Spiral-groove bearing (axial)

Axial load capacity, stiffness, friction torque and power loss for a spiral-groove thrust bearing — a specialist calculation with essentially no free equivalent anywhere.

✓ validated against legacyoriginal: /calculators/e9_3.htm

Length / diameter, L/DDiameter, DmmRelative clearance, ΔR/RSpeed, nrpmDynamic viscosity, ηPa·sStiffness coefficient, S₁Max eccentricity, ε_max

Maximum load, F_max35.8 N

Stiffness, S33.2 N/µm

Friction torque, M0.8527338202541206 N·mm

Friction power, P0.05357884610355809 W

One of the scarce-core calculators: spiral-groove bearing design has no free alternative and very few commercial ones. Migrated with particular care.

Method & references

Narrow-groove (Muijderman) theory for spiral-groove bearings.
The stiffness coefficient S₁ and ε_max come from the groove geometry design charts.

The computation is a literal port of the original client-side JavaScript from /calculators/e9_3.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.