Optimize your typing experience with our Mechanical Switch Calculator. Whether you are designing custom switches, swapping springs, or analyzing actuation curves, this tool helps you determine the precise relationship between force, travel distance, and spring rates.
Mechanical Switch Calculator
Enter at least 3 variables to calculate the missing value.
Mechanical Switch Calculator Formula:
$$F = F_i + (k \times d)$$
Variables:
- Actuation Force (F): The target force required to trigger the switch.
- Initial/Preload Force (Fi): The weight on the spring when the switch is at rest.
- Spring Rate (k): The stiffness of the spring, measured in grams per millimeter of travel.
- Travel Distance (d): The vertical distance compressed from the rest position.
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What is a Mechanical Switch Calculator?
A mechanical switch calculator is a technical tool used by keyboard enthusiasts and engineers to model the physical behavior of mechanical keyswitches. By understanding the linear relationship between force and displacement, users can predict how a specific spring will feel during actuation.
This is crucial for “frankenswitch” building—the process of combining parts from different manufacturers to create a unique tactile or linear experience. It allows you to verify if a spring swap will result in a heavy or light actuation without physical testing.
How to Calculate Mechanical Switch Force (Example):
- Identify the initial preload force (e.g., 35g).
- Find the spring rate provided by the manufacturer (e.g., 10g/mm).
- Determine the actuation travel (typically 2.0mm for standard switches).
- Multiply the rate by distance ($10 \times 2 = 20g$).
- Add the preload to the result ($35 + 20 = 55g$ total actuation force).
Frequently Asked Questions (FAQ):
Is spring rate the same for all switches? No, different manufacturers use different materials and coil densities, resulting in rates ranging from 5g/mm to 20g/mm.
Why is my calculated force slightly off? Real-world switches have friction (stem drag) and tolerances that can add 2-5g of variance from theoretical models.
What is preload force? Preload is the “starting” force. Even at 0mm travel, the spring is slightly compressed inside the switch housing.
Does this work for tactile switches? This calculator models the linear spring component. Tactile “bumps” add a separate force peak not accounted for by basic spring rate formulas.