lowest viscosity oil

What't the lowest viscosity oil anyone has come across here? It looks like some of the "spindle" oils get pretty thin. Are they used in a special way?
How low are the clearances those bearings run at?
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On Mon, 4 Jan 2021 06:37:24 +0000 (UTC), Cydrome Leader

You're on the right track with spindle oils -- they're the lowest viscosity oils I'm aware of, other than perhaps special watch/instrument oils. I've used Mobil Velocite #6 in an air over hydraulic system where the thinnest available hydraulic oil limited the speed of the system. Velocite #6 (ISO 10) seems similar in viscosity to kerosene. I've never handled Velocite #3, which is even thinner.
The thinnest spindle oils are probably most commonly used in high speed pre-loaded bearings with oil-mist lubrication.
https://www.mcmaster.com/spindle-oil
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Ned Simmons

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wrote:

where would air tool oil fit into this? BTW, being a ex silly servant who, at one point was resposible for cleaning out a redundant office facility, I have a couple little bottles of "Government of Canada" typewriter oil!
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On 1/3/2021 11:37 PM, Cydrome Leader wrote:

Look at Lilly White sewing machine oil.
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What's so special about sewing machines? I've never torn one part, but know some have an oil filled sump. Not sure about what the moving parts or stresses are on those things.
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On 1/5/2021 11:53 AM, Cydrome Leader wrote:
>> On 1/3/2021 11:37 PM, Cydrome Leader wrote: >>> What't the lowest viscosity oil anyone has come across here? It looks like >>> some of the "spindle" oils get pretty thin. Are they used in a special way? >>> How low are the clearances those bearings run at? >>> >> >> >> Look at Lilly White sewing machine oil. > > What's so special about sewing machines? I've never torn one part, but know > some have an oil filled sump. Not sure about what the moving parts or > stresses are on those things. >
They are fast and use a very low vis oil. As low as ISO22 (on the low end of the SAE10 range) Due to stain potential they prefer very clear oil. Other than that. No clue.
Velocite #10 is an ISO22 also, and there are lighter grades of Velocite spindle oil.
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On 1/5/21 12:53 PM, Cydrome Leader wrote:

They need a very clear, usually vegetable-based, oil that will not stain or leave a permanent mark on fabrics.
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Bob Nichols AT comcast.net I am "RNichols42"

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