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Thread: Oil for headstocks ?
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5th April 2012, 04:48 PM #16
oil
I had a closer look at that HENDEY chart . They are recommending SAE 30 oil in the headstock , which is about ISO 90 ?
The oil in it at the moment ( not much ) is rather thinner that that 30 SAE grade and is clear , so my guess is somebody has been running Hyd. oil in it before me .
These lathes were not high speed by todays standards . About 1000 rpm max with the 18 speed version . Mine is 12 speed and slower , but the VFD will speed it up .
MIKE
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5th April 2012 04:48 PM # ADSGoogle Adsense Advertisement
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5th April 2012, 09:25 PM #17Member
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I use hydraulic oil in my gear head lathe.
ISO 68 is approximately equivalent to SAE 30 in viscosity.
A lot of hydraulic pumps are just two gears meshed together so that is what reassured me to use it on the lathe gears.
Dave
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5th April 2012, 11:37 PM #18Senior Member
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I beg to differ, according to my equivalent Viscosity Chart, ISO 68 is equivalent to SAE 20W. The equivalent to SAE 30 is ISO 100. Google is your friend.
http://www.engineeringtoolbox.com/iso-vg-grade-d_1206.html
Chas.Last edited by Chas; 5th April 2012 at 11:53 PM. Reason: Additional information
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9th April 2012, 02:36 PM #19Member
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Interesting.
The viscosity for ISO 68 on the chart I found matches up between 20SAE and 30SAE at 40 degrees celcius.
But SAE specs are measured at 100 degrees celcius.
The viscocity of the castrol AWH 68 is use is 11.1 at 100 deg C.
Meaning it acts like a ISO 100 oil or an SAE 30.
I think in practice for what we are doing with home use lathes then any oil is a lot better than none.
Attached chart.
Viscosity Information
Regards
David
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10th April 2012, 05:50 PM #20Senior Member
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Hello David,
You have just discovered that "oils ain't oils". In the case of Hyspin AWH 68 which has its' viscosity index (VI) extended by the inclusion of VI modifing chemicals; if it were classified under SAE specifications it would be a 20W - 30 multigrade oil. Without the VI improver, you would expect the viscosity of this oil to be around 8.5 cSt @ 100C. The single grade SAE classifications as shown in the chart are based on straight mineral oil sampling.
As your application does not involve combustion temperatures, you should base any comparisons solely between the ISO and the SAE 40 degree C viscosity numbers.
Regards,
Chas.
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10th April 2012, 06:30 PM #21Pink 10EE owner
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I would not worry too much over what oil to put in it....
I would use DTE heavy medium, but only because the mobil distributor is easy to get to and has it in stock...Light red, the colour of choice for the discerning man.
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10th April 2012, 07:09 PM #22Philomath in training
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An ISO 68 seems to be a common sort of 'weight' of oil to use. My understanding is not to use multigrade oils or oils with detergents added (for example engine oils).
That seems to leave either hydraulic oils or oils like the Tonna 68 that I use - sold as a slide way oil the fine print says that it is also suitable for machine tool gear boxes & bearings.
From a lubrication point of view the machines we run are not that sophisticated - not terribly high speed, manually changed gears (which are straight cut and have reasonable clearance), rolling element bearings that although precision units have been basically unchanged in design for many years, usually lightly loaded. There's nothing there that means that only one oil will do, and it's quite likely that any of the major manufacturers will have several oils that will adequately meet the lubrication needs of a typical manual machine tool such as the type we normally have.
Michael
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10th April 2012, 07:49 PM #23The first step towards knowledge is to know that we are ignorant.
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10th April 2012, 08:48 PM #24Pink 10EE owner
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Realistically engine oil would do OK...But hydraulic oil would be cheaper...
I doubt there would be any issues no matter what you use given the machines age...Light red, the colour of choice for the discerning man.
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