The Sellita SW200-1 Case Core is not a concept.
It is a defined, constrained geometry built for manufacturing.
This page details exactly what is included.
Core Geometry
The system provides a complete internal case structure.
This includes:
- movement seating geometry
- internal case bore
- axial stack framework
- interface surfaces for sealing
All geometry is defined in mm and constrained.
Movement Integration
The movement is not approximated.
The system includes:
- movement envelope integration
- defined radial clearance
- defined axial positioning
This ensures:
- consistent fit
- correct alignment
- repeatable assembly
Stem Axis Definition
The stem axis is defined in 3D space.
Included:
- exact stem height reference
- axis alignment relative to case geometry
- crown tube positioning reference
This removes:
- alignment guesswork
- trial-and-error positioning
Crown Tube Interface
The system includes:
- crown tube position reference
- case hole geometry baseline
- alignment constraints
This ensures:
- correct positioning
- consistent engagement
- reduced wear
Axial Stack Framework
The system defines the vertical structure.
Included:
- movement seat
- dial position baseline
- hand clearance envelope
- crystal position reference
- caseback interface
This prevents:
- interference
- incorrect compression
- assembly issues
Caseback Interface
The caseback interface is defined for sealing.
Included:
- interface geometry
- compression reference
- tolerance-aware stack
This allows:
- controlled gasket compression
- consistent sealing performance
Crystal Interface Reference
The system provides:
- crystal seat reference
- axial positioning guidance
- clearance envelope
This ensures:
- correct hand clearance
- stable crystal retention
Tolerance-Aware Design
The geometry is not nominal-only.
Included:
- defined clearances
- allowance for machining variation
- consideration of assembly tolerance
This reduces:
- production inconsistency
- failure at tolerance extremes
Sectioned Views
Critical interfaces are provided in section.
These show:
- movement fit
- axial stack
- sealing interfaces
- crown alignment
This allows:
- validation
- understanding of constraints
Parametric Structure
The CAD system is structured.
This allows:
- controlled modification
- adaptation to external design
- integration into case concepts
The core remains constrained.
What You Can Build With It
Using this system:
- external case geometry can be developed around a defined core
- movement alignment is maintained
- sealing interfaces remain valid
- design can move directly to prototyping
What Is Not Included
This is not:
- a finished external case design
- aesthetic styling
- rendering geometry
It is the internal system that enables correct design.
Who This Is For
- microbrands developing cases
- designers moving from concept to production
- builders working with the SW200-1
- engineers requiring a defined starting point
Relation to the System
This product implements:
- Watch Movement Dimensions and Case Fit
- Watch Case Tolerances Explained
- Watch Crown and Stem Alignment
- Watch Caseback Design
- Watch Crystal Fit and Gasket Compression
It converts them into usable geometry.