What does the calculated force represent?

It is the idealized axial sliding resistance F = p × π × d × L × μ for the stated uniform elastic fit. It is not a guaranteed puller load or peak breakaway force.

What friction coefficient should I use?

Use a coefficient validated for the actual material pair, surface condition, lubricant, contact pressure and whether breakaway or sliding resistance is required. The result is directly proportional to μ.

How can I reduce the removal force?

Heat the outer ring (or housing) to expand it, or cool the shaft. Oil injection through a groove can also create a hydraulic release. Purpose-built bearing pullers distribute the force evenly.

What geometry does the Lamé model require?

Dr must be the actual outer material boundary of the fitted thick ring. Do not substitute the overall outside diameter of an assembled rolling bearing; its outer ring and rolling elements are not a continuous hub around the shaft fit.

Can this result determine bearing reuse?

No. Reuse requires inspection and acceptance criteria from the bearing or machine manufacturer. The force estimate cannot reveal raceway damage, fretting, corrosion, plastic deformation or contamination.

Free Engineering Tool #056

Bearing Removal (Extraction) Force Calculator

Estimate idealized axial sliding resistance for a same-material solid shaft and thick-walled fitted ring. Actual peak extraction force can differ substantially.

Lamé EquationsInterference FitExtraction Force

Nominal Bore d (mm)

Diametral Interference δ (mm, e.g. 0.020)

Contact Length (mm)

Fitted Ring Outer Diameter D_r (mm; ring material boundary)

Friction Coefficient μ (validated breakaway/sliding value)

Young’s Modulus E (GPa; same material for shaft and ring)

Quick presets

Model boundary: same-material isotropic solid shaft and concentric thick-walled ring, uniform elastic interference and constant μ. Real peak extraction may include static breakaway, fretting, corrosion, shoulders, edge effects, misalignment and plasticity; use the component manufacturer’s method for tool sizing.

Results

Idealized Axial Sliding Resistance

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Interface Pressure p

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Ratio d/D_r

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Equivalent tonne-force

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Interface Pressure (Lamé)

Special case for a solid shaft and thick ring of the same isotropic material under the simplified open-ended elastic model:

δ — diametral interference (mm)
d — nominal interface diameter (mm)
D_r — actual outer material boundary of the fitted ring (mm), not overall bearing OD
E — Young’s modulus (MPa)

Removal Force

⚠️ Interpretation: F = pπdLμ is a uniform-contact friction estimate. No universal error band applies; uncertainty in geometry, interference after roughness, μ and interface condition must be evaluated for the actual removal process.

The procedures described on this page were developed and field-tested by the Vibromera team using the Balanset-1A, a portable dual-channel balancer and vibration analyzer for on-site rotor balancing.

Bearing Removal Force Calculator | Lamé Equations | Free Online Tool

Results

Interface Pressure (Lamé)

Removal Force

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