery
---
6️⃣ Important Notes
This is a confidential research prototype.
Final operating parameters (speed, electrical excitation) will be disclosed after project award if required for mechanical validation.
The scope is strictly mechanical design and documentation.
---
If you are confident designing compact aluminium assemblies around precision rotors and magnets, I would be glad to discuss further.
Note:- NDA compulsory before any information sharing.
---