Overview of Lubrication and Oil Types

[Clive FosterParticipant @clivefoster55965]

Picked up this link :- **LINK** via another forum. 25 pages worth.

Has what seemed to me to be a fairly nice overview of lubrication fundamentals the difference in oil types and their use on machines. I found the speed / clearance / viscosity coverage of particular interest as I've never had any useful understanding as to what oil to use when. Most texts I've seen being either very application specific, very technically complex or both (wiv extra maths!). The originators main business is in consultancy and training to get the most out of oils in industrial plant applications so rather a lot on cleanliness and filtration. Mostly ho-hum for folks like us.

One thing I hadn't appreciated is that the anti-wear additives in the ISO hydraulic oils often used for general lubrication in our sizes of machine tools are irrelevant for normal rotting shafts, bearings et al. They are included for protection when things start up from rest or come to a stop as the oil film is disrupted at such times. Clearly important for hydraulic rams and the like which tend to do a lot of starting and stopping. Not so much on machines where things are either stopped or spinning for significant periods.

Clive.

[Clive FosterParticipant @clivefoster55965]

[Brian Sweeting 2Participant @briansweeting2]

Looks like a good read, thanks.

[Thor 🇳🇴Participant @thor]

Thanks Clive, pdf downloaded.

Thor

[Neil WyattModerator @neilwyatt]

Posted by Clive Foster on 09/09/2017 16:29:01:

One thing I hadn't appreciated is that the anti-wear additives in the ISO hydraulic oils often used for general lubrication in our sizes of machine tools are irrelevant for normal rotting shafts, bearings et al. They are included for protection when things start up from rest or come to a stop as the oil film is disrupted at such times. Clearly important for hydraulic rams and the like which tend to do a lot of starting and stopping. Not so much on machines where things are either stopped or spinning for significant periods.

Probably good for machine slides though?

[Clive FosterParticipant @clivefoster55965]

AAARGH

"rotting shafts"

AAARGH. Poxy auto spellcheck. I swear it has another go when I post and changes a couple more just to keep my temper up at the red line.

Should be "rotating shafts" of course.

Good point Neil about anti-wear additives and machine slides. Certainly for lathes like mine where it the cross slide is fed by a pump from the apron, Castrol AWS 32 in mine. Although cast iron on cast iron is a bit different to the more proper bearing combinations.

Clive

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