Engineering
Bearing Load Calculator
The calculator creates a transparent preliminary capacity envelope from base load, peak factor, design margin, rated capacity per bearing, component count, availability, efficiency, and loss. It is intended for early comparison, not bearing-life certification.
Peak demand before margin-
Demand including design margin-
Installed rated capacity-
Availability-adjusted capacity-
Delivered capacity after efficiency and loss-
Delivered capacity minus design demand-
Design demand utilization-
Exact required component count-
Whole components required-
Delivered capacity divided by peak demand-
Rated capacity not delivered-
Decision view
Bearing reaction and capacity screen
Bearing reaction and capacity screenApplied shaft load, peak demand, margin-adjusted demand, and delivered bearing capacity are shown as separate engineering quantities.
Exact scenario comparisonDesign margin (%) changes while all other entered assumptions remain constant.
| Design margin (%) | Peak demand before margin | Demand including design margin | Installed rated capacity | Availability-adjusted capacity | Delivered capacity after efficiency and loss | Delivered capacity minus design demand | Design demand utilization | Exact required component count | Whole components required | Delivered capacity divided by peak demand | Rated capacity not delivered |
|---|
Period-by-period detail
bearing design-margin load cases
How to use Bearing Load Calculator
- Use a free-body diagram to resolve actual radial, axial, and moment loads before entering an equivalent base demand.
- Select a peak factor that reflects startup, shock, imbalance, and duty cycle.
- Verify the selected bearing with manufacturer dynamic and static ratings and the required life calculation.
Calculator guide
Understanding Bearing Load Calculator
Bearing selection depends on how real shaft loads become an equivalent design load and how available bearing capacity is derated for duty and losses.
Calculation method
How the calculation works
Screen bearing load and peak factor against entered bearing capacity to display utilization, required units, and reserve. Base load is multiplied by the peak factor and design margin. Installed rating is then reduced by availability, operating efficiency, and loss before capacity margin, utilization, and whole bearing count are calculated.
Shaft model
Interpret the bearing diagram
The visual distinguishes applied load, factored design load, and delivered capacity at the bearing support.
Worked situations
Practical examples
- Two bearings do not automatically split load equally when shaft stiffness and geometry differ.
- A positive capacity margin can coexist with inadequate L10 life at high speed.
- Shock loading may justify a higher peak factor even when average radial load is modest.
Better inputs
Useful tips
- Separate radial and axial load paths before collapsing them into one planning input.
- Use the correct service factor for vibration, contamination, and starts per hour.
- Confirm lubrication, fit, preload, misalignment, and operating temperature.
Before relying on the result
Limitations and common mistakes
- The model does not calculate L10 life, equivalent dynamic load coefficients, contact stress, shaft deflection, or housing stiffness.
- Availability and efficiency are generic derating inputs rather than bearing-standard factors.
- Final selection requires load direction, speed, lubrication, fit, clearance, temperature, and manufacturer data.
Reference
Key terms
- Radial load
- Load acting perpendicular to the shaft axis.
- Axial load
- Thrust load acting along the shaft axis.
- Peak factor
- Multiplier representing transient or shock demand above the base load.
- Capacity margin
- Delivered modeled capacity minus margin-adjusted design load.
Important note
Calculated from the entered values using the displayed engineering relationship. Confirm design values, load cases, safety factors, standards, and field conditions with a qualified professional.
Frequently asked questions
Is delivered capacity the catalog dynamic rating?
No. It is the entered rated capacity after generic derating.
Does required component count mean bearings in parallel?
Only as a simplified capacity screen; real load sharing requires geometry and stiffness analysis.
Can this size a thrust bearing?
Not by itself because axial-load factors and catalog equations are not modeled.
Why retain a design margin after a peak factor?
Peak allowance and uncertainty or reserve address different concerns.