Definition
Supported movements define the set of watch movements for which case design systems are developed and validated.
Each movement represents a unique set of geometric and functional constraints.
Why Movement Selection Matters
Watch case design is movement-dependent.
Each movement defines:
- Diameter
- Thickness
- Stem position
- Functional interfaces
Incorrect movement selection results in:
- Misalignment
- Assembly issues
- Incompatible case geometry
Case design must be specific to the movement.
Principle of Movement-Specific Design
Each movement requires:
- A dedicated internal geometry
- A defined tolerance system
- A specific case core
Movements are not interchangeable without redesign.
Core Supported Movements
Sellita SW200-1
Characteristics:
- Diameter: ~25.6 mm
- Height: ~4.6 mm
- Industry-standard Swiss automatic
Used for:
- Primary case core platform
- High-precision case systems
ETA 2824-2
Characteristics:
- Similar architecture to SW200-1
- Compatible dimensional class
Used for:
- Secondary compatibility within same case system
Future Supported Movements
Miyota 9015
Characteristics:
- Different architecture
- Different stem height and tolerances
Requires:
- Dedicated case core system
Seiko NH35
Characteristics:
- Larger diameter
- Different interface geometry
Requires:
- Separate design system
System Context
Each supported movement connects to:
- Movement-specific case cores
- Tolerance systems
- Sealing and structural design
Movement selection defines the entire design pathway.
Final Statement
Watch case design is defined by the movement.
Each supported movement requires a dedicated engineering system, and all case geometry must be derived from its specific constraints.
Related Pages
- Stem height and its impact on case design: /stem-height-impact-case-design/
- Stem height to crown tube position relationship: /stem-height-crown-tube-position-relationship/
- Crown and stem alignment in watch cases: /crown-and-stem-alignment-in-watch-cases/
- Crown tube positioning and geometry: /crown-tube-positioning-geometry/
- Crown tube installation and tolerances: /crown-tube-installation-tolerances/
- Keyless works constraints in case design: /keyless-works-constraints-case-design/
- Keyless works protection and failure modes: /keyless-works-protection-misalignment-failure-modes/
- Internal case geometry constraints: /internal-case-geometry-movement-cavity-sizing/
- Movement holder design: /movement-holder-design/
- Radial clearance between movement and case: /radial-clearance-movement-case/
- Axial retention and movement stack control: /axial-retention-movement-stack-control/
- Common stem misalignment failures: /common-stem-misalignment-failures/
- Assembly constraints in watch case design: /assembly-order-constraints-watch-case-design/
- Design validation checklist: /design-validation-checklist-pre-production/