FORMULA for grease relubrication interval
FORMULA for grease relubrication interval
(OP)
Various manufacturer's publish charts which can be used to determine appropriate grease relubrication interval for rolling bearings. To enter the charts we would normally need speed and bearing dimensions. Also sometimes need a load ratio or a speed ratio (actual/rated).
Are there any formula's which accomplish the same function without need for a chart. I would like to be able to do it in excel (along with calculating grease quantity, whose formula is already known).
Are there any formula's which accomplish the same function without need for a chart. I would like to be able to do it in excel (along with calculating grease quantity, whose formula is already known).
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RE: FORMULA for grease relubrication interval
Go to the following URL,
http://www.lubriquip.com/pdf/20115.pdf
to see the lubriquip/trabon approach to calculation lubricant consumption.
Regards,
Gunnar
RE: FORMULA for grease relubrication interval
RE: FORMULA for grease relubrication interval
I don't believe there is any 'magic formula' that will give you accurate answers because your operating conditions are so variable, as is the quality of both products (i.e the bearings and the grease).
SKF (and others) offer the following formula
Gk = (0.3...0.5) DB x 10^-4
Where Gk = grease qty to be supplied in grammes per hour
D = Outer diameter in mm
B = Width of the bearing in mm
The only way I have seen that a large operation (steelworks) sort out their lubricant question was a concerted and joint effort between the maintenance staff, the bearing suppliers and the lubricant suppliers who all assisted in the monitoring of a specified lubricant over a period of time, under known conditions.
The end savings were huge - but it took a lot of effort, and time.
If you do produce 'the Holy Grail' you'll make a fortune!
Lester Milton
Telford, Shropshire, UK
RE: FORMULA for grease relubrication interval
RE: FORMULA for grease relubrication interval
thx
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