Official Answer
Answer
The radial wall width $b$ is a linear multiplier in the load formula $P = (E \cdot b \cdot t^3 \cdot f \cdot N) / (D_m^3 \cdot K)$. While it directly increases the load capacity, a wide radial wall can introduce 'dishing' effects where the cross-section of the spring tilts under load. This non-parallel compression alters the effective mean diameter $D_m$ during the stroke, leading to a progressive (non-linear) spring rate. For high-precision medical devices, the ratio of $b/t$ is kept within a range of 8:1 to 12:1 to maintain linearity. If the wall is too wide, the spring behaves more like a Belleville washer, losing the characteristic soft-rate benefit of the wave design.
