On Friday 30 June 2017 06:13:19 andy pugh wrote: > On 30 June 2017 at 01:35, Gene Heskett <[email protected]> wrote: > > > What oil are you using? Some lathes need very light oil. I run ISO > > > 32 hydraulic oil in the Rivett. (10 wt on the other scale) > > > > Exactly whats in the can, 10w non-detergent for air compressors. > > Seems thick and I may switch to 0w-20 synthetic when this is used > > up. > > Looking further. On the Holbrook list it appears that the manufacturer > specifies ISO 5 oil for the plain bearings. Folk with those lathes use > ISO 5 hydraulic oil. > I can easily find it in 1L quantities in the UK: > https://www.alexoil.co.uk/hydraulic-oil/548-hydraulic-oil-iso-5-1l.htm >l But can't work out how to localise the search to your area. > > (I was initially thinking that 5-wt motorcycle fork oil would be an > easy source, but that appears to be SAE 5wt, so not the same thing at > all.)
Knowing a wee bit, probably enough to be dangerous, about the hydrodynamics involved, those are quite huge bearings to be set at sub thou clearances where the oils viscosity can represent a considerable portion of the drag involved, 10w in those clearances might as well be 90w gear oil. At 2k revs, and no cooling circulation of the oil from a larger oil pan and pump like an IC engine has, theres no way in hell its not going to get hot. Recommendations not withstanding, 10w is too thick IMO. So when that pumper can is empty, it will get refilled with the lightest syn-oil I can locally source. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
