Some mechanisms do not need the same force across the full stroke. Variable force springs are useful when the product requires a changing force curve to match load, position, or user feel.
Common applications
- Sliding and lifting systems with changing load
- Products requiring progressive motion control
- Compact structures where constant force is not ideal
- Custom return mechanisms with position-based force
Key design inputs
- Target force curve and working stroke
- Starting force and ending force
- Load changes at different positions
- Space limits, material, and cycle life
Selection notes
The target force curve should be defined before spring design begins. If only a single force value is provided, the final movement may not match the desired product feel.
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FAQ
When should a variable force spring be selected?
It should be selected when the mechanism needs different force levels at different positions.
Can the force curve be customized?
Yes. The curve can be adjusted based on material, geometry, coil structure, and working stroke.
What makes testing important?
The real load, guide friction, and installation space can change the final movement behavior.