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Bearing grease calculator: how much and how often
How much grease per top-up (0.005·D·B) and how often to relubricate a rolling bearing, from speed, temperature, contamination and moisture. Free.
- Instant result
- Formula and standards shown
- On desktop and phone
Result
17,667hRelubrication interval
Grease: 3.90 g per point, every 17,667 h
- Quantity per shot
- 3.90g
- Lubricator rate
- 0.0002g/h
- Caution : Starting estimate: adjust it with the grease maker's advice, ultrasound or temperature.
Free during the beta, no credit card
Greasing interval turned into a preventive plan
Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.
The CMMS software comparison, our gaps included- Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
- On the technician's phone, even without a network.
- In the machine's history, for the next breakdown.
- The result becomes a checklist step of the work order.
- The calculated interval creates a preventive maintenance plan.
- The asset's nameplate data pre-fills the calculation.
When to calculate a bearing greasing interval
01
Set up a greasing routine for motors and plummer blocks that have none.
02
Set an automatic lubricator to the right discharge period.
03
Shorten the interval of a hot, damp or dusty bearing rather than greasing the whole plant at the same pace.
Good to know
This is a starting estimate: adjust it with the grease manufacturer's advice, the bearing temperature or ultrasound monitoring. Too much grease heats a bearing as much as too little.
Relubrication interval formula and correction factors
The calculator estimates a bearing's relubrication interval with the formula published by STLE (Leugner), corrected by six factors: temperature, contamination, moisture, vibration, shaft position and bearing type. With the outside diameter and width, it also gives the quantity per top-up (0.005·D·B, SKF's formula) and, for an automatic lubricator, the feed rate and cartridge life.
Formula · Reference documents
tf = K·[14·10⁶/(n·√d) − 4·d], K = Ft·Fc·Fm·Fv·Fp·Fd ; Gp = 0.005·D·B (through the outer ring groove: 0.002·D·B)
STLE, TLT April 2009, fig. 7 and 8 (Leugner) ; SKF, Rolling bearings, Relubrication
Inputs and accepted ranges
| Input | Unit | Accepted range | Example |
|---|---|---|---|
| Bore d | mm | 3 to 1,500 | 25 mm |
| Outside diameter D | mm | 5 to 2,500 | 52 mm |
| Width B | mm | 2 to 600 | 15 mm |
| Speed | rpm | 1 to 100,000 | 1,500 rpm |
| Bearing type | 3 options | Ball | |
| Bearing temperature | °C | -40 to 200 | 40 °C |
| Contamination | 4 options | Light dust | |
| Moisture | 4 options | Humidity under 80% | |
| Peak vibration | mm/s | 0 to 100 | 2 mm/s |
| Shaft position | 3 options | Horizontal | |
| Grease feed | 2 options | From the side | |
| Cartridge volume | cm³ | 1 to 2,000 | Optional |
| Grease density | g/cm³ | 0.5 to 1.5 | Optional |
Calculated results
- Relubrication intervalh
- Quantity per shotg
- Lubricator rateg/h
- Cartridge lifeh
What the calculator flags
- Starting estimate: adjust it with the grease maker's advice, ultrasound or temperature.
- Under 100 rpm: the formula is meant for medium and high speeds.
- High speed factor n·dm: ask the grease manufacturer.
Greasing rounds planned and done from the phone
- Breakdowns reported by QR code
- Work orders on the phone, even without a network
- Mandatory inspections reminded by email
- Audit file as a PDF, in one click
Free during the beta, no credit card